[Bug 65911] New: radeon: garbled output/only noise through HDMI and GPU lockups

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https://bugzilla.kernel.org/show_bug.cgi?id=65911

            Bug ID: 65911
           Summary: radeon: garbled output/only noise through HDMI and GPU
                    lockups
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.12.1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: tom@voodoo-arts.net
        Regression: No

Created attachment 116301
  --> https://bugzilla.kernel.org/attachment.cgi?id=116301&action=edit
dmesg 3.12.1 with radeon.audio=1

Hi, I am not able to start X on computer with an ATI Radeon HD 7540D graphics
card through HDMI running the linux 3.12.1 kernel. I also tried with 3.10.10
which didn't change anything. I can see my TTY without any problems, though.
Starting X however gives me a totally messed up sceen without any structure or
information---is is basically color noise. Here and there a black or blue
block, but in general it is noise.

Looking at the logs, I can see that there are GPU lockups after which X resets
it. This happens indenpently of me setting radeon.audio=1 or 0. However, I've
attached a dmesg output with radeon.audio=1 and with radeon.audio=0.

After a couple of GPU lockups the kernel will eventually panic. This is the top
of the callstack:

Call Trace:
 <IRQ>
 ? __wake_up
 drm_send_vblank_event [drm]
 radeon_crtc_handle_flip [radeon]
 evergreen_irq_process [radeon]

I've see issues #60709 and #60687, but the fix posted there is already in my
kernel and aparantly doesn't fix my issue. I also tried something suggested in
#60687: hdmi regset 0x12c44 0x00000033

With radeon.audio=0, before I try to start X:
OLD: 0x12c44 (12c44)    0x00000033 (51)
NEW: 0x12c44 (12c44)    0x00000033 (51)

With radeon.audio=0, after I have started X:
OLD: 0x12c44 (12c44)    0x00000000 (0)
NEW: 0x12c44 (12c44)    0x00000033 (51)

With radeon.audio=1, before I try to start X:
OLD: 0x12c44 (12c44)    0x00000000 (0)
NEW: 0x12c44 (12c44)    0x00000033 (51)

With radeon.audio=1, after I have started X:
OLD: 0x12c44 (12c44)    0x00000033 (51)
NEW: 0x12c44 (12c44)    0x00000033 (51)

All this, however, didn't change anything.

If readeon.audio=1 is set, I can play audio over HDMI until there a GPU lockup
and again after the GPU reset.

I've also tried radeon options dpm and no_wb without any success. It also
didn't help to add 'Option "AccelMethod" "EXA"' to the radeon driver/device
section in /etc/X11/xorg.conf.d/20-radeon.conf.

Are there more things I could test or provide?

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