Multi screen and graphics cards failed with radeon driver on debian stretch

[Michel Dänzer]

On 23/06/17 11:15 PM, pbasnews-deb at yahoo.fr wrote:
> Hello,
> 
> On debian previous version (jessie) I managed to use my 3 screen on KDE but since [b]stretch[/b] update, my conf doesn't work anymore.
> If anyone could help me?

You shouldn't need any xorg.conf file.


> $ xrandr --listproviders
> Providers: number : 2
> Provider 0: id: 0x99 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 2 outputs: 3 associated providers: 0 name:ATI Radeon X1550 64-bit @ pci:0000:02:00.0
> Provider 1: id: 0x53 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 2 outputs: 2 associated providers: 0 name:ATI Radeon 3000 Graphics @ pci:0000:01:05.0

After starting X, run

 DISPLAY=:1 xrandr --setprovideroutputsource "ATI Radeon 3000 Graphics @ pci:0000:01:05.0" "ATI Radeon X1550 64-bit @ pci:0000:02:00.0"

(in a terminal, or a session startup script such as ~/.xsession). Then
you can configure the outputs of both GPUs with xrandr or any graphical
monitor configuration tool using the RandR extension.


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