[Bug 104205] New: displayport connected monitor doesn't initialize display

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104205

            Bug ID: 104205
           Summary: displayport connected monitor doesn't initialize
                    display
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/AMDgpu
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: magnade at gmail.com
        QA Contact: xorg-team at lists.x.org

I have a LG 29UB55-B 21:9 monitor connected via DisplayPort to a Radeon R7 370
card
after boot when xorg loads 99% of the time the monitor won't see a signal and
goes to sleep
once its woken back up by its power button it sees the normal screen at its
native res of 2560x1080

I also see I assume the same problem if i change resolution down to 1920x1080
its fine but switch back to 2560x1080 and screen goes to sleep with no signal
wake it back up and fine again at 2560

I see the below in dmesg:

[    6.400479] [drm:radeon_dp_link_train [radeon]] *ERROR* clock recovery
reached max voltage
[    6.400523] [drm:radeon_dp_link_train [radeon]] *ERROR* clock recovery
failed

kernel is 4.14.4 currently it's been going on since I got the monitor
I don't recall what version that was.

xorg is on 1.19.5
amdgpu driver is 1.4.0
also tried the radeon driver and acts same
haven't tried binary drivers

no errors in xorg log

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