xbacklight not working
Clash Royale CLAN TAG#URR8PPP
I have my ASUS X556U with DualBoot between W10 and Debian Jessie, but I need to regulate the brightness.
I've been serching in Google and I found xbacklight, but I have a problem while executing it:
barreeeiroo@Debian-Diego ~> xbacklight -dec 10
No outputs have backlight property
barreeeiroo@Debian-Diego ~>
Then I search in Google more info about the problem, and I found this post, but it causes another problem:
barreeeiroo@Debian-Diego ~>
sudo ln -s /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.0/rtsx_usb_sdmmc.4/leds/mmc0::/brightness /sys/class/backlight
[sudo] password for barreeeiroo:
ln: failed to create symbolic link ‘/sys/class/backlight/brightness’: Operation not permitted
barreeeiroo@Debian-Diego ~>
I've adapted the route to my computer
Then I tried to use chmod
and chown
, but is the same problem.
So, my questions are:
- Is possible to fix that error?
- Is there any other method to manage brightness in Debian?
Thanks
debian display backlight
|
show 4 more comments
I have my ASUS X556U with DualBoot between W10 and Debian Jessie, but I need to regulate the brightness.
I've been serching in Google and I found xbacklight, but I have a problem while executing it:
barreeeiroo@Debian-Diego ~> xbacklight -dec 10
No outputs have backlight property
barreeeiroo@Debian-Diego ~>
Then I search in Google more info about the problem, and I found this post, but it causes another problem:
barreeeiroo@Debian-Diego ~>
sudo ln -s /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.0/rtsx_usb_sdmmc.4/leds/mmc0::/brightness /sys/class/backlight
[sudo] password for barreeeiroo:
ln: failed to create symbolic link ‘/sys/class/backlight/brightness’: Operation not permitted
barreeeiroo@Debian-Diego ~>
I've adapted the route to my computer
Then I tried to use chmod
and chown
, but is the same problem.
So, my questions are:
- Is possible to fix that error?
- Is there any other method to manage brightness in Debian?
Thanks
debian display backlight
If you have "Operation not permitted" onchmod
orchown
make sure to run the commands as root (using e.g.sudo
)
– Anthon
Aug 6 '16 at 11:40
The same @Anthon, not working
– Diego Barreiro
Aug 6 '16 at 11:49
I believexrandr
also has a backlight brightness setting - I think that uses a different mechanism to accomplish it, so maybe you'll have more luck that way? (note that there's a backlight brightness and 'artificial' brightness setting - make sure you have the right one)
– Wyatt8740
Aug 6 '16 at 14:01
So, how to use xrandr in my laptop? @Wyatt8740
– Diego Barreiro
Aug 6 '16 at 14:08
1
in that case as I said run xrandr without args to list outputs.
– Wyatt8740
Aug 7 '16 at 5:03
|
show 4 more comments
I have my ASUS X556U with DualBoot between W10 and Debian Jessie, but I need to regulate the brightness.
I've been serching in Google and I found xbacklight, but I have a problem while executing it:
barreeeiroo@Debian-Diego ~> xbacklight -dec 10
No outputs have backlight property
barreeeiroo@Debian-Diego ~>
Then I search in Google more info about the problem, and I found this post, but it causes another problem:
barreeeiroo@Debian-Diego ~>
sudo ln -s /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.0/rtsx_usb_sdmmc.4/leds/mmc0::/brightness /sys/class/backlight
[sudo] password for barreeeiroo:
ln: failed to create symbolic link ‘/sys/class/backlight/brightness’: Operation not permitted
barreeeiroo@Debian-Diego ~>
I've adapted the route to my computer
Then I tried to use chmod
and chown
, but is the same problem.
So, my questions are:
- Is possible to fix that error?
- Is there any other method to manage brightness in Debian?
Thanks
debian display backlight
I have my ASUS X556U with DualBoot between W10 and Debian Jessie, but I need to regulate the brightness.
I've been serching in Google and I found xbacklight, but I have a problem while executing it:
barreeeiroo@Debian-Diego ~> xbacklight -dec 10
No outputs have backlight property
barreeeiroo@Debian-Diego ~>
Then I search in Google more info about the problem, and I found this post, but it causes another problem:
barreeeiroo@Debian-Diego ~>
sudo ln -s /sys/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5:1.0/rtsx_usb_sdmmc.4/leds/mmc0::/brightness /sys/class/backlight
[sudo] password for barreeeiroo:
ln: failed to create symbolic link ‘/sys/class/backlight/brightness’: Operation not permitted
barreeeiroo@Debian-Diego ~>
I've adapted the route to my computer
Then I tried to use chmod
and chown
, but is the same problem.
