[Nouveau] [Bug 77230] [NV4B] NV40 PGRAPH "unknown bits" - windows render in white

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77230

Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|NV40 PGRAPH "unknown bits"  |[NV4B] NV40 PGRAPH "unknown
                   |- windows render in white   |bits" - windows render in
                   |                            |white

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Well, the errors are coming from blit commands (blit = copy image). So it makes
sense that you'd be seeing white or otherwise uninitialized screen areas.

This code hasn't exactly changed of late. It might even be a hw error of some
sort. I don't think others with NV4B chips are seeing this. And it's an unknown
error on top of that (that's the "unknown bits" part of it... normally it'd say
exactly what it was complaining about).

You can disable acceleration by adding NoAccel to the xorg config, or by
booting with nouveau.noaccel=1.

Unless you're able to identify a change of some sort that makes it go from
non-working to working (other than killing acceleration entirely), I'm not sure
that we'll be able to do much. I'm talking about kernel versions, ddx versions,
that sort of thing.

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