Comment # 15 on bug 1185601 from Wolfgang Wander

(In reply to Takashi Iwai from comment #14)
> OK, then could you fiddle with i915.enable_dpcd_backlight=xxx boot option?
> Pass 0, 1, 2 or 3 to xxx.

0: no change
1: no change
2: no change
3: no change

in all cases the backlight comes on, but the screen itself stays black.

Do you want dmesgs of these attempts, with drm.debug=0x1e? And if so, with the
SuSE kernel or the vanilla 5.12.0?

            Wolfgang