So, my questions are:
- Is possible to fix that error?
- Is there any other method to manage brightness in Debian?
Thanks
debian display backlight
debian display backlight
edited Apr 13 '17 at 12:22
Community♦
1
1
asked Aug 6 '16 at 11:20
Diego Barreiro
1613
1613
If you have "Operation not permitted" onchmod
orchown
make sure to run the commands as root (using e.g.sudo
)
– Anthon
Aug 6 '16 at 11:40
The same @Anthon, not working
– Diego Barreiro
Aug 6 '16 at 11:49
I believexrandr
also has a backlight brightness setting - I think that uses a different mechanism to accomplish it, so maybe you'll have more luck that way? (note that there's a backlight brightness and 'artificial' brightness setting - make sure you have the right one)
– Wyatt8740
Aug 6 '16 at 14:01
So, how to use xrandr in my laptop? @Wyatt8740
– Diego Barreiro
Aug 6 '16 at 14:08
1
in that case as I said run xrandr without args to list outputs.
– Wyatt8740
Aug 7 '16 at 5:03
|
show 4 more comments
If you have "Operation not permitted" onchmod
orchown
make sure to run the commands as root (using e.g.sudo
)
– Anthon
Aug 6 '16 at 11:40
The same @Anthon, not working
– Diego Barreiro
Aug 6 '16 at 11:49
I believexrandr
also has a backlight brightness setting - I think that uses a different mechanism to accomplish it, so maybe you'll have more luck that way? (note that there's a backlight brightness and 'artificial' brightness setting - make sure you have the right one)
– Wyatt8740
Aug 6 '16 at 14:01
So, how to use xrandr in my laptop? @Wyatt8740
– Diego Barreiro
Aug 6 '16 at 14:08
1
in that case as I said run xrandr without args to list outputs.
– Wyatt8740
Aug 7 '16 at 5:03
If you have "Operation not permitted" on
chmod
or chown
make sure to run the commands as root (using e.g. sudo
)– Anthon
Aug 6 '16 at 11:40
If you have "Operation not permitted" on
chmod
or chown
make sure to run the commands as root (using e.g. sudo
)– Anthon
Aug 6 '16 at 11:40
The same @Anthon, not working
– Diego Barreiro
Aug 6 '16 at 11:49
The same @Anthon, not working
– Diego Barreiro
Aug 6 '16 at 11:49
I believe
xrandr
also has a backlight brightness setting - I think that uses a different mechanism to accomplish it, so maybe you'll have more luck that way? (note that there's a backlight brightness and 'artificial' brightness setting - make sure you have the right one)– Wyatt8740
Aug 6 '16 at 14:01
I believe
xrandr
also has a backlight brightness setting - I think that uses a different mechanism to accomplish it, so maybe you'll have more luck that way? (note that there's a backlight brightness and 'artificial' brightness setting - make sure you have the right one)– Wyatt8740
Aug 6 '16 at 14:01
So, how to use xrandr in my laptop? @Wyatt8740
– Diego Barreiro
Aug 6 '16 at 14:08
So, how to use xrandr in my laptop? @Wyatt8740
– Diego Barreiro
Aug 6 '16 at 14:08
1
1
in that case as I said run xrandr without args to list outputs.
– Wyatt8740
Aug 7 '16 at 5:03
in that case as I said run xrandr without args to list outputs.
– Wyatt8740
Aug 7 '16 at 5:03
|
show 4 more comments
2 Answers
2
active
oldest
votes
Just managed to control my screen brightness in Debian with xrandr.
xrandr --output [your display] --brightness 0.8
You can find your display name by typing xrandr
- you'll see it as something like "[your display] connected primary 1920x1080..."
Next up... key bindings!
2
According toman xrandr
: “--brightness brightness […] However, this is a software only modification, if your hardware has support to actually change the brightness, you will probably prefer to use xbacklight.”
– Denilson Sá Maia
Jun 26 at 14:47
add a comment |
Arch Linux has the following to say about xbacklight:
Brightness can be set using the xorg-xbacklight package.
Note: xbacklight only works with intel. Radeon does not support the
RandR backlight property. xbacklight currently does not work with the
modesetting driver.
