Nouveau - Feb 2015 - [Bug 28095] X crash with PFIFO_CACHE_ERROR. (Nouveau on Riva TNT).

https://bugs.freedesktop.org/show_bug.cgi?id=28095

--- Comment #14 from Ilia Mirkin <imirkin at alum.mit.edu> ---
So by the sounds of it, we broke the display stuff at some point between
pre-history (i.e. before nouveau was in mainline) and... now. I'm fairly
sure
that it's a fairly self-contained problem -- my NV05 TNT2 M64 works fine (or
at
least did recently, I think I last tested after 3.10 or so). Another user's
NV04 also worked OK on linux-3.9 (from bug 68854), although it was the Creative
Labs one. However he also had the resolution issue (maxing out at 1024x768).

You have one of the (infamous?) BMP v0 vbioses, may be interesting to attach it
to this bug, although I sincerely doubt that is the source of the issues
(before BMP v2 or so, we just ignore it entirely). Without nouveau loaded, you
can get it from /sys/kernel/debug/dri/0/vbios.rom .

The unfortunate reality here is that you are in posession of fairly unique
piece of hardware, and that (I believe) similar HW works fine. So... it's
something "funny" going on. 

You might try booting with

nouveau.debug=debug drm.debug=14

and capturing the kernel messages from that. Perhaps something interesting will
come up.

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