Comment # 39
on bug 72785
from Michel Dänzer
(In reply to Linux User from comment #36) > P.P.S. and what about better fan/intensity control? See bug 73338. (In reply to Linux User from comment #38) > 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? You should report this to Ubuntu.
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