How can you detect if a USB device is powered via an USB Port?
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I need to power a Raspberry Pi through the USB port of another computer. Is there any way to detect on the PC if the RPi is powered on? Running dmesg as well as lsusb commands on the PC didn't show any meaningful changes. The RPi comes up however so it should draw some current.
usb power-management
asked Aug 11 at 10:38
hid01
112
migrated from unix.stackexchange.com Aug 11 at 16:18
This question came from our site for users of Linux, FreeBSD and other Un*x-like operating systems.
add a comment |Â
up vote
2
down vote
favorite
I need to power a Raspberry Pi through the USB port of another computer. Is there any way to detect on the PC if the RPi is powered on? Running dmesg as well as lsusb commands on the PC didn't show any meaningful changes. The RPi comes up however so it should draw some current.
usb power-management
asked Aug 11 at 10:38
hid01
112
migrated from unix.stackexchange.com Aug 11 at 16:18
This question came from our site for users of Linux, FreeBSD and other Un*x-like operating systems.
Related - unix.stackexchange.com/questions/165447/…
– slm
Aug 11 at 15:13
This question is a tad confusing - to me at least. You want to monitor the on/off state of your RPi from a PC that's supplying power to that RPi. Yet your question implies that you already know the state as you've gotten dmesg and lsusb listings (presumably) from the RPi? I'm sure that's not what you meant, but could you please edit your question to help clarify?
– Seamus
Aug 11 at 19:27
Fixed. dmesg and lsusb where done on the PC powering the RPi. For most USB devices you see when they are attached/detached. But just drawing current seems not to be enough.
– hid01
Aug 11 at 20:02
add a comment |Â
up vote
2
down vote
favorite
up vote
2
down vote
favorite
I need to power a Raspberry Pi through the USB port of another computer. Is there any way to detect on the PC if the RPi is powered on? Running dmesg as well as lsusb commands on the PC didn't show any meaningful changes. The RPi comes up however so it should draw some current.
usb power-management
asked Aug 11 at 10:38
hid01
112
I need to power a Raspberry Pi through the USB port of another computer. Is there any way to detect on the PC if the RPi is powered on? Running dmesg as well as lsusb commands on the PC didn't show any meaningful changes. The RPi comes up however so it should draw some current.
usb power-management
usb power-management
asked Aug 11 at 10:38
hid01
112
asked Aug 11 at 10:38
hid01
112
edited Aug 11 at 20:00
asked Aug 11 at 10:38
hid01
112
asked Aug 11 at 10:38
hid01
112
asked Aug 11 at 10:38
hid01
112
112
migrated from unix.stackexchange.com Aug 11 at 16:18
This question came from our site for users of Linux, FreeBSD and other Un*x-like operating systems.
migrated from unix.stackexchange.com Aug 11 at 16:18
This question came from our site for users of Linux, FreeBSD and other Un*x-like operating systems.
Related - unix.stackexchange.com/questions/165447/…
– slm
Aug 11 at 15:13
This question is a tad confusing - to me at least. You want to monitor the on/off state of your RPi from a PC that's supplying power to that RPi. Yet your question implies that you already know the state as you've gotten dmesg and lsusb listings (presumably) from the RPi? I'm sure that's not what you meant, but could you please edit your question to help clarify?
– Seamus
Aug 11 at 19:27
Fixed. dmesg and lsusb where done on the PC powering the RPi. For most USB devices you see when they are attached/detached. But just drawing current seems not to be enough.
– hid01
Aug 11 at 20:02
add a comment |Â
Related - unix.stackexchange.com/questions/165447/…
– slm
Aug 11 at 15:13
This question is a tad confusing - to me at least. You want to monitor the on/off state of your RPi from a PC that's supplying power to that RPi. Yet your question implies that you already know the state as you've gotten dmesg and lsusb listings (presumably) from the RPi? I'm sure that's not what you meant, but could you please edit your question to help clarify?
– Seamus
Aug 11 at 19:27
Fixed. dmesg and lsusb where done on the PC powering the RPi. For most USB devices you see when they are attached/detached. But just drawing current seems not to be enough.
