[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 #5 from Ondrej Balaz <blami at blami.net> ---
Created attachment 85491
  --> https://bugs.freedesktop.org/attachment.cgi?id=85491&action=edit
Xorg.0.log 3.11.0 + drm_fixes

(In reply to comment #4)
> Have you upgraded the kernel? I'm a bit confused that it magically fixed
> itself.

Yes, I am sorry I forgot to mention upgrade from 3.11-rc4 to 3.11.0. In
3.11-rc4 wayland nor kernel doesn't work. In 3.11.0 does.

> 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.

I dumped Xorg.0.log along with the last dmesg dump. It is attached along with
this comment so you can take a look.

> 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.

I'm using X.org configuration automagic (no xorg.conf/no snippets) as I travel
a lot between various workplaces. I can reproduce this only at work where I
have this Advanced MiniDock 3, attached monitors are 2x 1600x1200 native Sun
21"s and my LVDS is 1366x768 so I don't see why X.org tries to set 1024x768. On
the other hand with 3.9.* is 1024x768 default when X.org starts (on all three
displays screen is centered small square 1:1) and I have to reconfigure using
xrandr to 1600x1200 leftof 1600x1200 leftof 1366x768.

Thanks for this workaround. I'm not sure if I'll be able to disable all
external outputs in configuration snippet to reenable them using xrandr once
Xorg is up - if I understand that workaround correctly. Would you please share 
some info on how to do that? (xorg.conf <Monitor> option "Enable" seem to not
work for me).

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