[Bug 59841] [IVB cpu eDP] panel is broken due to 657445fe86 (eDP bpp clamping)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=59841

--- Comment #210 from jkp <jkp at iki.fi> ---
>From summary in comment 196:

>1) Clock recovery part of link training fails.
>
>2) Black screen with link computation done in 18 bpp. Works if computation is
>done in 24 bpp, and dithering to 18 bpp is set after that.
>
>3) In UEFI mode of affected machines, the VBT reports 18 bpp instead of 24 bpp,
>triggering the above.

Then there's

4) In CSM mode, with external monitor connected, X session can't be properly
started with gdm.

1) is now forked to https://bugs.freedesktop.org/show_bug.cgi?id=70117
4) is now forked to https://bugs.freedesktop.org/show_bug.cgi?id=70120

How about solving 3) with the quirk and/or kernel parameter approach now? Would
leave 2) open.

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