[Bug 67825] New: Screen corruption/lockups on Northern Islands (BARTS) with dpm active

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=67825

          Priority: medium
            Bug ID: 67825
          Assignee: dri-devel@lists.freedesktop.org
           Summary: Screen corruption/lockups on Northern Islands (BARTS)
                    with dpm active
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: Alexander@Schwarz-Regensburg.de
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: DRI CVS
         Component: DRM/Radeon
           Product: DRI

Created attachment 83713
  --> https://bugs.freedesktop.org/attachment.cgi?id=83713&action=edit
Greps from dmesg for "drm" and "radeon"

I'm receiving massive screen corruptions on my Radeon HD 6870 when I use dpm on
an rc1/2/3/4 kernel with the following symptoms:
There's flickering all over the screen, artifacts and after trying to open
anything related to graphics (glxgears, animated menus in KDE, etc...) the
machine freezes and can only be revived with a hard reset. Sometimes the
machine doesn't even get so far and freezes immediately before. This is
accompanied by a black screen or blue lines on the screen.

The huge issue is: there's absolutely no error in dmesg and dpm is also
automatically set in power_method

I'm including grep'd dmesg's for "drm" and "radeon" anyways, to illustrate that
everything seems to load fine.

More information about the card and my system: XFX Radeon HD 6870 Black Edition
with stock bios on an Arch Linux 64 bit system.
I'm using the newest mesa-git, libdrm, xf86-video-ati-git and ati-dri-git.

It's nearly impossible to gather more information than dmesg, because the
system is extremely unstable when using dpm.
When I'm NOT setting radeon.dpm=1 the system boots fine, has 3D acceleration
and I've not a single issue with my graphics stack.

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