– hid01
Aug 11 at 20:02
Related - unix.stackexchange.com/questions/165447/…
– slm
Aug 11 at 15:13
Related - unix.stackexchange.com/questions/165447/…
– slm
Aug 11 at 15:13
This question is a tad confusing - to me at least. You want to monitor the on/off state of your RPi from a PC that's supplying power to that RPi. Yet your question implies that you already know the state as you've gotten dmesg and lsusb listings (presumably) from the RPi? I'm sure that's not what you meant, but could you please edit your question to help clarify?
– Seamus
Aug 11 at 19:27
This question is a tad confusing - to me at least. You want to monitor the on/off state of your RPi from a PC that's supplying power to that RPi. Yet your question implies that you already know the state as you've gotten dmesg and lsusb listings (presumably) from the RPi? I'm sure that's not what you meant, but could you please edit your question to help clarify?
– Seamus
Aug 11 at 19:27
Fixed. dmesg and lsusb where done on the PC powering the RPi. For most USB devices you see when they are attached/detached. But just drawing current seems not to be enough.
– hid01
Aug 11 at 20:02
Fixed. dmesg and lsusb where done on the PC powering the RPi. For most USB devices you see when they are attached/detached. But just drawing current seems not to be enough.
– hid01
Aug 11 at 20:02
add a comment |Â
2 Answers
2
active
oldest
votes
up vote
1
down vote
With lsusb, this is the output from my USB mouse:
$ lsusb -v -d VVVV:DDDD
...
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 100mA
...
Device Status: 0x0000
(Bus Powered)
Specifically the Raspberry will always be powered on. At least the Raspberry I have doesn't have an power off switch, so as soon as it is connected to USB power, it will always be powered up.
answered Aug 11 at 15:07
RalfFriedl
25415
Op said they tried that.
– slm
Aug 11 at 15:10
add a comment |Â
up vote
-1
down vote
There is / was an Windows (?) application which would monitor the sharing of data bandwidth on particular USB hub.This app would dynamically allocate data bandwidth to each USB device connected, If it still exists it could give you an indication that the RPi port is passing data hence has power. Again, on Windows , there is /was a way to check each active device "max power". That is part of USB device parameters coded in each USB device hardware.I cannot recall real tech name for these parameters.
Of course that does not tell if the PC port is actually suppling any power.
Logically - if the PC can check battery state on wireless mouse it should be reading the USB port power consumption and the user should be able to retrieve it.
But logic sometimes does not apply.
answered Aug 11 at 19:40
Jan Hus
3091315
add a comment |Â
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
1
down vote
With lsusb, this is the output from my USB mouse:
$ lsusb -v -d VVVV:DDDD
...
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 100mA
...
Device Status: 0x0000
(Bus Powered)
Specifically the Raspberry will always be powered on. At least the Raspberry I have doesn't have an power off switch, so as soon as it is connected to USB power, it will always be powered up.
answered Aug 11 at 15:07
RalfFriedl
25415
Op said they tried that.
– slm
Aug 11 at 15:10
add a comment |Â
up vote
1
down vote
With lsusb, this is the output from my USB mouse:
$ lsusb -v -d VVVV:DDDD
...
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 100mA
...
Device Status: 0x0000
(Bus Powered)
Specifically the Raspberry will always be powered on. At least the Raspberry I have doesn't have an power off switch, so as soon as it is connected to USB power, it will always be powered up.
answered Aug 11 at 15:07
RalfFriedl
25415
Op said they tried that.
– slm
Aug 11 at 15:10
add a comment |Â
up vote
1
down vote
up vote
1
down vote
With lsusb, this is the output from my USB mouse:
$ lsusb -v -d VVVV:DDDD
...
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 100mA
...
Device Status: 0x0000
(Bus Powered)
Specifically the Raspberry will always be powered on. At least the Raspberry I have doesn't have an power off switch, so as soon as it is connected to USB power, it will always be powered up.
answered Aug 11 at 15:07
RalfFriedl
25415
With lsusb, this is the output from my USB mouse:
$ lsusb -v -d VVVV:DDDD
...
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 100mA
...
