[Bug 72785] bfgminer --scrypt on 7xxx+

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=72785

--- Comment #37 from Tom Stellard <tstellar@gmail.com> ---
(In reply to Linux User from comment #36)
> Got similar issues when trying scrypt. I have relatively recent bfgminer (~1
> month old git build) and more or less recent graphics stack: 3.17 kernel,
> mesa 10.4 pre-release from Oibaf PPA and LLVM 3.5.1
> 
> I have bunch of HD5000 based cards, mostly HD5750/5770 and somesuch and R9
> 270. Tests have shown bfgminer performs correctly when computing SHA256 and
> goes about 80% of catalyst at 57xx and even better than that on R9 270. 
> 
> However things are much worse when it comes to scrypt. I got impression open
> driver can get issues if something aggressively using GPU VRAM.
> 
> Some observations about open drivers stack so far:
> - If you set scrypt intensity too high, there is high risk GPU would lock up
> in fatal way and crash (can happen on both 57xx and R9).
> 

Do you have an X server running?  One cause of lockups is bfgminer hogging the
GPU, and X not being able to do anything.  I recommend trying without an X
server.  For best results when not using an X server, enable render nodes in
the kernel by adding drm.rnodes=1 to your kernel command line.

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