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For some unknown reason GPU sometimes hangs, so Desktop environment stops working.
1) The problem can be reproduced by issuing a software reboot in loop.
After 5-20 cycles, the GPU hangs at boot when video server is initialized, and and the following error message appears in dmesg:
i915 0000:00:02.0: GPU HANG: ecode 12:1:0x00000000, stopped heartbeat on rcs0
i915 0000:00:02.0: Resetting rcs0 for stopped heartbeat on rcs0 [drm:gen8_reset_engines [i915]] ERROR rcs0 reset request timed out: {request: 00000001, RESET_CTL: 00000001}
As a result, nothing will be displayed on connected display until next reboot/power_cycle.
Logs are attached.
2) The problem can be easily reproduced both with X and Wayland.
3) There are a lot of similar issues with Intel Graphics all over Internet:
- both for Tiger Lake:
https://gitlab.freedesktop.org/mesa/mesa/-/issues/4025
https://gitlab.freedesktop.org/drm/intel/-/issues/3109
https://mesa-ci.01.org/kusma/builds/19/results/8302360
http://198.175.88.100/lepton/builds/5/results/8502129
https://uonfu.com/q/intel/compute-runtime/395/755414054
- and for other Intel chips:
https://gitlab.freedesktop.org/drm/intel/-/issues/161
https://gitlab.freedesktop.org/drm/intel/-/issues/487
https://gitlab.freedesktop.org/drm/intel/-/issues/673
Note: some of these threads for non-Tiger-Lake GPUs contain fixes for this issue. But when we checked the sources of our kernel, we discovered that it already contains all of them. And other advices from that discussions have not helped either.
4) Moreover there are a lot of open bugs, which are related to graphics on Tiger Lake on Intel bugzilla. Moreover some of them lead to GPU hanging:
Configuration:
- Intel Yocto BSP for Tiger Lake (MR2):
x 5.4.106-intel-ese-standard-lts kernel;
x xf86-video-intel-2.99.917+git0+f66d39544b-r0
x libdrm2-2.4+git0+991e95fd13-r0
x libdrm-intel1-2.4+git0+991e95fd13-r0
x xserver-xorg-1.20.8-r0
x wayland-1.18.0-r0
- tried different Tiger Lake boards with the following CPUs:
x i5-1145G7E
x i7-1185G7E
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Hello, @Gennady:
Thank you for contacting Intel Embedded Community.
We sent an email to the address associated with this account with suggestions that may help you.
Best regards,
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