Distorted video on 1920x1080 monitor with 4K monitor attached

Graphics / Linux Linux
1

I have a HP ZBook Fury 17 G7 with hybrid graphics (Intel and Nvidia) on Debian 11. I have two external monitors, a Dell 24" 1080 (using a DP to HDMI adapter) and a LG 27" 4K hooked up via a HP Thunderdock. I’m using the nvidia-driver package 460.91.03-1 from the Debian non-free repository.

I would like to have three monitors working: laptop display to my left; 4K monitor in front and above it, the 1080 monitor.

This has worked before, broken, worked again and now broken once again. I took the laptop on vacation and when I came back and hooked everything up, the symptoms came back. Nothing was changed otherwise.

IMG-20211217-114303_2

If I enable both the 4K and 1080 monitors, I get the distorted video on the 1080 monitor seen in the image above. If I disable the 4K monitor, the 1080 monitor works. If I disable the 1080 monitor, the 4K monitor works. The laptop display is not affected.

I have tried different DP-to-HDMI adapters. In fact, using two 1080 monitors works fine.

Nothing in /etc/X11/xorg.conf.d/ at the moment, but I have tried several things. It has worked without anything explicitly configured.

$ xrandr
Screen 0: minimum 8 x 8, current 7680 x 2160, maximum 32767 x 32767
eDP1 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 340mm x 190mm
   3840x2160     60.00*+  40.00  
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
HDMI3 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
DP-1-0.1 connected 3840x2160+3840+0 (normal left inverted right x axis y axis) 600mm x 340mm
   3840x2160     60.00*+  30.00  
   2560x1440     59.95  
   1920x1080     60.00    59.94
[...truncated...]
DP-1-0.2 connected (normal left inverted right x axis y axis)
   1920x1080     60.00 +  59.94    50.00  
   1600x900      60.00  
   1280x1024     75.02    60.02
[...truncated...]
DP-1-0 disconnected (normal left inverted right x axis y axis)
DP-1-1 disconnected (normal left inverted right x axis y axis)
DP-1-2 disconnected (normal left inverted right x axis y axis)
DP-1-3 disconnected (normal left inverted right x axis y axis)
DP-1-4 disconnected (normal left inverted right x axis y axis)
DP-1-5 disconnected (normal left inverted right x axis y axis)

$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation CometLake-H GT2 [UHD Graphics] (rev 05)
01:00.0 VGA compatible controller: NVIDIA Corporation TU104GLM [Quadro RTX 5000 Mobile / Max-Q] (rev a1)

$ xrandr --listproviders 
Providers: number : 2
Provider 0: id: 0x49 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 3 outputs: 7 associated providers: 1 name:modesetting
Provider 1: id: 0x2c6 cap: 0x2, Sink Output crtcs: 4 outputs: 8 associated providers: 1 name:NVIDIA-G0

nvidia-bug-report.log.gz (1.3 MB)

2

Please check if this was fixed in a more recent driver, v470 or v495.

3

I pulled 470.86-1 from unstable and ran xrandr xrandr --setprovideroutputsource 1 0 && xrandr --auto. Neither screens turn on.

4

Please create a new nvidia-bug-report.log.

5

nvidia-bug-report.log.gz (1.3 MB)

6

What kind of error is reported when running the xrandr command?

7

Just noticed: when you had the 470 driver installed, the intel driver was used instead of the modesetting driver. Seems that package came with some additional config.

8

xrandr doesn’t report any errors. Return code for both commands are 0. When I run xrandr --output DP-1-0.2 --off, I get my 4K monitor although the Dell monitor is now off of course.

9

Any thoughts on what else I can try?

10

Not really, since that looks like a bug that should have been fixed in driver v455.23.04

  • Fixed a bug that led to display corruption at some resolutions when
    using an NVIDIA-driven display as a PRIME Display Offload sink.

You could mail your nvidia-bug-report.log to linux-bugs[at]nvidia.com referring to that bug for increased attention.