Ubuntu
linux package

  1. Lunar (23.04)
  2. Bug #1958191
  3. Comment #30

Comment 30 for bug 1958191

Revision history for this message
David Bellot (david-bellot) wrote (last edit ): Re: [i915] Screen flickering in Ubuntu 22.04 (until i915.enable_dc=0 intel_idle.max_cstate=2 are added)

Half-related to this bug but worth mentioning it because it is certainly linked to it. On a HP x360 Spectre (i7-8565U WhiskeyLake-U GT2 [UHD Graphics 620]), the trick with GRUB_CMDLINE_LINUX_DEFAULT.

The problem is more serious here because the screen flickers and goes to black, purple, green, entirely, immediately after the boot (so basically when the kernel presumably changes the graphics mode)

I tried different kernels:
- 5.17.8: failed
- 5.15.x: all failed (from Ubuntu 22.04)
- 5.13.19: works and back to normal

I found the following errors in the logs:
* i915 0000:00:02.0: [drm] *ERROR* Atomic update failure on pipe A (start=43426 end=43427) time 300 us, min 2146, max 2159, scanline start 2131, end 2171
* i915 0000:00:02.0: [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin (v1.4)
* i915 0000:00:02.0: [drm] [ENCODER:102:DDI B/PHY B] is disabled/in DSI mode with an ungated DDI clock, gate it
* i915 0000:00:02.0: [drm] [ENCODER:113:DDI C/PHY C] is disabled/in DSI mode with an ungated DDI clock, gate it
* i915 0000:00:02.0: [drm] *ERROR* CPU pipe A FIFO underrun

So the problem is > 5.13.x series

I solved it by downgrading to 5.13.19 from ubuntu mainline on a newly updated ubuntu 22.04!