To set brightness to 50% of maximum:
$ xbacklight -set 50
Increments can be used instead of absolute values, for example to
increase or decrease brightness by 10%:$ xbacklight -inc 10
$ xbacklight -dec 10
If you get the "No outputs have backlight property" error, it is
because xrandr/xbacklight does not choose the right directory in
/sys/class/backlight
. You can specify the directory by setting the
Backlight option of the device section inxorg.conf
. For instance, if
the name of the directory isintel_backlight
, the device section can
be configured as follows:/etc/X11/xorg.conf
-------------------
Section "Device"
Identifier "Card0"
Driver "intel"
Option "Backlight" "intel_backlight"
EndSection
The following worked for me on Debian Stretch LXDE.
Checked the backlight directory:
ls /sys/class/backlight
. I happen to haveintel_backlight
.To get the Identifier, I ran
xrandr --verbose
. Mine happened to be0x72
.Checking
/etc/X11/
, I found noxorg.conf
, so I made my own and entered the information I had found:Section "Device"
Identifier "0x72"
Driver "intel"
Option "Backlight" "intel_backlight"
EndSectionI then rebooted. It worked from there.
Since LXDE runs openbox, I edited
~/.config/openbox/lxde-rc.xml
and inserted the following keybindings:<!-- Increase backlight 10% -->
<keybind key="XF86MonBrightnessUp">
<action name="Execute">
<command>xbacklight -inc 10</command>
</action>
</keybind>
<!-- Decrease backlight 10% -->
<keybind key="XF86MonBrightnessDown">
<action name="Execute">
<command>xbacklight -dec 10</command>
</action>
</keybind>
For me the best solution since xrandr could not increase the brightness.
– omisson
Aug 27 at 18:59
add a comment |
Your Answer
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "106"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f301724%2fxbacklight-not-working%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Just managed to control my screen brightness in Debian with xrandr.
xrandr --output [your display] --brightness 0.8
You can find your display name by typing xrandr
- you'll see it as something like "[your display] connected primary 1920x1080..."
Next up... key bindings!
2
According toman xrandr
: “--brightness brightness […] However, this is a software only modification, if your hardware has support to actually change the brightness, you will probably prefer to use xbacklight.”
– Denilson Sá Maia
Jun 26 at 14:47
add a comment |
Just managed to control my screen brightness in Debian with xrandr.
xrandr --output [your display] --brightness 0.8
You can find your display name by typing xrandr
- you'll see it as something like "[your display] connected primary 1920x1080..."
Next up... key bindings!
2
According toman xrandr
: “--brightness brightness […] However, this is a software only modification, if your hardware has support to actually change the brightness, you will probably prefer to use xbacklight.”
– Denilson Sá Maia
Jun 26 at 14:47
add a comment |
Just managed to control my screen brightness in Debian with xrandr.
xrandr --output [your display] --brightness 0.8
You can find your display name by typing xrandr
- you'll see it as something like "[your display] connected primary 1920x1080..."
Next up... key bindings!
Just managed to control my screen brightness in Debian with xrandr.
xrandr --output [your display] --brightness 0.8
You can find your display name by typing xrandr
- you'll see it as something like "[your display] connected primary 1920x1080..."
Next up... key bindings!
answered Jan 29 '17 at 6:01
vickylai
493
493
2
According toman xrandr
: “--brightness brightness […] However, this is a software only modification, if your hardware has support to actually change the brightness, you will probably prefer to use xbacklight.”
– Denilson Sá Maia
Jun 26 at 14:47
add a comment |
2
According toman xrandr
: “--brightness brightness […] However, this is a software only modification, if your hardware has support to actually change the brightness, you will probably prefer to use xbacklight.”
– Denilson Sá Maia
Jun 26 at 14:47
2
2
According to
man xrandr
: “--brightness brightness […] However, this is a software only modification, if your hardware has support to actually change the brightness, you will probably prefer to use xbacklight.”– Denilson Sá Maia
Jun 26 at 14:47
According to
man xrandr
: “--brightness brightness […] However, this is a software only modification, if your hardware has support to actually change the brightness, you will probably prefer to use xbacklight.”– Denilson Sá Maia
Jun 26 at 14:47
add a comment |
Arch Linux has the following to say about xbacklight:
Brightness can be set using the xorg-xbacklight package.
Note: xbacklight only works with intel. Radeon does not support the
RandR backlight property. xbacklight currently does not work with the
modesetting driver.
