[Bug 108225] [LPT SPT KBP] Acer V3-772G screen brightness cannot be adjusted with i915.fastboot enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108225

--- Comment #29 from Hans de Goede <jwrdegoede at fedoraproject.org> ---
About the short flicker, I've been tracking down a regression in 4.20 (and thus
also drm-next) which causes the screen to briefly go purple with DSI panels.

Can you try:

git revert 516a49cc19467e298d08a404f73a6e311f4548d1

That fixes the purple flash for me (I need to write a proper commit message and
then submit this revert upstream for 4.20).

While debugging the purple flash I found another possible suspect commit, so if
that revert does not help, you can also try:

git revert 9b27390139dbe0dc10d1899545248862fe826b61

For me that commit makes the initial hw-state readout think none of the pipes
have any active planes (but strangely enough I see no negative effects from
this).

And for good measure if neither revert helps, try combining both.

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