[Nouveau] [Bug 22956] nv50: kms, random screen blinkage

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=22956





--- Comment #11 from Kamil Kaminski <kamilkss at gmail.com>  2009-07-30 14:12:58 PST ---
I noticed something interesting with 0x00020074 register, if you look at the
logs, when this register is omitted/tagged as unknown everything works fine.
Currently with git code this is what's happening:

nouveau 0000:01:00.0:   Write: Reg: 0x00020074, Data: 0x80000000

while the mmiotrace from 190.18 blob shows this:

R 4 222.638450 3 0xfa020074 0x90000000 0x0 0
W 4 222.638466 3 0xfa020074 0x90010000 0x0 0
...
R 4 222.638579 3 0xfa020074 0x90010000 0x0 0
W 4 222.638594 3 0xfa020074 0x90010000 0x0 0

notice that blob writes 0x90010000 to that registers, do we know what this
register does?





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