[Bug 176301] New: Fiji DisplayPort drm_crtc_helper_set_config *ERROR* failed to set mode on

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=176301

            Bug ID: 176301
           Summary: Fiji DisplayPort drm_crtc_helper_set_config *ERROR*
                    failed to set mode on
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.7.5-200.fc24.x86_64
          Hardware: All
                OS: Linux
              Tree: Fedora
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: vedran at miletic.net
        Regression: No

I have a Fiji card

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Fiji
[Radeon R9 FURY / NANO Series] (rev ca)

with two LG DisplayPort 27" 4K monitors. If one of the displays is powered off,
but connected, dmesg shows error messages

[drm:drm_crtc_helper_set_config [drm_kms_helper]] *ERROR* failed to set mode on
[CRTC:34:crtc-1]

and GDM/X will refuse to run.

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