[i915][HSW] Haswell-Core-I5-4210U notebook display doesn't flicker only with i915.modeset=0
Submitted by Evgen
Assigned to Intel GFX Bugs mailing list
Created attachment 144383
Demonstration of flickering on right corner of the screen
I have notebook HP Elitebook Folio 1040 G1 which comes with processor Intel i5-4210U.
I have few types of periodic flickering which happens only on Linux (I don't see it on Windows or BIOS).
- If I leave mouse cursor for few seconds, then start to moving it, there's slight flicker (like display brightness changes a little)
- On the top left corner sometimes appears artifacts (see attached video). They mostly reproduceable if you have black panel or window decoration on top.
I tried different distros and DEs:
* Ubuntu MATE 16.04 (kernel 4.4), xUbuntu 18.04 (kernel 4.15 and 5.0), Fedora 30 with GNOME Wayland, KDE Neon with Plasma 5.15 on XOrg.
Each of them suffer from this issue.
I tried different GRUB options: i915.enable_rc6=0 ; i915.enable_psr=0 ; i915.i915_enable_fbc=1.
Also tried all available Refresh Rates (from 40HZ to 120 HZ) and resolutions.
Problem completely stopped at the last measure - i915.modeset=0
For now I can't test external monitor as this notebook only have DisplayPort
It's possible that problem is fixable by replacing display matrix but the fact that on Windows I can't see any artifacts or flickering worries me.
Please tell which additional logs or system info I can provide
**Attachment 144383**, "Demonstration of flickering on right corner of the screen":