[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 #65 from Daniel Vetter <daniel at ffwll.ch> ---
(In reply to ZeroBit from comment #62)
> It is true, with enabled "Launch CSM" in BIOS laptop starts with normal
> screen IF no another screen is connected. 
> But the big problem is when another external screen is connected before
> booting. The internal screen is black in this case, and all the process of
> booting is displayed on the external screen and no way to switch on the
> internal screen even after boot.
> 
> I work on ASUS Zenbook UX32VD with 2 external monitors connected through VGA
> and HDMI and the only way to work for me is keeping CSM disabled and
> patching kernel.
> At the moment I enjoy this patch
> https://aur.archlinux.org/packages/linux-ak/ which is created thanks to jkp
> (attachment 107199 [details]
> https://bugzilla.kernel.org/attachment.cgi?id=105281&action=edit). It does
> work perfectly. Any other workaround with CSM it's no solution at all.
> Another patch which worked for me also was this
> https://bugzilla.kernel.org/attachment.cgi?id=107199&action=diff

This is very likely a different bug, at least I've seen this one here since
forever on my on ivb machine. We seem to have a really hard time to light up
the eDP panel when the BIOS hasn't switched it on.

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