Re: rt kernel and nouveau
On 2012-03-22 12:59 +0100, Jon Dowland wrote:
> On Wed, Mar 21, 2012 at 11:39:51PM -0700, daniel jimenez wrote:
>> Hello everyone,
>>
>> I'm trying to get an rt kernel working in debian testing on an amd64 laptop
>> with nvidia graphics.
>>
>> Ideally I'd have nouveau set up to start when I select (in grub) the rt
>> kernel and the nvidia drivers when choosing the regular kernel. Problem is,
>> I don't know how to do that...
>>
>> Any help appreciated.
>
> You can prevent the loading of a module on the kernel command line, so e.g.
>
> kernel /foo.rt nvidia.blacklist=yes
>
> Will prevent the nvidia kernel module from loading. This will hopefully
> mean the nouveau one will win the race,
Unless nouveau is blacklisted as well, which is the case if the
nvidia-kernel-common package is installed. I would prefer not to
blacklist anything and boot the non-rt kernel with the 'nomodeset'
parameter.
> and X will use whatever driver corresponds to what the kernel has
> loaded.
Not true, nvidia is never autoloaded, so you need at least a 4-line
xorg.conf. And it is also necessary to switch the providers of
/usr/lib/$DEB_HOST_MULTIARCH/libGL.so.1 and
/usr/lib/xorg/modules/extensions/libglx.so, otherwise OpenGL programs
will not run.
All doable with a custom initscript, but quite some hassle.
> Getting grub2 to use a different command-line option for each entry left
> as an exercise for the reader.
I ended up locally diverting /usr/sbin/update-grub (replacing it with a
symlink to /bin/true) and managing /boot/grub/grub.cfg by hand.
Cheers,
Sven
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