On 2022-01-25 11:28:14 +0100, Yves-Alexis Perez wrote:
> I guess it is, yes. Could you try without that Xorg configuration, to be sure?
> I'm not really familiar with the NVIDIA driver configuration file (in my case
> I'm using the XRandr configuration using Xfce display profiles) so maybe
> there's indeed something fishy here.
If I comment out the
Option "metamodes" "DP-3: nvidia-auto-select +0+0, DP-4: nvidia-auto-select
+0+0"
line, then, based on 2 tests, both the laptop screen and the right
4K monitor are enabled, with the laptop screen on the left and the
right 4K monitor on the right (so, not a mirror mode). The greeter
correctly appears, and when I move the mouse pointer from one
screen to the other one, the greeter switches to where the mouse
pointer goes. So it is working correctly in this case. However,
when I log in then log out, I get the following error in Xorg.0.log
(I had already noticed this issue in the past, and that's probably
why I added an explicit Xorg monitor configuration):
[ 83.150] (WW) NVIDIA(0): No valid modes for
[ 83.150] (WW) NVIDIA(0):
"DFP-3:nvidia-auto-select,DFP-4:nvidia-auto-select,DFP-5:nvidia-auto-select";
[ 83.150] (WW) NVIDIA(0): removing.
[ 83.150] (WW) NVIDIA(0):
[ 83.150] (WW) NVIDIA(0): Unable to validate any modes; falling back to the
default mode
[ 83.150] (WW) NVIDIA(0): "nvidia-auto-select".
[ 83.150] (WW) NVIDIA(0):
[ 83.151] (WW) NVIDIA(0): No valid modes for
[ 83.151] (WW) NVIDIA(0):
"DFP-3:nvidia-auto-select,DFP-4:nvidia-auto-select,DFP-5:nvidia-auto-select";
[ 83.151] (WW) NVIDIA(0): removing.
[ 83.151] (EE) NVIDIA(0): Unable to use default mode "nvidia-auto-select".
[ 83.151] (EE) NVIDIA(0): Failing initialization of X screen 0
[ 83.719] (II) UnloadModule: "nvidia"
[ 83.719] (II) UnloadSubModule: "wfb"
[ 83.719] (II) UnloadSubModule: "fb"
[ 83.719] (EE) Screen(s) found, but none have a usable configuration.
[ 83.719] (EE)
Fatal server error:
[ 83.719] (EE) no screens found(EE)
[ 83.719] (EE)
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
[ 83.719] (EE) Please also check the log file at "/var/log/Xorg.0.log" for
additional information.
[ 83.719] (EE)
[ 83.758] (EE) Server terminated with error (1). Closing log file.
Indeed, the driver cannot handle 3 monitors.
With the mirror mode, if lightdm thinks that it is in a left/right
configuration, perhaps the greeter is displayed on the right side,
while only the left side is visible.
--
Vincent Lefèvre <vinc...@vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
