[Nouveau] [Bug 27706] Blank screen and "Error referencing VRAM ctxdma: -12" on NV44A with ubuntu lucid beta 2 (worked in alpha 3)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27706

--- Comment #15 from Christopher James Halse Rogers <chalserogers at gmail.com> 2010-04-17 04:06:19 PDT ---
So, the pertinent changes between Lucid Alpha 3 and Beta 2 would be:
Alpha 3 had the nouveau kernel module + drm + ttm from linux 2.6.33 + the
ctxprog voodoo generator backported, in the out-of-tree
linux-backports-modules.
Beta 2 has the drm stack from 2.6.33.2 + a number of fixes pulled in from
nouveau/linux-2.6

If you're interested in bisecting, it should be quicker to start with 2.6.33.2
- if that works, then the problem is in one of the small number of backported
nouveau patches we've got.  If it doesn't, it should be relatively quick to
bisect from 2.6.33 to 2.6.33.2

If you're uncomfortable building this stack from source, the xorg-edgers PPA
has recent snapshots, available here:
https://edge.launchpad.net/~xorg-edgers/+archive/ppa

If that works, then this bug can be closed because it's already fixed.  If that
doesn't work then you'll probably need to do some building from source in order
to identify which change broke it.

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