[Nouveau] [Bug 54700] Distorted graphics (double cursor) with GeForce 4200Go (NV28)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54700

--- Comment #66 from Ilia Mirkin <imirkin at alum.mit.edu> ---
BTW, interesting. In your VBIOS, it tells us to do

0xcbf2: 7a 80 00 10 00 00 00 00 e0                     ZM_REG   R[0x100080] =
0xe0000000

Which is why that bit gets lost on resume (but not on kexec, since init scripts
don't run, since the adapter is already init'd). Good to know, that means that
any fixup would have to be made _after_ the bios gets executed... or more
likely, as part of the COMPUTE_MEM thing (meminit in
core/subdev/devinit/nv20.c), which gets executed in "init script 5", which
happens after that "init script 1" which contains the 0x100080 = 0xe0000000
command. Although then it wouldn't happen on boot, so nevermind. Has to happen
after the vbios executes.

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