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,
