On Mon, 29 Oct 2012 17:11:53 Jens Fendler wrote:
> Hi all,
> 
> I just got a new laptop, which I would like to use for DT processing. 
> One problem, however, seems to be the NVidia Optimus graphics card, 
> which gives me problems with the OpenCL acceleration in darktable. 
> Everything else I've tried so far sems to work fine with bumblebee's 
> "optirun". (Though I haven't yet tried any other OpenCL apps yet).

I also have a #*@$ Optimus laptop and have no trouble with compiling and 
running dt via optirun.

But when I do a yum update I often have trouble when *nvidia* modules are 
updated. I overcome this by following some of the instructions on 
http://duxyng.wordpress.com/2012/01/26/finally-working-nvidia-optimus-on-
fedora-16/ . Specifically:

1) rm -rf /etc/X11/xorg.conf /etc/X11/xorg.conf.d/00-nvidia.conf 
/etc/modprobe.d/blacklist-nouveau
2) Remove "nouveau.modeset=0 rd.driver.blacklist=nouveau" kernel parameters 
from /etc/grub2.cfg for the current kernel
3) rm /etc/ld.so.conf.d/nvidia-lib64.conf; ldconfig
4) rm -rf /usr/lib64/xorg/nvidia
5) mv /usr/lib64/xorg/modules/extensions/nvidia /usr/lib64/xorg

Maybe one, or more, of the above could help.

Kevin

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