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@lists.freedesktop.org ReportedBy: chainsawbike@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)