[Bug 93270] Only one of LVDS and VGA-0 work on HP Pavilion m6 with Radeon HD 7660G

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=93270

            Bug ID: 93270
           Summary: Only one of LVDS and VGA-0 work on HP Pavilion m6 with
                    Radeon HD 7660G
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: surenkarapetyan@gmail.com

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

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