[Nouveau] GeForce 6100 (NV4E) & nouveau regression in 3.12

[Ilia Mirkin]

On Sun, Feb 9, 2014 at 5:08 PM, Rafał Miłecki <zajec5 at gmail.com> wrote:
> Hi guys,
>
> Last week I've switched from my old & good 3.4.63 to 3.14-rc1 and
> noticed nasty display corruptions when using nouveau. It seems that
> changing parts of the screen are appearing for a fraction of second in
> random places. I've recorded this behavior:
> http://www.youtube.com/watch?v=IEq7JzGVzj0
>
> My hardware is some old motherboard with
> 00:05.0 VGA compatible controller [0300]: NVIDIA Corporation C51G
> [GeForce 6100] [10de:0242] (rev a2)
> integrated. Since my CPU is ancient AMD Sempron(tm) Processor 2800+ it
> took me few days to track this issue.
>
> There goes some summary of various kernels:
>
> 1) 3.4.63
> No display problems. Works great.
>
> 2) commit 928c2f0c006bf7f381f58af2b2786d2a858ae311
> drm/fb-helper: don't sleep for screen unblank when an oops is in progress
> Scrollbars have a pink line. I didn't track which commit introduced
> this pink corruption. No other problems.
>
> 3) commit c21eb21cb50d58e7cbdcb8b9e7ff68b85cfa5095
> Revert "drm: mark context support as a legacy subsystem"
> This fixes pink lines on scrollbars and introduces this nasty display
> corruption. It's one commit after previous one.
> It means it's the first bad commit for these nasty corruptions recoded
> and uploaded to YouTube.
>
> 4) 3.14-rc1
> No changes since c21eb21cb50d58e7cbdcb8b9e7ff68b85cfa5095. No pink
> lines, but display corruptions happening.

Can you boot with nouveau.config=NvMSI=0 ? If that helps, there are
some patches on the nouveau/dri-devel lists (search for "nv4c") that
may help you.

  -ilia