Nouveau - Dec 2013 - [Bug 58378] [NV86] Distorted graphics on NVIDIA GeForce 8400M G after upgrade the kernel to 3.7.0 version

https://bugs.freedesktop.org/show_bug.cgi?id=58378

--- Comment #58 from Andreas Loew <awl1 at gmx.net>
---
> > [aloew at aloew-lap envytools-master]$ sudo ./nva/nvapeek 10200c 10
> > 0010200c: SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS SS
> 
> nvapeek 10200c without the 10. (Not sure what that does.... maybe reads out
> 0x10 regs)
yes - seems to read 10 registers:

[aloew at aloew-lap envytools-master]$ sudo ./nva/nvapeek 10200c   
0010200c: SS
> Well, no one's heard of a "missing" PCRYPT before, but
it's certainly
> conceivable that certain blocks were omitted. I'd feel better with that
> diagnosis if more people chimed in saying that they had the same issue.
>From the screenshots of the corrupted graphics, I definitely think that this
is
the exact same issue.

But I fully agree that it is a pity that nobody of the folks who had raised
this previously and/or commented, do react now that it has probably been
tracked down to its root cause.

And something else seems interesting:

All other people who saw the corruption issue (except nemasu with his/her 8800
GTS, who might have seen a different issue indeed from the dmesg output) also
were using early G86 chips, particularly 8400M-based, and mostly the
"mobile"
variants...

Maybe NVidia omitted part of the 8400 functionality in the mobile variants?
This would again make up a nice (and easy) question to them...!? ;-)

Thanks again & BR,
Andreas

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