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6.1.23: 0fc6fea41c71 breaks GPD Pocket 3 i915 modesetting

Patch 0fc6fea41c71 drm/i915: Disable DC states for all commits in 6.1.23 (cherry picked from commit 41b4c7fe72b6105a4b49395eea9aa40cef94288d) breaks modesetting on the GPD Pocket 3 [1], a Tigerlake i7-1195G7 Mini-Laptop.

With it applied, upon loading i915 it hangs hard. Hard enough to no longer react to SysRq or output anything via network. The screen goes black (with backlight switched on). The BIOS controlled keys (for keyboard backlight and fan control) still work. 10s power switch also.

With the patch reverted, the boot splash logo appears as it should, booting continues and life is good.

[1] Hardware description GPD Pocket 3: https://wiki.archlinux.org/title/GPD_Pocket_3

Edited by Kurt Garloff
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