On 02/20/2012 06:37 PM, Todd And Margo Chester wrote:
> On 02/19/2012 11:50 PM, Akemi Yagi wrote:
>> On Sun, Feb 19, 2012 at 8:14 PM, Todd And Margo Chester
>> <[log in to unmask]> wrote:
>>> Hi All,
>>>
>>> After the upgrade from hell (6.1 --> 6.2) and not being
>>> able to start X11, I found the following:
>>>
>>> The nvidia drivers (kmod-nvidia, nvidia-x11-drv) failed to
>>> open my display. So, I had to revert to the Nouveau
>>> (xorg-x11-drv-nouveau) drivers. Which, of course, I
>>> had to install the hard way.
>>>
>>> Has anyone got
>>>
>>> kmod-nvidia-295.20-1.el6.elrepo.x86_64.rpm
>>> nvidia-x11-drv-295.20-1.el6.elrepo.x86_64.rpm
>>> nvidia-x11-drv-32bit-295.20-1.el6.elrepo.x86_64.rpm
>>>
>>> to work on SL6.2 x64 successfully? And, if so, what/how did
>>> you do it?
>>
>> I have updated my machine from SL 6.1 to 6.2. Absolutely no problem with:
>>
>> $ rpm -qa | grep nvidia
>> kmod-nvidia-295.20-1.el6.elrepo.x86_64
>> nvidia-x11-drv-32bit-295.20-1.el6.elrepo.x86_64
>> nvidia-x11-drv-295.20-1.el6.elrepo.x86_64
>>
>> I did not do anything special. Just rebooted the system after the
>> update and that's all.
>>
>> Do you have any error message you can show? Like /var/log/Xorg.0.log
>> when X failed to start?
>>
>> Akemi
>>
>
> Hi Akemi,
>
> All of my Xorg.x.logs show the "nouveau" driver. I could
> not find one that was looking for my nvidia-x11-drv.
>
> I wonder if this thing in my kernel run line has anything
> to do with it: nouveau.modeset=0
>

The nvidia driver has to blacklist the nouveau driver to stop it loading 
- if the nouveau driver loads then the nvidia driver can't. If you want 
to revert to the nouveau driver then you must remove "nouveau.modeset=0 
rdblacklist=nouveau" from the boot line for that kernel in 
/boot/grub/grub.conf.

Those parameters were added by the nvidia package - uninstalling the 
nvidia package should also remove those lines thus reinstating the 
nouveau driver.

If you intend to run the nvidia drivers, try uninstalling and 
reinstalling them. Check your xorg.conf is loading the "nvidia" driver.