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The Mountain Man
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Joined: 03 Sep 2003
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 Posted: Wed Aug 31, 2005 1:25 am Post subject: Serious problems after switching to udev *** FIXED *** |
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I followed the instructions here, I unemerged "devfsd", and now I'm encountering some rather unfortunate problems.
First of all, startx says it "Cannot open device /dev/mouse". I can create a link easily enough with "ln -s /dev/input/mouse0 /dev/mouse" and then I can startx, but the link won't stay when I reboot.
Secondly, kdm (the KDE login manager) won't start. If I type "kdm" in a root console, nothing happens. No errors, no messages, nothing. If I try and start KDE with "startkde", I get various error messages telling me that it is "unable to open display "" " (note the double quotes).
Strangely enough, I can start KDE from within the xsession -- it seems to have sort of started up underneith or something...very weird.
Other than that, everything seems to be working fine. Anyway, does anybody have any clue how I can fix my system? Thanks.
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Last edited by The Mountain Man on Mon Sep 05, 2005 3:23 pm; edited 1 time in total |
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mikecore
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Joined: 29 Dec 2003
Posts: 342
Location: Toledo, Ohio
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| Posted: Wed Aug 31, 2005 1:45 am Post subject: The instructions you followed |
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| The Instructions you followed show that you have to edit some files. But it dosn't say how to edit them so I would guess you need to know how to properly edit them. Did you edit these files and if so did you do it correctly. |
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The Mountain Man
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Joined: 03 Sep 2003
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| Posted: Wed Aug 31, 2005 1:56 am Post subject: |
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Good question. In /etc/conf.d/rc, I find this:
| Code: | # Use this variable to control the /dev management behavior.
# auto - let the scripts figure out what's best at boot
# devfs - use devfs (requires sys-fs/devfsd)
# udev - use udev (requires sys-fs/udev)
# static - let the user manage /dev
RC_DEVICES="auto" |
I left it as "auto". I also tried "udev", but that didn't improve the situation.
/etc/udev/ has a file named udev.conf which looks like this:
| Code: | # /etc/udev/udev.conf: main config file for udev
# $Header: /var/cvsroot/gentoo-x86/sys-fs/udev/files/udev.conf.post_050,v 1.1 2005/02/04 03:07:19 gregkh Exp $
#
# This file can be used to override some of udev's default values
# for where it looks for files, and where it places device nodes.
# udev_root - where in the filesystem to place the device nodes
udev_root="/dev/"
# udev_db - The name and location of the udev database.
# NOTE: this should be somewhere that is writable before
# / is mounted rw, like /dev ...
udev_db="/dev/.udevdb"
# udev_rules - The name and location of the udev rules file
udev_rules="/etc/udev/rules.d/"
# default_mode - set the default mode for all nodes that have no
# explicit match in the permissions file
# NOTE: do not set to anything else if you are not
# sure you have everything needed for normal
# user to function in the permissions file!
default_mode="0660"
# udev_log - set to "yes" if you want logging
udev_log="no" |
I couldn't see anything to change, so I left this one alone.
Anyway, as a temporary fix, I recompiled my kernel with devfs support and devfs automount and removed "nodevfs udev devfs=nomount" from grub.conf which at least lets me start KDE, though I now have those annoying "error unlinking" messages at boot time, which is what I was trying to get rid of in the first place. 
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steve_d555
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Joined: 07 Nov 2004
Posts: 458
Location: Belmont, Massachusetts
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| Posted: Wed Aug 31, 2005 2:30 am Post subject: |
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To change the startx problem you can just edit you xorg.conf and change /dev/mouse to /dev/input/mouse0.
The KDE thing I have no idea about however.
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Raistlin
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Joined: 17 May 2004
Posts: 691
Location: Boston, MA
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| Posted: Wed Aug 31, 2005 7:11 am Post subject: |
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Hi,
why not create a device /dev/mouse?
How? That way:
Let's take my notebook installation as an example. My Thinkpad has a touchpad, a trackpoint and sometimes a usb mouse plugged in. I found that really annoying, to reference it in xorg.conf through mouse0, mouse1, etc. Therefore I wrote some simple udev rules.
You can either add it to | Code: | | /etc/udev/rules.d/50-udev.rules |
or create a new file. For example | Code: | | /etc/udev/rules.d/10-udev.rules |
The files are parsed in alphabetical order. I did the latter (10-udev...)
So, let's get concrete:
| Code: | #Usb Mouse
BUS="usb", KERNEL="mouse*", SYSFS{dev}="13:34", NAME="input/%k", SYMLINK="usbmouse"
#Thinkpad Trackpoint
KERNEL="mouse1", SYSFS{dev}="13:33", NAME="input/%k", SYMLINK="trackpoint"
#Thinkpad Touchpad
KERNEL="event1", SYSFS{dev}="13:65", NAME="input/%k", SYMLINK="touchpad"
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I figured out the SYSFS{...} matching part with a helping hand from - You might do the same. These rules create the following simlinks, while they also add the "default" device nodes (the NAME="..." part): | Code: | /dev/usbmouse
/dev/trackpoint
/dev/touchpad |
Because the usb mouse isn't always plugged in, one should not declare it as the core pointer, but rather send core events (in xorg.conf) | Code: |
InputDevice "Trackpoint" "CorePointer"
InputDevice "USBMouse" "SendCoreEvents"
InputDevice "Touchpad" "SendCoreEvents"
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This will always work, because I hopefully ( ) never ever plug out my trackpoint 
Hth.
Cheers, R.
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The Mountain Man
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Joined: 03 Sep 2003
Posts: 643
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| Posted: Mon Sep 05, 2005 3:25 pm Post subject: |
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Well, I tried installing udev again, but the only thing I did differently was change xorg.conf so that it points to /dev/input/mice, and now everything works perfectly. Not sure why it didn't work the first time. I'll try your advice above just so I don't screw myself in the future.
Thanks!
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