[Bug 98908] [IVB] Unreliable handling of 3 displays

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98908

yann <yann.argotti at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      i915 platform|                            |IVB
      i915 features|                            |display/DP

--- Comment #1 from yann <yann.argotti at intel.com> ---
(In reply to Dorota Czaplejewicz from comment #0)
> Connecting all 3 displays to a desktop IVB (i7-3770) doesn't work reliably.
> Results range from image corruption (by shifting), to never waking up one of
> the displays (always the one on DisplayPort in my tests).
> 
> Xrandr shows all displays as connected, with the correct resolutions.
> 
> Changing the on/off state of a single display causes all to flicker, unlike
> with 2 displays.
> 
> In the case of all 3 screens being active (when all available at boot - some
> corrupted), using xrandr to turn off and back on the one assigned to CRTC2
> fails on enabling.
> 
> Switching between VTs works for one cycle Xorg -> tty -> Xorg. Following
> attempts leave the screens blank.
> 
> Unfortunately, I don't have access to the logs right now.
> 
> Configuration tested:
> CPU: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz
> Motherboard: ASRock H77 Pro4/MVP
> Displays: DP (DVI) + DVI + VGA
> OS: Fedora 24
> Kernel: 4.8.8-200.fc24.x86_64

please post your logs as soon as you get them

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