https://bugs.freedesktop.org/show_bug.cgi?id=99744
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: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
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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