[Bug 188091] New: Resume with two monitors, second monitor is not resumed until VT switch

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=188091

            Bug ID: 188091
           Summary: Resume with two monitors, second monitor is not
                    resumed until VT switch
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.9 rc5
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: gwhite at kupulau.com
        Regression: No

This is for AMDGPU.  

I have an RX470 with two monitors attached via DP.  After a long suspend, when
one of the monitors has apparently gone into a deeper sleep state, it takes one
of them longer to wake.  When this happens,  the second monitor is not detected
and will not be seen until I switch to a VT and then back again.  Here's what I
see in dmesg before the switch:

18887.893100] [drm:amdgpu_atombios_dp_link_train] *ERROR* displayport link
status failed
[18887.893103] [drm:amdgpu_atombios_dp_link_train] *ERROR* clock recovery
failed
[18888.070075] [drm:amdgpu_atombios_dp_link_train] *ERROR* displayport link
status failed
[18888.070077] [drm:amdgpu_atombios_dp_link_train] *ERROR* clock recovery
failed

Again, after I switch to a VT and then back again, all is well.

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