[Bug 52330] Triple monitor desktop intermittent slow updates

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=52330

--- Comment #9 from Mickaël Perrin <dev at mickaelperrin.fr> ---
I get the same problem as the submitter.

Try to run a 3 monitors desktop, but unable to get the 3 monitors working at
the same time when using my central monitor at his native 4k resolution.

Tried a lot of things as adviced in the comment thread. 

I am currently running :
  - Xubuntu 15.04
  - Xorg edgers PPA
  - Self compiled master branch radeon driver
  - Xorg.conf options : Option "AccelMethod" "glamor" / Option "ShadowPrimary"
/ Option "TearFree"

Depending on the driver version used and the xorg-edgers PPA update or not, I
can get :
  - my central monitor working at 4k while the two others displays scratched
fixed image
  - my two side monitor working while the central 4k monitor displays a fixed
image

Some ressources :
  - photo of the "scratched images" : http://bit.ly/1SSDPtx
  - my latest xorg.conf : http://paste.ubuntu.com/12012614/
  - my latest Xorg.0.log : http://paste.ubuntu.com/12012625/
  - result of dmesg | grep 'radeon\|drm' : http://paste.ubuntu.com/12012626/
  - result of xrandr --verbose : http://paste.ubuntu.com/12012645/
  - no errors in /var/log/syslog when running xrandr
  - more detailed explanations of what I tried on askubuntu :
http://bit.ly/1SSE4F0

Note that :
  - it works on windows,
  - it works sloooowly with amd binary drivers
  - with xorg edgers ppa and git version of ati driver, I can't get the two
side monitors to work even when decreasing the resolution of the central
monitor to 2560x1440.

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