udev and parallel printer

udev and parallel printer

[Thomas Gufler]

Hello, 

I'm using udev-021 on a Gentoo system(pure udev, no device.tar.bz2, Linux 
2.6.4). I have two problems with udev:
First, udev doesn't create /dev/lp0 for my printer. Is support for /dev/lp0 
not implemented or is this my fault?
My second problem is with /dev/nvidia*. When I boot the first time after 
installing the nvidia kernel module (with sysfs support) a /dev/nvidia0 and 
a /dev/nvidiactl device is created, when I reboot again I don't get these 
entries. (nvidia kernel module is autoloaded via 
in /etc/modules.autoload.d/kernel-2.6).

Any suggestions?

Tom Gufler 


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Re: udev and parallel printer

[Greg KH]

On Sat, Mar 13, 2004 at 08:21:07PM +0100, Thomas Gufler wrote:
> Hello, 
> 
> I'm using udev-021 on a Gentoo system(pure udev, no device.tar.bz2, Linux 
> 2.6.4). I have two problems with udev:
> First, udev doesn't create /dev/lp0 for my printer. Is support for /dev/lp0 
> not implemented or is this my fault?

parallel port devices are not currently showing up in sysfs, so udev can
not name them at this time, sorry.

greg k-h


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Re: udev and parallel printer

[Alexander E. Patrakov]

On Sunday 14 March 2004 02:21, Greg KH wrote:

> parallel port devices are not currently showing up in sysfs, so udev can
> not name them at this time, sorry.

???

[patrakov in ~]$ ls -l /sys/class/printer/lp0
…‘œ«œ 0
-r--r--r--    1 root     root         4096 2004-03-14 08:46 dev
[patrakov in ~]$ cat /sys/class/printer/lp0/dev
6:0
[patrakov in ~]$ ls -l /dev/lp0
crw-rw----    1 root     lp         6,   0 2004-01-16 09:57 /dev/lp0

This is a 2.6.4 kernel, with the lp module loaded. So it seems that the OP has 
a "chicken-and-egg" problem because lp is a module that cannot be inserted by 
hotplug scripts.

Some time ago I posted a very simple solution, and it has been ignored. So I 
post it once again below.

A very good approximation to the list of modules not detectable by hotplug but 
still providing useful devices is given by the following command:

egrep '(char|block)-major' /lib/modules/`uname -r`/modules.alias | \
	awk '{print $3;}'

(please put old cdroms like sbpcd, watchdogs and ieee1394 stuff into a 
blacklist)

We just want to probe them all either in udev initstript or as an 
additional .rc file in /etc/hotplug.

-- 
Alexander E. Patrakov


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