Re: udev vs nvidia

[MALET JL <malet.jean-luc@laposte.net>]

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Daniel Drake a écrit :

> If anyone is interested, I have solved the below issue. It turns out 
> that you are supposed to load the module before starting X (even 
> nvidia say so), and devfs did this automatically on bootup. So, the 
> nvidia module should be added to an autoload list, and this issue is 
> not a fault of udev/hotplug.
>
> Daniel
>
> Daniel Drake wrote:
>
>> Hi,
>>
>> Since switching to udev, I have had problems when starting X relating 
>> to nvidia drivers. I know this is a tricky situation, with the nvidia 
>> drivers being closed-source, nobody really knows how they work. If it 
>> seems likely that this problem is not udev-related, then please tell 
>> me, and I will go to nvidia instead.
>>
>> I'm not sure if this is even anything to do with udev. The only 
>> reason I suspect udev might be involved, is because of the existance 
>> of /dev nodes seems to play a part.
>>
>>
>> I am running nvidia drivers version 5336 with Martin Schlemmer's 
>> patch applied to make them export info into sysfs.
>> If I manually "modprobe nvidia", then I can see that the /dev/nvidia0 
>> and /dev/nvidiactl nodes are created. So at this stage it seems to be 
>> loaded.
>>
>>
>> Ignoring the above situation, on a normal bootup, the nvidia module 
>> is not loaded at the point where I "startx":
>>
>> # ls /dev/nvidia*
>> no such file or directory
>>
>> # startx
>> XFree86 Version 4.3.0
>> Release Date: 27 February 2003
>> [snip]
>> (==) Using config file: "/etc/X11/XF86Config"
>> Using vt 7
>> (EE) NVIDIA(0): Failed to initialize the NVIDIA kernel module!
>> (EE) NVIDIA(0):  *** Aborting ***
>> (EE) Screen(s) found, but none have a usable configuration.
>>
>> Fatal server error:
>> no screens found
>>
>> If I mknod the /dev/nvidia* nodes first, then X is able to start as 
>> normal. Also, strangely, if I "modprobe nvidia", and then "startx" 
>> then X starts as normal.
>>
>> I believe that this problem comes around because the /dev nodes are 
>> not created quickly enough.
>>
>> # modprobe nvidia && ls -l /dev/nv*
>> ls: /dev/nv*: No such file or directory
>>
>> # rmmod nvidia
>>
>> # modprobe nvidia && sleep 2 && ls -l /dev/nv*
>> crw-rw-rw-    1 root     video    195,   0 Feb 16 19:47 /dev/nvidia0
>> crw-rw-rw-    1 root     video    195, 255 Feb 16 19:47 /dev/nvidiactl
>>
>>
>> My theory is that X loads the "nvidia" module, and then immediately 
>> tries to initialize the display and whatever else. But as the nvidia* 
>> nodes arent in place, it dies.
>
>
>
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here is a solution :

jlm@Sorcerer:~$ cat /etc/udev/nvidia.sh
#!/bin/sh
mknod /dev/nvidia0 c 195 0 -m a+rw
mknod /dev/nvidia1 c 195 1 -m a+rw
mknod /dev/nvidia2 c 195 2 -m a+rw
mknod /dev/nvidia3 c 195 3 -m a+rw
mknod /dev/nvidia4 c 195 4 -m a+rw
mknod /dev/nvidia5 c 195 5 -m a+rw
mknod /dev/nvidia6 c 195 6 -m a+rw
mknod /dev/nvidia7 c 195 7 -m a+rw
mknod /dev/nvidiactl c 195 255 -m a+rw

jlm@Sorcerer:~$ cat  /etc/modprobe.conf
install ppp_generic     mknod /dev/ppp c 108 0 -m 0666 && modprobe 
--ignore-install ppp_generic;
install         nvidia                  /etc/udev/nvidia.sh && modprobe 
--ignore-install nvidia;
[...]



note that the same issue occurs with pppd

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