To set brightness to 50% of maximum:
$ xbacklight -set 50
Increments can be used instead of absolute values, for example to
increase or decrease brightness by 10%:$ xbacklight -inc 10
$ xbacklight -dec 10
If you get the "No outputs have backlight property" error, it is
because xrandr/xbacklight does not choose the right directory in
/sys/class/backlight
. You can specify the directory by setting the
Backlight option of the device section inxorg.conf
. For instance, if
the name of the directory isintel_backlight
, the device section can
be configured as follows:/etc/X11/xorg.conf
-------------------
Section "Device"
Identifier "Card0"
Driver "intel"
Option "Backlight" "intel_backlight"
EndSection
The following worked for me on Debian Stretch LXDE.
Checked the backlight directory:
ls /sys/class/backlight
. I happen to haveintel_backlight
.To get the Identifier, I ran
xrandr --verbose
. Mine happened to be0x72
.Checking
/etc/X11/
, I found noxorg.conf
, so I made my own and entered the information I had found:Section "Device"
Identifier "0x72"
Driver "intel"
Option "Backlight" "intel_backlight"
EndSectionI then rebooted. It worked from there.
Since LXDE runs openbox, I edited
~/.config/openbox/lxde-rc.xml
and inserted the following keybindings:<!-- Increase backlight 10% -->
<keybind key="XF86MonBrightnessUp">
<action name="Execute">
<command>xbacklight -inc 10</command>
</action>
</keybind>
<!-- Decrease backlight 10% -->
<keybind key="XF86MonBrightnessDown">
<action name="Execute">
<command>xbacklight -dec 10</command>
</action>
</keybind>
For me the best solution since xrandr could not increase the brightness.
– omisson
Aug 27 at 18:59
add a comment |
Arch Linux has the following to say about xbacklight:
Brightness can be set using the xorg-xbacklight package.
Note: xbacklight only works with intel. Radeon does not support the
RandR backlight property. xbacklight currently does not work with the
modesetting driver.
To set brightness to 50% of maximum:
$ xbacklight -set 50
Increments can be used instead of absolute values, for example to
increase or decrease brightness by 10%:$ xbacklight -inc 10
$ xbacklight -dec 10
If you get the "No outputs have backlight property" error, it is
because xrandr/xbacklight does not choose the right directory in
/sys/class/backlight
. You can specify the directory by setting the
Backlight option of the device section inxorg.conf
. For instance, if
the name of the directory isintel_backlight
, the device section can
be configured as follows:/etc/X11/xorg.conf
-------------------
Section "Device"
Identifier "Card0"
Driver "intel"
Option "Backlight" "intel_backlight"
EndSection
The following worked for me on Debian Stretch LXDE.
Checked the backlight directory:
ls /sys/class/backlight
. I happen to haveintel_backlight
.To get the Identifier, I ran
xrandr --verbose
. Mine happened to be0x72
.Checking
/etc/X11/
, I found noxorg.conf
, so I made my own and entered the information I had found:Section "Device"
Identifier "0x72"
Driver "intel"
Option "Backlight" "intel_backlight"
EndSectionI then rebooted. It worked from there.
Since LXDE runs openbox, I edited
~/.config/openbox/lxde-rc.xml
and inserted the following keybindings:<!-- Increase backlight 10% -->
<keybind key="XF86MonBrightnessUp">
<action name="Execute">
<command>xbacklight -inc 10</command>
</action>
</keybind>
<!-- Decrease backlight 10% -->
<keybind key="XF86MonBrightnessDown">
<action name="Execute">
<command>xbacklight -dec 10</command>
</action>
</keybind>
For me the best solution since xrandr could not increase the brightness.
– omisson
Aug 27 at 18:59
add a comment |
Arch Linux has the following to say about xbacklight:
Brightness can be set using the xorg-xbacklight package.
Note: xbacklight only works with intel. Radeon does not support the
RandR backlight property. xbacklight currently does not work with the
modesetting driver.
To set brightness to 50% of maximum:
$ xbacklight -set 50
Increments can be used instead of absolute values, for example to
increase or decrease brightness by 10%:$ xbacklight -inc 10
$ xbacklight -dec 10
If you get the "No outputs have backlight property" error, it is
because xrandr/xbacklight does not choose the right directory in
/sys/class/backlight
. You can specify the directory by setting the
Backlight option of the device section inxorg.conf
. For instance, if
the name of the directory isintel_backlight
, the device section can
be configured as follows:/etc/X11/xorg.conf
-------------------
Section "Device"
Identifier "Card0"
Driver "intel"
Option "Backlight" "intel_backlight"
EndSection
The following worked for me on Debian Stretch LXDE.
