<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Triple monitor desktop intermittent slow updates" href="https://bugs.freedesktop.org/show_bug.cgi?id=52330#c9">Comment # 9</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - Triple monitor desktop intermittent slow updates" href="https://bugs.freedesktop.org/show_bug.cgi?id=52330">bug 52330</a> from <a class="email" href="mailto:dev@mickaelperrin.fr" title="Mickaël Perrin <dev@mickaelperrin.fr>"> Mickaël Perrin</a> <pre>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" : <a href="http://bit.ly/1SSDPtx">http://bit.ly/1SSDPtx</a> - my latest xorg.conf : <a href="http://paste.ubuntu.com/12012614/">http://paste.ubuntu.com/12012614/</a> - my latest Xorg.0.log : <a href="http://paste.ubuntu.com/12012625/">http://paste.ubuntu.com/12012625/</a> - result of dmesg | grep 'radeon\|drm' : <a href="http://paste.ubuntu.com/12012626/">http://paste.ubuntu.com/12012626/</a> - result of xrandr --verbose : <a href="http://paste.ubuntu.com/12012645/">http://paste.ubuntu.com/12012645/</a> - no errors in /var/log/syslog when running xrandr - more detailed explanations of what I tried on askubuntu : <a href="http://bit.ly/1SSE4F0">http://bit.ly/1SSE4F0</a> 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.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>