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#1 2021-11-27 17:29:54

kt167
Member
Registered: 2021-05-19
Posts: 5

After waking from sleep one screen is blank and no taskbar

Hi,
I have a Arch LTS (5.10.82-1-lts) running on my desktop, with xserver and KDE. I have two screens connected and the system has been working well for over a year. Today, I had put the computer in sleep mode. When I tried to wake it, the screens didn't show and had to force restart. On restart, however, the following happened (and on subsequent reboots):
1) System boots as normal.
2) Login screen shows on both screens.
3) When I enter password and submit, one screen goes off. The other screen shows the wallpaper but there is no taskbar.

I can open terminal and other applications. Could you please suggest a solution for this?
Thanks,
KT.

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#2 2021-11-27 18:03:21

roccobaroccoSC
Member
Registered: 2021-10-04
Posts: 16

Re: After waking from sleep one screen is blank and no taskbar

+1, I have linux 5.15.2-arch1-1 and a Lenovo W520 without any external screens.
After Sleep mode the screen is blank and the power button blinks as if the computer is still sleeping. I can here the cooling fan working but except for this nothing wakes up.
I assume some issue with ACPI and power management.

This does not happen always in my case, but sporadically. Mostly when the machine has been sleeping for a longer time overnight.

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#3 2021-11-28 11:21:16

kt167
Member
Registered: 2021-05-19
Posts: 5

Re: After waking from sleep one screen is blank and no taskbar

While updating system I regularly get the following warnings, wonder if they have something to do with the sleep issue:
WARNING: Possibly missing firmware for module: aic94xx
WARNING: Possibly missing firmware for module: wd719x
WARNING: Possibly missing firmware for module: xhci_pci

By the way, I found out the reason why one screen wasn't showing. For some reason the second monitor was disabled. I went into system settings and enabled it. Both screens are working now. Can anyone point me to the file location where these system settings are stored? Just in case I need to access them through CLI?

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#4 2021-11-28 14:57:10

seth
Member
Registered: 2012-09-03
Posts: 26,665

Re: After waking from sleep one screen is blank and no taskbar

wonder if they have something to do with the sleep issue

No.

For some reason the second monitor was disabled

https://wiki.archlinux.org/title/Multih … _xorg.conf
Though present outputs are by default enabled, so there's a chance your session screws over this - https://wiki.archlinux.org/title/KDE#Un … lution_set

What you see on wakeup is NOT the login screen, but the screenlocker and the entire context sounds like an OpenGL issue (invalid textures) - perhaps related to the locker (so you might want to prevent locking the screen w/ the sleep)
nvidia? => https://download.nvidia.com/XFree86/Lin … ement.html

@roccobaroccoSC, your situation sounds vastly different.
Make sure you can't switch to another VT and see https://01.org/blogs/rzhang/2015/best-p … ate-issues & https://01.org/linuxgraphics/gfx-docs/d … gging.html
Is there a parallel windows installation and did you try the LTS kernel?

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#5 2021-11-28 16:33:35

kt167
Member
Registered: 2021-05-19
Posts: 5

Re: After waking from sleep one screen is blank and no taskbar

Thanks @seth, very informative.

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