Am 24.07.2014 19:19, schrieb Federico Bruni:
>> Then the kernel driver needs to be loaded. Newer nvidia systems need
>> two
>> kernel modules: nvidia and nvidia_uvm.
>>
>> Check with 'lsmod | egrep nvidia' if both are there.
>>
>
> This is not ok. I can manually run 'modprobe nvidia-uvm' but it will
> last only for the current session.
>
>> If this is OK there need to be device special files for the vendor
>> specific library to communicate with your kernel drivers. You need to
>> see something like that:
>>
>> crw-rw----+ 1 root video 195, 0 24. Jul 18:28 /dev/nvidia0
>> crw-rw----+ 1 root video 195, 255 24. Jul 18:28 /dev/nvidiactl
>> crw-rw-rw- 1 root root 249, 0 24. Jul 18:28 /dev/nvidia-uvm
>>
>> Check that your account has write access to all of them. In my case
>> users who want to use OpenCL need to be member of group video.
>>
>
> I'm missing nvidia-uvm. Who should create that device?
My system is not representative in that my primary GPU is an AMD which
also runs X11 and my nvidia card is used only as a secondary device for
GPGPU. That means I need to make sure manually that kernel modules
nvidia and nvidia-uvm get loaded at boot time. I do this by adding those
two kernels to the list of kernels to be automatically loaded (in
/etc/sysconfig/kernel on my opensuse system).
In order to create the device special files I have the following line in
/etc/modprobe.d/99-local.conf
install nvidia /sbin/modprobe --ignore-install nvidia && { /bin/sh
/etc/nvidia/nvidia-init.sh; }
And I have installed a script /etc/nvidia/nvidia-init.sh:
#!/bin/bash
# Count the number of NVIDIA controllers found.
N3D=`/sbin/lspci | grep -i NVIDIA | grep "3D controller" | wc -l`
NVGA=`/sbin/lspci | grep -i NVIDIA | grep "VGA compatible controller" |
wc -l`
N=`expr $N3D + $NVGA - 1`
for i in `seq 0 $N`; do
mknod -m 660 /dev/nvidia$i c 195 $i;
chown root.video /dev/nvidia$i
done
mknod -m 660 /dev/nvidiactl c 195 255
chown root.video /dev/nvidiactl
mknod -m 666 /dev/nvidia-uvm c 249 0
chown root.root /dev/nvidia-uvm
As said all this is primarily needed because my nvidia card is a
secondary gpu. Normally all this should be done automatically while your
X11 starts up.
Ulrich
> I'm still affected by this bug?
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=746643
>
>
>> @Federico:
>>
>> The error number -1001 from your system tells that even though you have
>> libOpenCL.so one of the other requirements above were not met.
>>
>> Ulrich
>
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