dual Radeon graphics cards and Xrandr 1.4

[Michel Dänzer]

On 19.10.2015 12:26, J. Hart wrote:
> On 10/18/15 18:36, Alex Deucher wrote:
>> Please attach your xorg log and dmesg output. Also, what desktop
>> environment are you using? IIRC, you need to be using a compositor. Alex 
> 
> Attached is the Xorg log.   I was controlling the system remotely via
> ssh from another machine.  I brought the system to run level 3, and
> started the X server manually.  In this case, there is no "desktop". 
> All the setup in question should be done before a window manager or any
> desktop starts up, to the best of my knowledge.

Beware that if there's no other clients running when you run xrandr, the
X server resets itself after xrandr disconnects from it. The Xorg log
you attached shows several such resets. Have you tried your tests with
at least a window manager or some other long-running client?


> before "setprovideroutputsource" via xrandr:
> 
> sh-3.2$ xrandr --listproviders
> Providers: number : 2
> Provider 0: id: 0xba cap: 0xf, Source Output, Sink Output, Source
> Offload, Sink Offload crtcs: 2 outputs: 3 associated providers: 0
> name:radeon
> Provider 1: id: 0x54 cap: 0xf, Source Output, Sink Output, Source
> Offload, Sink Offload crtcs: 2 outputs: 3 associated providers: 0
> name:radeon
> 
> I then issue the following command from a bash shell with "DISPLAY=:0" :
> xrandr --setprovideroutputsource 1 0

If the above doesn't help, maybe try swapping the 1 and 0 here. I can
never remember which way around they need to be. :)


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