Bug#673424: bbswitch packaging
On Mon, Mar 18, 2013 at 6:50 AM, Ritesh Raj Sarraf <rrs@researchut.com> wrote:
> On Monday 18 March 2013 01:15 PM, Vincent Cheng wrote:
>> Try testing with:
>> # apt-get install mesa-utils
>> $ optirun -b primus glxgears -info
>> $ primusrun glxgears -info
>
> Okay!! I got uniform results but I had to again uncomment the following
> line. Without it, it was running on the Intel card.
>
> # Need functions from primus libGL to take precedence
> export LD_LIBRARY_PATH=${PRIMUS_libGL}${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
That line was already uncommented out in the script shipped by the package...
>>> > Where as, if you run optirun (or -b primus), you will notice it running
>>> > on nvidia.
>>> >
>>> > Easiest way to verify this is to watch /proc/acpi/bbswitch when using
>>> > either of the interface.
>> That's not reliable way of verifying this because you can force the
>> secondary X server to be permanently on, and running on your nvidia
>> GPU. It's as simple as
>> s/KeepUnusedXServer=false/KeepUnusedXServer=true/ in
>> /etc/bumblebee/bumblebee.conf, or "optirun bash".
> Yes. But I have ensure always that I review the config file. And in my
> opinion, the defaults should be KeepUnusedXServer=false
I suppose a better way of explaining why watching /proc/acpi/bbswitch
isn't reliable is by referencing the differences between how the
virtualgl and primus backends work. Virtualgl will always cause the
secondary X server to be spawned (everything is rendered on the
secondary X server before being displayed on the primary X server),
whereas primus will only offload glx calls to bumblebee, thus the
secondary X server will only start up when you run some sort of opengl
application with primus. That means that "optirun bash" or "optirun
xterm" will invariably turn on the secondary X server and the nvidia
gpu, whereas "primusrun bash" or "primusrun xterm" (or some other
application that doesn't use any glx calls) will not.
> I will try to update all the packages now and see the final results.
> Looks like you guys have pushed some updates today.
Please do test out my changes, but also please don't upload the
packages yet. I want to sort out the conffiles issue [1] first...
Regards,
Vincent
[1] http://lists.alioth.debian.org/pipermail/pkg-nvidia-devel/2013-March/008565.html
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