Bug#994242: resemble video issue on CML-TGP PCH machine
Dear Maintainer,
I've also met this situation on my new comet lake machine,
Celeron G5905 (CML-R) with H510 chipset,
then found this #994242 report.
No visible video after initial boot.
Same drm_WARN_ON and call trace.
Maybe "TGP PCH + CML combo" support related (5.14, 2021 Feb):
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=4b97039e90bf895a7a1db47411079f0cffe395f6
FYI: freedesktop: drm/i915/cml : Add TGP PCH support
https://patchwork.freedesktop.org/patch/410462/
I guess whether 5.10 LTS will merge those patches in the future
will be important for Intel 10/11th gen CPU's iGPU users.
regards,
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