[Bug 48772] New: Signal unstable over Display Port on 2560x1440 monitor

[bugzilla-daemon@xxxxxxxxxxxxxxx]

https://bugs.freedesktop.org/show_bug.cgi?id=48772

             Bug #: 48772
           Summary: Signal unstable over Display Port on 2560x1440 monitor
    Classification: Unclassified
           Product: DRI
           Version: XOrg CVS
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@xxxxxxxxxxxxxxxxxxxxx
        ReportedBy: tvrtko.ursulin@xxxxxxxxxxxx


AMD G-T56N (Radeon HD 6310) hardware with kernel 3.4-rc3 with a Xorg DDX from
28.03.2012. plus a tiling patch from bug 47765.

Dell U2711 monitor native resolution is 2560x1440 on which Display Port
connection is unstable.

I get periodic very brief flashes of vertical noise areas, full screen width,
at various vertical positions, but possible always at least roughly the same
height. Then the screen goes black for a second, comes back for a while,
flashing, or straight back to black and so on. Timings do not look regular,
although I haven't actually timed and analysed them.

Bringing the resolution down to 1920x1200 and it works fine.

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