[Bug 73848] [Radeon] Blank screen after boot with kernel 3.12.x, xorg 1.15

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73848

--- Comment #5 from Marti Raudsepp <marti at juffo.org> ---
(In reply to comment #3)
> Any chance you could bisect to see what the fix was?

I got my hands on a spare disk and did the bisect.
Strangely enough this turned up (!?)

["first bad commit" meaning good, since I had to invert bisect bad/good]

ad41550666f89b5af9335fcde9e98b61190daf99 is the first bad commit
commit ad41550666f89b5af9335fcde9e98b61190daf99
Author: Alex Deucher <alexander.deucher at amd.com>
Date:   Thu Sep 26 13:11:18 2013 -0400

    drm/radeon: enable hdmi audio by default

    Seems to be stable enough for the majority of users.
    It can be disabled on the fly via connector attributes.

    Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

Just to make sure, I double-checked...

uname -r && dmesg |grep 'VM fault'
3.12.0-rc3-ARCH-00404-gad41550

uname -r && dmesg |grep 'VM fault'
3.12.0-rc3-ARCH-00403-g10ebc0b
[   18.716461] VM fault (0x00, vmid 0) at page 0, read from unknown (0)
[   18.716466] VM fault (0x00, vmid 0) at page 0, read from unknown (0)
[   18.716470] VM fault (0x00, vmid 0) at page 0, read from unknown (0)
...

GDM successfully starts with the 1st and fails with the 2nd.

What does this even mean, how can disabling HDMI audio break things? :)

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