Ubuntu 19.10: Screen flickering after wake-up from sleep

Question

Issue:

Screen starts flickering whenever my laptop wakes up after a sleep or blank screen.

Steps to reproduce:

Let your laptop go to sleep or let its display turn blank.
After wake-up, the display starts flickering.

My machine:

I am using ASUS FX505DT which has KDE and i3wm installed.
PS: I also used to face this issue on my previous Ubuntu 19.10 install with Unity.

Specifications:
Processor: AMD® Ryzen™ 5 3550H Processor
Graphics Card: AMD Vega 8 Graphics Card
Graphics Card: NVIDIA® GeForce® GTX 1650 , with 4GB GDDR5 VRAM

I know this question might seem like a duplicate of Ubuntu 16.10 screen flicker after monitor wake up, but I'm still posting this question because no solution or workaround are fixing this for me.

Update 1: I have funneled down the cause for this issue. It seems to happen only after my laptop wakes up from being suspended.
Update 2: I can also trigger this bug by switching my display mode from 120Hz to 48Hz. The screen starts flickering as soon as I switch to 48Hz. Reverting back stops the flickering.

Include system specs into the body of your message: use "edit". — vanadium, Dec 29 '19 at 12:01
@heynnema I haven't installed nvidia drivers yet so it only uses the AMD GPU. — Utkarsh Verma, Dec 30 '19 at 00:42
Find version 430.09 at https://www.geforce.com/drivers Try them and report back. — heynnema, Dec 30 '19 at 01:50
@heynnema I installed the drivers and had my X server configured by the installer, but after a reboot, Kubuntu got stuck at a black screen before showing the login screen. I uninstalled nvidia using a virtual console which was accessible. — Utkarsh Verma, Dec 30 '19 at 04:22
@UtkarshVerma Yes...why would you try and switch to such a strange frequency? — heynnema, Dec 30 '19 at 09:05
@heynnema KDE provides two frequencies for my display in the settings, 48Hz and 120Hz, so I just toggled the frequency. — Utkarsh Verma, Dec 30 '19 at 09:19
@UtkarshVerma well... don't do that. If you leave it set at 120hz, does your original problem go away? — heynnema, Dec 30 '19 at 09:21
@heynnema No, the issue of getting flickering screen after wake up is still there. — Utkarsh Verma, Dec 30 '19 at 10:02
@UtkarshVerma I'd reinstall the Nividia drivers and try and troubleshoot why they didn't work for you... then you can try the Nvidia card and eliminate the AMD card/driver as a source of your problem. There's plenty of posts here about Nivdia for you to research. — heynnema, Dec 30 '19 at 14:57
Okay, I'll try to get the nvidia drivers working, though I'm pretty sure this is going to be my third attempt to get them working. I'll update back in a few days. — Utkarsh Verma, Dec 30 '19 at 16:12

plusran · Answer 1 · 2021-11-06T00:56:13.287

0

I have the identical problem, amd cpu and gpu, but on PC. it only flickers after waking from sleep, and then I can stop it by reducing the refresh rate [to 100hz]. But if I put the refresh rate back to 144, it flickers.

edit: 3900x and 5700xt with a freesync ultrawide monitor at 1080p.

changing kde plasma to 100hz stops flickering, though the monitor can do 144 before suspending. after waking from a suspend, it will flicker at 144hz

edited Nov 06 '21 at 00:56

answered Nov 05 '21 at 20:06

plusran

11
2

Reducing to what value? [edit[ your answer and update. – Greenonline Nov 05 '21 at 22:48

Ubuntu 19.10: Screen flickering after wake-up from sleep

Issue:

Steps to reproduce:

My machine:

1 Answers1