randr: Virtual monitor not present with MST display

[Michel Dänzer]

On 2019-03-06 1:41 p.m., Paul Menzel wrote:
> On 03/05/19 20:07, Alex Deucher wrote:
>> On Tue, Mar 5, 2019 at 1:16 PM Paul Menzel wrote:
> 
>>> Using the MST display Dell UP3214Q (two panels) with an AMD system,
>>> the virtual monitor object is not created. GDM and Xfce consider both
>>> panels as separate screens (`xrandr --listmonitors`).
>>>
>>> [    0.000000] Linux version 4.20.13.mx64.248 (root at holidayincambodia.molgen.mpg.de) (gcc version 7.3.0 (GCC)) #1 SMP Wed Feb 27 14:10:55 CET 2019
>>>
>>> [   79.494297] [drm] DM_MST: stopping TM on aconnector: 00000000a8109331 [id: 56]
>>> [   79.494362] [drm] DM_MST: Disabling connector: 00000000776ea22b [id: 63] [master: 00000000a8109331]
>>> [   79.494406] [drm] DM_MST: Disabling connector: 00000000057ebdbb [id: 67] [master: 00000000a8109331]
>>> [   79.781882] snd_hda_intel 0000:00:1f.3: spurious response 0x0:0x2, last cmd=0x201f0500
>>> [   86.028806] [drm] DM_MST: starting TM on aconnector: 00000000a8109331 [id: 56]
>>> [   86.053072] [drm] DM_MST: added connector: 000000001c9b49ed [id: 71] [master: 00000000a8109331]
>>> [   86.108540] [drm] SADs count is: -2, don't need to read it
>>> [   86.386661] [drm:create_stream_for_sink [amdgpu]] *ERROR* Failed to create stream for sink!
>>> [   87.237878] [drm] DM_MST: added connector: 00000000c3ffcbbb [id: 80] [master: 00000000a8109331]
>>> [   87.293028] [drm] SADs count is: -2, don't need to read it
>>> [  206.993344] [drm] DM_MST: stopping TM on aconnector: 00000000a8109331 [id: 56]
>>> [  206.993423] [drm] DM_MST: Disabling connector: 000000001c9b49ed [id: 71] [master: 00000000a8109331]
>>> [  206.993456] [drm] DM_MST: Disabling connector: 00000000c3ffcbbb [id: 80] [master: 00000000a8109331]
>>> [  207.548051] [drm:create_stream_for_sink [amdgpu]] *ERROR* Failed to create stream for sink!
>>> [  207.603193] [drm:create_stream_for_sink [amdgpu]] *ERROR* Failed to create stream for sink!
>>> [  207.762388] traps: xfdesktop[2225] general protection fault ip:7f588981226c sp:7ffee65af370 error:0 in libgobject-2.0.so.0.5800.1[7f58897da000+56000]
>>> [  210.320612] [drm] DM_MST: starting TM on aconnector: 00000000b456cd59 [id: 62]
>>> [  210.343497] [drm] DM_MST: added connector: 00000000735839d5 [id: 73] [master: 00000000b456cd59]
>>> [  210.399168] [drm] SADs count is: -2, don't need to read it
>>> [  210.404454] [drm] DM_MST: added connector: 00000000cccb0c2d [id: 88] [master: 00000000b456cd59]
>>> [  210.675589] [drm] SADs count is: -2, don't need to read it
> 
> I didn’t provide the output of xrandr in my previous message.
> 
>     $ xrandr --listmonitors
>      Monitors: 2
>      0: +DisplayPort-9 1920/698x2160/392+0+0  DisplayPort-9
>      1: +DisplayPort-10 1920/698x2160/392+1920+0  DisplayPort-10
> 
> Please find the X.Org X Server log attached.
> 
>>> With an Intel system, the monitor object is shown.
> 
> To clarify, the modesetting driver is used with the Intel hardware.

Does this work better with the modesetting driver on the AMD system?


-- 
Earthling Michel Dänzer               |              https://www.amd.com
Libre software enthusiast             |             Mesa and X developer