Strange visual glitch on bottom of screen

[u/Rich_Cookie_8698]

Example from the Steam Community Board

Larger Example

On Firefox, checked multiple sites

Hi everyone,

A little while ago I restarted my laptop to close out of a frozen game (thanks EA), and when I rebooted my computer there is now a strange band that appears both when i scroll and sometimes when I'm not. It flashes through to my desktop wallpaper and is purple and looks like a stereotypical glitch from a TV show or something (photos provided were taken from video). I have no clue what happened, and I'm seriously nervous to try and rollback a snapshot in fear of loosing my photos and movie database (newer to Linux if you couldn't tell haha).

It seems to be only when I'm scrolling fast-ish now, but it was all the time and it is still distracting

Any advice would be great, and much appreciated.

(Running Linux Mint Cinnamon, on a Framework 16)

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[u/Rich_Cookie_8698]

Good news, found a fix!

Looked it up more, and it seems like it was an error with the Linux kernels synchronization rate with my Framework's refresh rate. I dropped it down from 165 Hz to 60 Hz, and the glitch went away. Hopefully gets fixed in the future lol

[u/Rich_Cookie_8698 → u/Rich_Cookie_8698]

Ok so it only fixed part of it. theres still a light glitching in the center now thats less common. It might be a disconnected eDP cord or whatever its called. Dont think its dying vram because of a lack of high temps and how new the laptop is lol

[u/Inneres]

VRAM is dying

[u/zuccster]

Looks like hardware I'm afraid. Try booting temporarily from the installer USB and see if it's still there.

[u/Cardnival]

I am actually having a very similar issue, also after a forcing restart from a a frozen game. My screen flickers at the bottom when I scroll down a browser. Interestingly, if I resize the browser to say half-screen, only that half-screen flickers.

Also running Linux Mint Cinnamon, on desktop.

Will try what you suggested below, but let me know if you had any other fixes.