[Bug 101619] [SKL] DPCD backlight causes black screen on ThinkPad X1 Carbon 4th Gen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101619

--- Comment #9 from David Weinehall <david.weinehall at intel.com> ---
The new patch sadly doesn't work either. I added a debug statement to print

panel->backlight.max and intel_dp_aux_get_backlight(connector);

max is 0xFFFF, the backlight value is 0x200 (suspiciously low compared to the
max value).

Could this be a question of the register being detected as a 16-bit register
but really only being an 8-bit register?

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