[Bug 39683] New: radeon "hd6770 flex" dpms fails to unblank one display sometimes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=39683

           Summary: radeon "hd6770 flex" dpms fails to unblank one display
                    sometimes
           Product: DRI
           Version: XOrg CVS
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: chainsawbike at gmail.com


when "dpms off" is triggered ( by timeout, xset ) both displays turn off but
only one display turns back on, if i do `xset dpms force off` after then both
displays turn back on as expected

the standby and suspend states also seem to behave in the same way but i only
briefly checked

there seems to also be some timing factor as the second time seems to need to
be triggered soon after the first for both displays to turn back on

the display affected is labeled as"DisplayPort-1" but is infact a dvi plug
(note this a "flex" model, allowing 3 dvi displays out of the box so it may be
a bit different to a standard one ...dunno)

the only interesting thing i could find in the logs:
dmesg:
[drm:radeon_dp_get_link_status] *ERROR* displayport link status failed
[drm:radeon_dp_link_train_cr] *ERROR* clock recovery failed
(once - part way through the repeats of the following message)
[drm] force priority to high 
(repeated - about the amount i would expect if it was repeated once per failed
attempt)

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