[Nouveau] [Bug 46557] nouveau: nv4E 2D acceleration broken on 64-bit kernel; works on 32-bit

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=46557

--- Comment #8 from D. Hugh Redelmeier <hugh at mimosa.com> 2012-06-17 06:10:59 PDT ---
I experience something similar on my notebook.

- AMD Turion CPU; 3GiB RAM; nVidia GeForce Go 6100 video controller

- was working fine with 64 bit Ubuntu 10.04 using nv X video driver

- problems on 64 bit Ubuntu 12.04 with nouveau driver (VESA driver works but
does not support native resolution)

Symptoms are various.  Simplest, on fully updated system: LightDM seems to work
to allow login but Unity desktop does not show up except for background.

dmesg shows a lot of messages like this (and variants):
 [drm] nouveau 0000:00:05.0: PFIFO_DMA_PUSHER - Ch 3 Get 0x01256038 Put
0x011c60b0 State 0x4ffe0004 (err: INVALID_MTHD) Push 0x00000000

/var/log/Xorg.0.log shows lots of mayhem after this message:
 [mi] EQ overflowing.  Additional events will be discarded until existing
events are processed.

Adding mem=2g to kernel seems to fix the problem!

Thanks Salah for this discovery!  Thanks xexaxo on #nouveau for recognizing my
problem and pointing me here!

I will attach logs.

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