Device Status: 0x0000
(Bus Powered)
Specifically the Raspberry will always be powered on. At least the Raspberry I have doesn't have an power off switch, so as soon as it is connected to USB power, it will always be powered up.
answered Aug 11 at 15:07
RalfFriedl
25415
answered Aug 11 at 15:07
RalfFriedl
25415
answered Aug 11 at 15:07
RalfFriedl
25415
answered Aug 11 at 15:07
RalfFriedl
25415
25415
Op said they tried that.
– slm
Aug 11 at 15:10
add a comment |Â
Op said they tried that.
– slm
Aug 11 at 15:10
Op said they tried that.
– slm
Aug 11 at 15:10
Op said they tried that.
– slm
Aug 11 at 15:10
add a comment |Â
up vote
-1
down vote
There is / was an Windows (?) application which would monitor the sharing of data bandwidth on particular USB hub.This app would dynamically allocate data bandwidth to each USB device connected, If it still exists it could give you an indication that the RPi port is passing data hence has power. Again, on Windows , there is /was a way to check each active device "max power". That is part of USB device parameters coded in each USB device hardware.I cannot recall real tech name for these parameters.
Of course that does not tell if the PC port is actually suppling any power.
Logically - if the PC can check battery state on wireless mouse it should be reading the USB port power consumption and the user should be able to retrieve it.
But logic sometimes does not apply.
answered Aug 11 at 19:40
Jan Hus
3091315
add a comment |Â
up vote
-1
down vote
There is / was an Windows (?) application which would monitor the sharing of data bandwidth on particular USB hub.This app would dynamically allocate data bandwidth to each USB device connected, If it still exists it could give you an indication that the RPi port is passing data hence has power. Again, on Windows , there is /was a way to check each active device "max power". That is part of USB device parameters coded in each USB device hardware.I cannot recall real tech name for these parameters.
Of course that does not tell if the PC port is actually suppling any power.
Logically - if the PC can check battery state on wireless mouse it should be reading the USB port power consumption and the user should be able to retrieve it.
But logic sometimes does not apply.
answered Aug 11 at 19:40
Jan Hus
3091315
add a comment |Â
up vote
-1
down vote
up vote
-1
down vote
There is / was an Windows (?) application which would monitor the sharing of data bandwidth on particular USB hub.This app would dynamically allocate data bandwidth to each USB device connected, If it still exists it could give you an indication that the RPi port is passing data hence has power. Again, on Windows , there is /was a way to check each active device "max power". That is part of USB device parameters coded in each USB device hardware.I cannot recall real tech name for these parameters.
Of course that does not tell if the PC port is actually suppling any power.
Logically - if the PC can check battery state on wireless mouse it should be reading the USB port power consumption and the user should be able to retrieve it.
But logic sometimes does not apply.
answered Aug 11 at 19:40
Jan Hus
3091315
There is / was an Windows (?) application which would monitor the sharing of data bandwidth on particular USB hub.This app would dynamically allocate data bandwidth to each USB device connected, If it still exists it could give you an indication that the RPi port is passing data hence has power. Again, on Windows , there is /was a way to check each active device "max power". That is part of USB device parameters coded in each USB device hardware.I cannot recall real tech name for these parameters.
Of course that does not tell if the PC port is actually suppling any power.
Logically - if the PC can check battery state on wireless mouse it should be reading the USB port power consumption and the user should be able to retrieve it.
But logic sometimes does not apply.
answered Aug 11 at 19:40
Jan Hus
3091315
answered Aug 11 at 19:40
Jan Hus
3091315
answered Aug 11 at 19:40
Jan Hus
3091315
answered Aug 11 at 19:40
Jan Hus
3091315
3091315
add a comment |Â
add a comment |Â
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Related - unix.stackexchange.com/questions/165447/…
– slm
Aug 11 at 15:13
This question is a tad confusing - to me at least. You want to monitor the on/off state of your RPi from a PC that's supplying power to that RPi. Yet your question implies that you already know the state as you've gotten dmesg and lsusb listings (presumably) from the RPi? I'm sure that's not what you meant, but could you please edit your question to help clarify?
– Seamus
Aug 11 at 19:27
Fixed. dmesg and lsusb where done on the PC powering the RPi. For most USB devices you see when they are attached/detached. But just drawing current seems not to be enough.
– hid01
Aug 11 at 20:02