USB-C to DisplayPort Adaper still not recognised in Linux kernel 4.19
Clash Royale CLAN TAG#URR8PPP
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I use Ubuntu 18.04 and upgraded to Linux kernel mainline 4.19.2 with ukuu, which purportedly supports DisplayPort alternate mode for USB-C.
alex@gta-65:~$ uname -a
Linux gta-65 4.19.2-041902-generic #201811132032 SMP Tue Nov 13 20:34:19 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Other USB-C devices work fine on this Lenovo X270. However alternate mode doesn't kick in when my generic dongle is inserted, which works fine with a colleague's Windows PC; no events are generated in kern.log & dmesg.
Is there something I need to look into further, or another display-related library I need to update to have this working?
linux kernel usb display displayport
asked Nov 18 at 23:29
Alex van Vucht
262
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up vote
1
down vote
favorite
I use Ubuntu 18.04 and upgraded to Linux kernel mainline 4.19.2 with ukuu, which purportedly supports DisplayPort alternate mode for USB-C.
alex@gta-65:~$ uname -a
Linux gta-65 4.19.2-041902-generic #201811132032 SMP Tue Nov 13 20:34:19 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Other USB-C devices work fine on this Lenovo X270. However alternate mode doesn't kick in when my generic dongle is inserted, which works fine with a colleague's Windows PC; no events are generated in kern.log & dmesg.
Is there something I need to look into further, or another display-related library I need to update to have this working?
linux kernel usb display displayport
asked Nov 18 at 23:29
Alex van Vucht
262
New contributor
Alex van Vucht is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
up vote
1
down vote
favorite
up vote
1
down vote
favorite
I use Ubuntu 18.04 and upgraded to Linux kernel mainline 4.19.2 with ukuu, which purportedly supports DisplayPort alternate mode for USB-C.
alex@gta-65:~$ uname -a
Linux gta-65 4.19.2-041902-generic #201811132032 SMP Tue Nov 13 20:34:19 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Other USB-C devices work fine on this Lenovo X270. However alternate mode doesn't kick in when my generic dongle is inserted, which works fine with a colleague's Windows PC; no events are generated in kern.log & dmesg.
Is there something I need to look into further, or another display-related library I need to update to have this working?
linux kernel usb display displayport
asked Nov 18 at 23:29
Alex van Vucht
262
New contributor
Alex van Vucht is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I use Ubuntu 18.04 and upgraded to Linux kernel mainline 4.19.2 with ukuu, which purportedly supports DisplayPort alternate mode for USB-C.
alex@gta-65:~$ uname -a
Linux gta-65 4.19.2-041902-generic #201811132032 SMP Tue Nov 13 20:34:19 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Other USB-C devices work fine on this Lenovo X270. However alternate mode doesn't kick in when my generic dongle is inserted, which works fine with a colleague's Windows PC; no events are generated in kern.log & dmesg.
Is there something I need to look into further, or another display-related library I need to update to have this working?
linux kernel usb display displayport
linux kernel usb display displayport
asked Nov 18 at 23:29
Alex van Vucht
262
New contributor
Alex van Vucht is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Nov 18 at 23:29
Alex van Vucht
262
New contributor
Alex van Vucht is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Nov 18 at 23:29
Alex van Vucht
262
New contributor
Alex van Vucht is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Nov 18 at 23:29
Alex van Vucht
262
asked Nov 18 at 23:29
Alex van Vucht
262
262
New contributor
Alex van Vucht is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Alex van Vucht is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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1 Answer
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The simplest cause is usually the easiest - the confusing bundle of cables on this hot desk, once untangled, revealed that the DisplayPort cable was not plugged in.
Now, when connected, kern.log tells me:
Nov 19 14:36:02 GTA-65 kernel: [17099.717660] [drm] Reducing the compressed framebuffer size. This may lead to less power savings than a non-reduced-size. Try to increase stolen memory size if available in BIOS.
So Linux kernel 4.19 does support alternate mode for USB-C to Display Port
answered Nov 19 at 3:53
Alex van Vucht
262
New contributor
Alex van Vucht is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
The simplest cause is usually the easiest - the confusing bundle of cables on this hot desk, once untangled, revealed that the DisplayPort cable was not plugged in.
Now, when connected, kern.log tells me:
Nov 19 14:36:02 GTA-65 kernel: [17099.717660] [drm] Reducing the compressed framebuffer size. This may lead to less power savings than a non-reduced-size. Try to increase stolen memory size if available in BIOS.
So Linux kernel 4.19 does support alternate mode for USB-C to Display Port
answered Nov 19 at 3:53
Alex van Vucht
262
New contributor
Alex van Vucht is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
up vote
2
down vote
The simplest cause is usually the easiest - the confusing bundle of cables on this hot desk, once untangled, revealed that the DisplayPort cable was not plugged in.
Now, when connected, kern.log tells me:
Nov 19 14:36:02 GTA-65 kernel: [17099.717660] [drm] Reducing the compressed framebuffer size. This may lead to less power savings than a non-reduced-size. Try to increase stolen memory size if available in BIOS.
So Linux kernel 4.19 does support alternate mode for USB-C to Display Port
answered Nov 19 at 3:53
Alex van Vucht
262
New contributor
Alex van Vucht is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
up vote
2
down vote
up vote
2
down vote
The simplest cause is usually the easiest - the confusing bundle of cables on this hot desk, once untangled, revealed that the DisplayPort cable was not plugged in.
Now, when connected, kern.log tells me:
Nov 19 14:36:02 GTA-65 kernel: [17099.717660] [drm] Reducing the compressed framebuffer size. This may lead to less power savings than a non-reduced-size. Try to increase stolen memory size if available in BIOS.
So Linux kernel 4.19 does support alternate mode for USB-C to Display Port
answered Nov 19 at 3:53
Alex van Vucht
262
New contributor
Alex van Vucht is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
The simplest cause is usually the easiest - the confusing bundle of cables on this hot desk, once untangled, revealed that the DisplayPort cable was not plugged in.
Now, when connected, kern.log tells me:
Nov 19 14:36:02 GTA-65 kernel: [17099.717660] [drm] Reducing the compressed framebuffer size. This may lead to less power savings than a non-reduced-size. Try to increase stolen memory size if available in BIOS.
So Linux kernel 4.19 does support alternate mode for USB-C to Display Port
answered Nov 19 at 3:53
Alex van Vucht
262
New contributor
Alex van Vucht is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered Nov 19 at 3:53
Alex van Vucht
262
New contributor
Alex van Vucht is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered Nov 19 at 3:53
Alex van Vucht
262
answered Nov 19 at 3:53
Alex van Vucht
262
262
New contributor
Alex van Vucht is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Alex van Vucht is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Alex van Vucht is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
Alex van Vucht is a new contributor. Be nice, and check out our Code of Conduct.
Alex van Vucht is a new contributor. Be nice, and check out our Code of Conduct.
Alex van Vucht is a new contributor. Be nice, and check out our Code of Conduct.
Alex van Vucht is a new contributor. Be nice, and check out our Code of Conduct.
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