[Nouveau] [Bug 90626] HP ZBook 15 nouveau driver hangup for kernel >= 4.1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90626

--- Comment #32 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Ortwin Glück from comment #31)
> The delays during boot are not caused by the bios shadow code but by this:
> [    5.878439] nouveau E[  PGRAPH][0000:01:00.0] wait for idle timeout (en:
> 1, ctxsw: 0, busy: 1)
> [    7.877714] nouveau E[  PGRAPH][0000:01:00.0] wait for idle timeout (en:
> 1, ctxsw: 0, busy: 1)
> [    9.876992] nouveau E[  PGRAPH][0000:01:00.0] wait for idle timeout (en:
> 1, ctxsw: 0, busy: 1)
> [   11.876268] nouveau E[  PGRAPH][0000:01:00.0] wait for idle timeout (en:
> 1, ctxsw: 0, busy: 1)

Try

nouveau.config=War00C800_0=1

which will enable yet-another workaround.

> 
> So I think you could simply scrap the "fast" version and always use the 4K
> "slow" version for compatibility.

The old code was able to make the fallback just fine, apparently (since it
broke when the rewrite happened). The new code should fall back as well, but...
doesn't. Very odd.

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