Re: nouveau vs nvidia - fresh install, nouveau wins

On Wed, May 4, 2011 at 1:13 AM, Axel Thimm <[email protected]> wrote:
> On Wed, 2011-05-04 at 00:26 -0700, Fedor Pikus wrote:
>> On Wed, May 4, 2011 at 12:11 AM, Axel Thimm <[email protected]> wrote:
>> > On Tue, 2011-05-03 at 20:36 -0700, Fedor Pikus wrote:
>> >> The NVidia RPM is configured to blacklist nouveau, which usually does
>> >> the job of removing it. But recently I ran into the case where it does
>> >> not work. It goes like this:
>> >> 1) Do fresh install of F14 (may be others, but that's all I tried).
>> >> 2) During install, configure F14 update repos
>> >> 3) After install, add ATRPM repos and install NVidia drivers
>> >>
>> >> NVidia module does not load, lsmod shows that nouveau is there.
>> >> Blacklist does not help, blacklisting nouveau on the boot line does
>> >> not help,
>> >
>> > Have you tried nouveau.modeset=0?
>>
>> Yes, tried that and rdblacklist=nouveau. I think the problem is that
>> initrd is built during the install and is configured for
>> high-resolution text modes, and all modules in initrd are loaded even
>> if they are later not used.
>
> I thought these commands would prevent the loading of nouveau from
> initrd/initram.
>
> Try booting into mode 3 or mode 1 and see if the nouveau driver has been
> loaded (lsmod | grep nouveau). BTW you need both the nouveau.modeset=0

That's how I tracked it to initrd, I booted "single" and nouveau was
there, that's before most things are loaded. Well, that, and removing
nouveau.ko.

> setting *and* the blacklisting at modprobe level, e.g. nouveau needs
> blacklisting at two levels.

When it's not in initrd, blacklist in modprobe.conf is sufficient.
When it's in initrd, it just gets force-loaded on boot.

>
> I have the above kernel command line option and blacklist nouveau
> in /etc/modprobe.d/nvidia.conf and didn't have a nouveau/nvidia clash
> since ever.
>
>> So I may be able to rmmod nouveau if I disable graphical boot, and
>> then load nvidia, but it requires manual intervention (and does not
>> seem reliable, sometimes nouveau remains with refcount one even when
>> lsmod shows no uses of it).
> --
> http://thimm.gr/ - http://ATrpms.net/
>
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-- 
Fedor G Pikus ([email protected])
http://www.pikus.net
http://wild-light.com