[Bug 67906] [ivb 3 pipe regression] Identical HDMI outputs don't share PCH PLL

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67906

--- Comment #4 from Daniel Vetter <daniel at ffwll.ch> ---
(In reply to comment #3)
> please find the dmesg with your patch applied (3.11.0 with latest drm-fixes
> and your patch). Since last time I see small improvement - all displays are
> lit during boot (i915 kms) and also Wayland/Weston works as expected. Xorg
> still crashes with same error.

Have you upgraded the kernel? I'm a bit confused that it magically fixed
itself.

For the Xorg crash we need to have the Xorg.log file. But looking at the
logfiles it seems like Xorg wants to set up a shared 1024x768 config. But since
it leaves the other 2 outputs enabled we'll then run out of display PLLs and
fail the modeset. Of course X shouldn't crash if this happens, but picking the
1024x768 config is the expected behaviour in some configurations since this
resolution is the only common one shared by all 3 outputs. Kernel/Wayland work
better since they pick the native resolution by default.

Note that if you disable (manually) the 2 hdmi outputs first and then enable
them at 1024x768 it would also work. Unfortunately we don't yet have an atomic
modeset interface to make this possible for X startup and similar places.

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