[Nouveau] [Bug 58776] DRM NOUVEAU: cannot boot with kernel >=3.7

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=58776

--- Comment #7 from gabriele balducci <balducci at units.it> ---
Thanks a lot.

1) I cannot find (or I am not able to recognize) any option related to
   AGP/IOMMU in my BIOS menu.
   Following advice in
   http://www.kernel.org/doc/Documentation/x86/x86_64/boot-options.txt,
   I have booted with iommu=soft, which apparently makes the IOMMU
   complaint go away from demsg, but I don't know if this is really a
   solution...
   In any case, booting with (only) iommu=soft, does not make any
   difference: i.e. the machine freezes as above

2) The nouveau.vram_pushbuf=1 option allows me to boot fine (with or
   without the iommu=soft option above)!
   However, now X11 has problems.
   After starting X11, text in menus (e.g. emacs, firefox) and in
   window borders is made of unreadable black rectangles; text in
   windows (e.g. xterm text lines, text in emacs buffers etc) are fine, though.
   This problem goes away if I boot into X11 with
                    Option  "Accel"   "Off"
   i.e.: if I switch acceleration off, everything works nicely (but,
   of course, I have no acceleration)

I have attached dmesg for kernel 3.6.10 (which works perfectly), the
new dmesg for kernel 3.7.1 with iommu=soft and nouveau.vram_pushbuf=1,
my xorg.conf and xorg.0.log for kernel 3.6.10 and 3.7.1 (with/without
accel)

I'll be happy to send any other information which might help to
clarify this problem

thank you very much again

ciao
gabriele

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