[Bug 99744] New: Bad crtc detection on Radeon Pro WX 4100

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Feb 9 20:27:57 UTC 2017


            Bug ID: 99744
           Summary: Bad crtc detection on Radeon Pro WX 4100
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/AMDgpu
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: freedesktop at bluematt.me
        QA Contact: xorg-team at lists.x.org

Radeon Pro WX 4100 specs quoted from an AMD press release upon announcement
seem to indicate that it is capable of driving 4 4k monitors, however,
xrandr/Xorg will only allow it to drive 2 monitors at any one time
(irrespective of configured resolution).

xrandr --verbose lists each of the 4 MiniDP ports as "CRTCs: 0 1" and xrandr
--listproviders lists "Provider 0: id: 0x58 cap: 0xf, Source Output, Sink
Output, Source Offload, Sink Offload crtcs: 5 outputs: 4 associated providers:
0 name:POLARIS11 @ pci:0000:81:000".

Kernel 4.9.8

(haven't tested on Windows or anything else as those are generally not
available to test on this machine).

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