Hello. On Fri, May 14, 2021 at 10:24:26AM +0200, Thomas Stein wrote: > After upgrading to linux 5.12 the display on my X1 Carbon Gen 2 starts to > flicker. Well actually it seems to turn off and on again and again. Here a > link to a video a person posted who has the same issue as me obviousely. https://linuxove.com/thinkpad-x1-carbon-gen-3-display-flickering-on-linux-kernel-5-12/ > > This happens without having Xorg running too. So it can't be related to > Xorg. The kernel boots and after a few seconds, the kernel messages scoll > through, the flickering starts. Nothing special in dmesg. > > dmesg: > > himbeere@rather ~ $ dmesg | grep i915 > [ 0.713595] i915 0000:00:02.0: vgaarb: deactivate vga console > [ 0.720280] i915 0000:00:02.0: vgaarb: changed VGA decodes: > olddecodes=io+mem,decodes=io+mem:owns=io+mem > [ 0.741494] i915 0000:00:02.0: [drm] Panel advertises DPCD backlight > support, but VBT disagrees. If your backlight controls don't work try > booting with i915.enable_dpcd_backlight=1. If your machine needs this, > please file a _new_ bug report on drm/i915, see > https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs for > details. > [ 1.864837] [drm] Initialized i915 1.6.0 20201103 for 0000:00:02.0 on > minor 0 > [ 1.875907] fbcon: i915drmfb (fb0) is primary device > [ 3.158255] i915 0000:00:02.0: [drm] fb0: i915drmfb frame buffer device > himbeere@rather ~ $ > > Downgrading to 5.11 solves the issue for me. Any ideas? Does [1] fix your issue? [1] https://cgit.freedesktop.org/drm-tip/patch/?id=acca7762eb71bc05a8f28d29320d193150051f79 -- Oleksandr Natalenko (post-factum)
