https://bugs.freedesktop.org/show_bug.cgi?id=59168

--- Comment #25 from Petr Stastny <p.stastny-Mmb7MZpHnFY@public.gmane.org> ---
I was digging in the nouveau code a bit and looking where the endlessly
repeating messages 

[   66.090322] nouveau E[  PGRAPH][0000:01:00.0] TRAP ch 1 [0x007fce1000]
[   66.090358] nouveau E[  PGRAPH][0000:01:00.0] SHADER 0xa004021e
[   66.090457] nouveau E[  PGRAPH][0000:01:00.0] TRAP ch 1 [0x007fce1000]
[   66.090485] nouveau E[  PGRAPH][0000:01:00.0] SHADER 0xa004021e

It looks to me like something should be initialized but does not.

I got to the source code file nouveau/core/engine/graph/nvc0.c

        switch (nvc0_graph_class(priv)) {
        case 0x9097:
                nv_engine(priv)->sclass = nvc0_graph_sclass;
                break;
        case 0x9197:
                nv_engine(priv)->sclass = nvc1_graph_sclass;
                break;
        case 0x9297:
                nv_engine(priv)->sclass = nvc8_graph_sclass;
                break;
        }
What I am just curious about - I do not see here any implementation for nvc3 -
is this maybe the problem or is nvc3 already handled by any of the 3 methods
listed here?

When I find some time, I could debug this more. Can somebody point me in the
right direction? Is there any documentation for the implementation? I would
like to fix the problem :)

BTW: the code above is from 3.8-rc7

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