[Nouveau] [Bug 40630] BIOS POST tables induced problems on GeForce 9500 GT

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=40630

--- Comment #74 from maximlevitsky at gmail.com 2011-09-18 15:41:52 PDT ---
OK Folks, it was just one bit, and it was unset by bios init tables.
One 
Bit 0x400000 of register 0x4008, the register that responsible for memory
clock.

Actual values of this register:


before suspend:

0x90596400 PCLOCK.MPLL1 => { UNK0 = 0x6400 | P = 0x1 | UNK19 = 0xb | UNK28 =
0x1 | ENABLE }

after suspend:   
0x90016400 PCLOCK.MPLL1 => { UNK0 = 0x6400 | P = 0x1 | UNK19 = 0 | UNK28 = 0x1
| ENABLE }

test1:  0x90096400 - corruptions, but stable (with ctxfw, hang after 10 secs)
test2   0x90516400 - good (with ctxprog)
test3   0x90416400 - good (with ctxprog), without ctxprog: good
test4   0x90116400 - corruptions without ctxprog

Also seems that without nvidia's ctxprog, while we always got corruption, we
didn't get hangs (but we tested just few laps of STK+glxgears)
It doesn't matter much. It is one bit and its in unknown PLL area....

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