Screen splash when suspend or resume on I+N platform

[Bin Li]

[Summary]
1.when clicking the the "Suspend" from the "shutdown" menu,The screen will refresh and then sleep
2.when resuming ,the desktop in buffer will appear first, and then the lock screen will appear

[Reproduce]
On Intel + Nvidia platform, do suspend and resume.

[Expected result]
1. It should show the screen without splash.

[Actual result]
1. the screen display abnormal after suspend or before resume.

[Additional information]
Kernel Version: 5.10.0-1038-oem
Ubuntu Version: 20.04.2 LTS
Image: Ubuntu Linux 20.04.2
system-manufacturer: LENOVO
Platform: ThinkPad L14, P15v or T14.
Nvidia: 460.91.03-0ubuntu0.20.04.1 or 470.57.02-0ubuntu0.20.04.1

[Bin Li (binli)]

On T14 I used 5.13.0-1009.10 oem kernel and nvidia 470.57.02-0ubuntu0.20.04.1.
I captured the log when doing suspend and resume.

[Bin Li (binli)]

On P15v, I used 5.8.0-44-generic kernel and nvidia 450.102.04-0ubuntu0.20.04.1.
I could also reproduce this issue.

[Daniel van Vugt (vanvugt)]

I wonder if this is related to bug 1923335. That also has an issue with the screen flashing back on when it should be off.

[Bin Li (binli)]

@Daniel,

 Thanks for your feedback, I checked bug 1923335, the description is similar, but it's not a I+N platform, and from my side, when I switch to Power Saving Mode to use Intel, I could not reproduce this issue. Thanks.

[Daniel van Vugt (vanvugt)]

It's likely that "I+N" is not relevant. Only the Intel GPU is used to draw the shell and login screen.

[Daniel van Vugt (vanvugt)]

In case it is relevant:

Please try uninstalling all Nvidia drivers (so you're left with none but nouveau in 'lspci -k') and reboot. Does the problem still happen?

Also is there an option to disable the discrete GPU in the BIOS? What happens if you disable it?

[Bin Li (binli)]

Sorry for reply late, I tried to swith nouveau, but it couldn't enter suspend with X crash.

Jan 07 01:35:30 Drfit3-T-2 /usr/lib/gdm3/gdm-x-session[1744]: (EE)
Jan 07 01:35:30 Drfit3-T-2 /usr/lib/gdm3/gdm-x-session[1744]: Fatal server error:
Jan 07 01:35:30 Drfit3-T-2 /usr/lib/gdm3/gdm-x-session[1744]: (EE) systemd-logind disappeared (stopped/restarted?)
Jan 07 01:35:30 Drfit3-T-2 /usr/lib/gdm3/gdm-x-session[1744]: (EE)
Jan 07 01:35:30 Drfit3-T-2 /usr/lib/gdm3/gdm-x-session[1744]: (EE)
Jan 07 01:35:30 Drfit3-T-2 /usr/lib/gdm3/gdm-x-session[1744]: Please consult the The X.Org Foundation support
Jan 07 01:35:30 Drfit3-T-2 /usr/lib/gdm3/gdm-x-session[1744]: at http://wiki.x.org
Jan 07 01:35:30 Drfit3-T-2 /usr/lib/gdm3/gdm-x-session[1744]: for help.
Jan 07 01:35:30 Drfit3-T-2 /usr/lib/gdm3/gdm-x-session[1744]: (EE) Please also check the log file at "/home/u/.local/share/xorg/Xorg.0.log" for additional information.
Jan 07 01:35:30 Drfit3-T-2 /usr/lib/gdm3/gdm-x-session[1744]: (EE)

[Bin Li (binli)]

When I switch to intel mode with 'prime-select intel' it will won't load nvidia module, and this issue couldn't be reproduced.

And on T14 there are no option to disable the discrete GPU.