Checked the backlight directory:
ls /sys/class/backlight
. I happen to haveintel_backlight
.To get the Identifier, I ran
xrandr --verbose
. Mine happened to be0x72
.Checking
/etc/X11/
, I found noxorg.conf
, so I made my own and entered the information I had found:Section "Device"
Identifier "0x72"
Driver "intel"
Option "Backlight" "intel_backlight"
EndSectionI then rebooted. It worked from there.
Since LXDE runs openbox, I edited
~/.config/openbox/lxde-rc.xml
and inserted the following keybindings:<!-- Increase backlight 10% -->
<keybind key="XF86MonBrightnessUp">
<action name="Execute">
<command>xbacklight -inc 10</command>
</action>
</keybind>
<!-- Decrease backlight 10% -->
<keybind key="XF86MonBrightnessDown">
<action name="Execute">
<command>xbacklight -dec 10</command>
</action>
</keybind>
Arch Linux has the following to say about xbacklight:
Brightness can be set using the xorg-xbacklight package.
Note: xbacklight only works with intel. Radeon does not support the
RandR backlight property. xbacklight currently does not work with the
modesetting driver.
To set brightness to 50% of maximum:
$ xbacklight -set 50
Increments can be used instead of absolute values, for example to
increase or decrease brightness by 10%:$ xbacklight -inc 10
$ xbacklight -dec 10
If you get the "No outputs have backlight property" error, it is
because xrandr/xbacklight does not choose the right directory in
/sys/class/backlight
. You can specify the directory by setting the
Backlight option of the device section inxorg.conf
. For instance, if
the name of the directory isintel_backlight
, the device section can
be configured as follows:/etc/X11/xorg.conf
-------------------
Section "Device"
Identifier "Card0"
Driver "intel"
Option "Backlight" "intel_backlight"
EndSection
The following worked for me on Debian Stretch LXDE.
Checked the backlight directory:
ls /sys/class/backlight
. I happen to haveintel_backlight
.To get the Identifier, I ran
xrandr --verbose
. Mine happened to be0x72
.Checking
/etc/X11/
, I found noxorg.conf
, so I made my own and entered the information I had found:Section "Device"
Identifier "0x72"
Driver "intel"
Option "Backlight" "intel_backlight"
EndSectionI then rebooted. It worked from there.
Since LXDE runs openbox, I edited
~/.config/openbox/lxde-rc.xml
and inserted the following keybindings:<!-- Increase backlight 10% -->
<keybind key="XF86MonBrightnessUp">
<action name="Execute">
<command>xbacklight -inc 10</command>
</action>
</keybind>
<!-- Decrease backlight 10% -->
<keybind key="XF86MonBrightnessDown">
<action name="Execute">
<command>xbacklight -dec 10</command>
</action>
</keybind>
edited Dec 19 at 13:10
answered Aug 10 '17 at 2:50
Lorem Ipsum
1736
1736
For me the best solution since xrandr could not increase the brightness.
– omisson
Aug 27 at 18:59
add a comment |
For me the best solution since xrandr could not increase the brightness.
– omisson
Aug 27 at 18:59
For me the best solution since xrandr could not increase the brightness.
– omisson
Aug 27 at 18:59
For me the best solution since xrandr could not increase the brightness.
– omisson
Aug 27 at 18:59
add a comment |
Thanks for contributing an answer to Unix & Linux Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Some of your past answers have not been well-received, and you're in danger of being blocked from answering.
Please pay close attention to the following guidance:
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f301724%2fxbacklight-not-working%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
If you have "Operation not permitted" on
chmod
orchown
make sure to run the commands as root (using e.g.sudo
)– Anthon
Aug 6 '16 at 11:40
The same @Anthon, not working
– Diego Barreiro
Aug 6 '16 at 11:49
I believe
xrandr
also has a backlight brightness setting - I think that uses a different mechanism to accomplish it, so maybe you'll have more luck that way? (note that there's a backlight brightness and 'artificial' brightness setting - make sure you have the right one)– Wyatt8740
Aug 6 '16 at 14:01
So, how to use xrandr in my laptop? @Wyatt8740
– Diego Barreiro
Aug 6 '16 at 14:08
1
in that case as I said run xrandr without args to list outputs.
– Wyatt8740
Aug 7 '16 at 5:03