apport information
** Tags added: apport-collected focal
** Description changed:
- When connecting a 4k monitor to the DP port of a Lenovo TBT3 Gen2 dock
- and dock is connected to a P17 also with a 4k display if you change the
- scale to 100% and attempt to run any window based application like
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Title:
Garbage window on external 4k display
Status in linux
Can you please attach output of `grep . /sys/class/drm/*/enabled`,
thanks!
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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it prints the word enabled one time
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Title:
Garbage window on external 4k display
Status in linux package in Ubuntu:
Incomplete
it show that this bug is in an incomplete state, I was one of the people
how discovered it, let me know how I can help.
I can provide diagnostics, whatever might be missing if needed to narrow
it down.
I am seeing this issue with latest LTS version (20.04.2), and primarily
usign the Yaru theme.
David, please still paste the full output here.
Also, use a newer kernel like `apt install linux-oem-20.04b` may help.
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Title:
Garb
I updated to the latest OEM kernel 5.6.0-1050-oem from 5.6.0-1035-oem and the
latest nvidia 460 from 455 and the issue appears to be resolved as I can no
longer reproduce the issue. I will ask the end user to also upgrade and retest
to see if the stock image which it appears he is using can als
Note: Looks like the newer kernel and Nvidia driver has an issue that
the external monitor is not seen on the dock after a suspend resume.
You have to disconnect and reconnect the DP cable to get the external
screen back up
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I was mistaken the issue is still there, it is most easily reproduced if
you run youtube.com using Firefox on the external display moving the
mouse over videos displays the window with garbage quite easily.
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I guess is that the TBT output is routed to Nvidia GFX instead of Intel GFX.
But we need the output for comment #20 to confirm.
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Title
As I stated before the full output is the word
enabled
If you are expecting more please verify the command you are requesting
info from
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It works on my system.
$ grep . /sys/class/drm/*/enabled
/sys/class/drm/card0-DP-1/enabled:disabled
/sys/class/drm/card0-DP-2/enabled:disabled
/sys/class/drm/card0-DP-4/enabled:enabled
/sys/class/drm/card0-DP-5/enabled:disabled
/sys/class/drm/card0-DP-6/enabled:disabled
/sys/class/drm/card0-eDP-1/
I looked in the subdirectories of the directory /sys/class/drm and the
file enabled only appears in card0-eDP-1 which would explain the output
from the command.
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contents of /sys/class/drm
lrwxrwxrwx 1 root root0 Mar 25 13:16 card0 ->
../../devices/pci:00/:00:02.0/drm/card0
lrwxrwxrwx 1 root root0 Mar 25 13:16 card0-eDP-1 ->
../../devices/pci:00/:00:02.0/drm/card0/card0-eDP-1
lrwxrwxrwx 1 root root0 Mar 25 13:16 card1 ->
../.
That means the output is routed to Nvidia GFX, and we need their help :)
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Title:
Garbage window on external 4k display
Status in li
Hi Kai-Heng, Jason,
Did you report the issue to NV bugzilla? Can you please tell us the
latest status? Thanks.
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Title:
Garbage wind
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