[Bug 89971] HDMI out *not* working with radeon (mobile 8550g)

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=89971

            Bug ID: 89971
           Summary: HDMI out *not* working with radeon (mobile 8550g)
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: adrianovidiugabor@gmail.com

Created attachment 114999
  --> https://bugs.freedesktop.org/attachment.cgi?id=114999&action=edit
screen's content

Hi all.

If I'm connecting my laptop's HDMI out to my TV I get a black screen with
garbage on top (see attached pic). This is with mirror mode on. If making the
second screen primary, the pc blocks and I have to restart it. It won't unblock
even if I disconnect the cable.

If switching to one of the virtual consoles, everything works correctly as it
should, so the problem seems to be related somehow to the display server. 

The Tv is recognized correctly by xrandr.

Specs: Asus laptop, with AMD A8-5550M, Radeon 8550G(Aruba)/8670M(Hainan), OS
ArchLinux(x64) Xorg-xerver 1.17, kernel 3.19.3, Mesa-git, xf86-ati-git,
llvm-svn.

This doesn't seem to be a regression (experienced it with older versions of the
kernel and userspace components) and it's reproducible on another machine. 

HDMI out works on Windows and ChromeOS.
Didn't try Catalyst on Linux.

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