[Bug 100907] [i965 bisected] boot hang on Dell D830 with kernel > 4.7

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100907

--- Comment #12 from Markus Schauler <myemailu at gmail.com> ---
(In reply to Jim Rees from comment #11)
> Can you try the patch on 4.12? It would be interesting to know if it's the
> same bug. I have not tested 4.13, but this patch fixes the flip_done timeout
> on 4.12 for me.

Yes, this patch fixes the flip_done timeout on v4.12 on by Dell. It also
renders the system unusable. 
Symptoms: It seems that the X11/KDE is starting fine, but on virtual terminal
vt7, there is only the boot-graphics shown. Mouse pointer is displayed and
follows mouse movements. Sometimes, by switching between vt1,vt2,
vt3,vt4,vt5,vt6 and vt7 I get access to my proper desktop (which has been
running somewhere in the background). Could it be that X11 draws into one
buffer, but the patched display driver displays anouther buffer?

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