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

[bugzilla-daemon@freedesktop.org]

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

--- Comment #40 from Tom Stellard <tstellar@gmail.com> ---
(In reply to Linux User from comment #38)
> > Do you have an X server running?
> I am (on one of GPUs). And I can understand X could be slow, etc and
> adjusting intensity on GPU sharing X server is well known thing to me.
> 
> But I'm talking about GPU lockups. When GPU crashes due to ring stall and
> driver have to restart it, its likely something else failing? Somehow,
> attempts to run bfgminer --scrypt with high intensity often can provoke ring
> stalls.
> 
> > drm.rnodes=1 to your kernel command line.
> Cool, but...
> 1) It could be nice to view output on separate monitor and graphic terminal
> looks better than just framebuffer console. At least in trial runs I would
> prefer to deal with my favorite terminal, adjusting intensity of 1st GPU a
> bit.
> 2) I do not think apps should be cause fatal GPU deadlocks, effectively
> screwing all graphics, system-wide.
> 
> Though thanks for render nodes hint - sounds like it can be really valuable
> thing to try on some headless machines, etc.
> 
> P.S. also there is another silly issue. If I just install Ubuntu and run
> bfgminer on multi-GPU setup within X session, it would only see 1st GPU
> (where X server running). Remaining GPUs are not detected. Fix is to either
> run bfgminer as root (extremely unsafe!!!) or create new user and make
> "video" it's primary group. The user who installs Ubuntu is a member of
> "video" group, but "video" is his secondary group, which is very common.
> Somehow, kernel seems to disregard permissions in such case and would issue
> -EPERM on certain syscall, making bfgminer unable to find GPUs except one
> used by X. Generally it means that user can't use more than 1 GPU unless he
> is either root (very dangerous!) or video is his primary group (inconvenient
> and uncommon). I believe it is a bug and I should file it? Since I fail to
> understand how average Joe would be able to use some OpenCL program in
> multi-GPU setup and get it working "by default" on all available GPUs. I
> guess I should file it as new bug? Is it kernel issue or MESA, etc?


Enabling rendernodes should make both GPUs visible.

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