Only one of LVDS and VGA-0 work on HP Pavilion m6 with Radeon HD 7660G
Submitted by Suren Karapetyan
Assigned to Default DRI bug account
Description
When I attach an external monitor to my laptop and put it next to the internal one using xrandr, the internal monitor goes blank.
If I then disable the external monitor, the internal one starts working.
Sometimes (after a lot of switching), they both go blank. Weren't able to make them both work at the same time.
Based on the logs, the system thinks that both outputs are working (the screen size gets increased to fit both monitors, the taskbar remains on the primary screen even if it is not working).
I'm using the free "radeon" driver. I don't think the version is important, because I have the same issue with Fedora 20 and Fedora 22.
The system has a second discreet radeon GPU, but I don't use it.
00:01.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Trinity [Radeon HD 7660G] [1002:9900]
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Thames [Radeon HD 7500M/7600M Series] [1002:6840] (rev ff)
And from xrandr output it looks like all outputs are connected to the default integrated GPU:
[skarap@roadrunner ~]$ xrandr --listproviders
Providers: number : 3
Provider 0: id: 0x8c cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 4 outputs: 3 associated providers: 2 name:radeon
Provider 1: id: 0x55 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 6 outputs: 0 associated providers: 2 name:radeon
Provider 2: id: 0x55 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 6 outputs: 0 associated providers: 2 name:radeon