[Bug 78321] New: Xorg Freeze with radeon.dpm=1

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=78321

            Bug ID: 78321
           Summary: Xorg Freeze with radeon.dpm=1
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.15.1-1-ARCH
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: perry3d@gmail.com
        Regression: No

Created attachment 140381
  --> https://bugzilla.kernel.org/attachment.cgi?id=140381&action=edit
journalctl -k output

Hi,

i am using a "[AMD/ATI] Barts XT [Radeon HD 6870]" card on an Arch Installation
with Kernel 3.15.1. 
If i append "radeon.dpm=1" to the kernel parameters i can boot fine into KDM.
But at the login process (KDE) Xorg freezes. I can still move the mouse pointer
and the SysRQ Keys are also working.
Sometimes, after i press SysRQ + K i can manage to get back to KDM and start
another login attempt. And in some cases i can login completely and work in a
stable environment.
I attached the output of "journalctl -k" after getting back to KDM with
SysRQ+K.

Right now i am building linux-git from AUR.

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