Arch Linux

Do you have an active (i.e. uncommented) xorg.conf entry for the keyboard and hotplugging enabled as well? Because it is possible that the driver is loaded twice and this causes problems.

See this discussion:debian-bugs-dist@lists.debian.org/msg586329.html"> http://www.mail-archive.com/debian-bugs-dist@lists.debian.org/msg586329.html
And this commit which fixes this issue: http://cgit.freedesktop.org/xorg/driver/xf86-input-evdev/commit/?id=63af314368cec47b6b8266db331f2c820e7a071f

That commit is already in the 2.1.0 final version if I can trust git for this.

Can you attach xorg.conf and Xorg.0.log?

I commented out my keyboard entry as Fillip suggested, the problem still shows

Your problem is this section.

Section "ServerFlags"
Option "AllowEmptyInput" "false"
EndSection

You need to comment that out.

Err oh sorry... Shem's advice fixes it for me.

I'm having problems with archlinux, but ubuntu is working fine. This is the output of "setxkbmap -print" in archlinux:

xkb_keymap {
xkb_keycodes { include "evdev+aliases(qwerty)" };
xkb_types { include "complete" };
xkb_compat { include "complete" };
xkb_symbols { include "pc+br(abnt2)+inet(evdev)+br(thinkpad):2+level3(ralt_switch_for_alts_toggle):1+level3(ralt_switch_for_alts_toggle):2+group(alts_toggle)" };
xkb_geometry { include "pc(pc104)" };
};

And this is the output in Ubuntu:

xkb_keymap {
xkb_keycodes { include "evdev(abnt2)+aliases(qwerty)" };
xkb_types { include "complete" };
xkb_compat { include "complete" };
xkb_symbols { include "pc+br(thinkpad)+inet(evdev)" };
xkb_geometry { include "pc(abnt2)" };
};

Ubuntu uses the following config in /etc/default/console-setup to set up the correct keyboard in xorg.conf:
# The following variables describe your keyboard and can have the same
# values as the XkbModel, XkbLayout, XkbVariant and XkbOptions options
# in /etc/X11/xorg.conf.
XKBMODEL="abnt2"
XKBLAYOUT="br"
XKBVARIANT="thinkpad"
XKBOPTIONS=""

How can I use my keyboard in archlinux?

This is /var/log/Xorg.0.log in Ubuntu (where it works):

(II) config/hal: Adding input device AT Translated Set 2 keyboard
(**) AT Translated Set 2 keyboard: always reports core events
(**) AT Translated Set 2 keyboard: Device: "/dev/input/event1"
(II) AT Translated Set 2 keyboard: Found keys
(II) AT Translated Set 2 keyboard: Configuring as keyboard
(II) XINPUT: Adding extended input device "AT Translated Set 2 keyboard" (type:$
(**) Option "xkb_rules" "evdev"
(**) AT Translated Set 2 keyboard: xkb_rules: "evdev"
(**) Option "xkb_model" "abnt2"
(**) AT Translated Set 2 keyboard: xkb_model: "abnt2"
(**) Option "xkb_layout" "br"
(**) AT Translated Set 2 keyboard: xkb_layout: "br"
(**) Option "xkb_variant" "thinkpad"
(**) AT Translated Set 2 keyboard: xkb_variant: "thinkpad"

In archlinux, it is:

(II) config/hal: Adding input device AT Translated Set 2 keyboard
(**) AT Translated Set 2 keyboard: always reports core events
(**) AT Translated Set 2 keyboard: Device: "/dev/input/event1"
(II) AT Translated Set 2 keyboard: Found keys
(II) AT Translated Set 2 keyboard: Configuring as keyboard
(II) XINPUT: Adding extended input device "AT Translated Set 2 keyboard" (type:$
(**) Option "xkb_rules" "base"
(**) AT Translated Set 2 keyboard: xkb_rules: "base"
(**) Option "xkb_model" "evdev"
(**) AT Translated Set 2 keyboard: xkb_model: "evdev"
(**) Option "xkb_layout" "us"
(**) AT Translated Set 2 keyboard: xkb_layout: "us"

I've also checked 10-keymap.fdi, and both distros have the same file. I wish I could go back to Arch soon :-(

Carlos, you should have read the wiki article linked to from xorg-server-1.5-3's post_install.