brightness intermittent up and down after login

Binary package hint: hal

Package: hal
Version: 0.5.9.1-6ubuntu5
Severity: normal

--- Please enter the report below this line. ---

--- System information. ---
Architecture: i386
Kernel: Linux 2.6.22-14-generic

Debian Release: lenny/sid
  500 gutsy-updates de.archive.ubuntu.com
  500 gutsy-security security.ubuntu.com
  500 gutsy de.archive.ubuntu.com

--- Package information. ---
Depends (Version) | Installed
==========================================-+-======================
libc6 (>= 2.6-1) | 2.6.1-1ubuntu9
libdbus-1-3 (>= 1.1.1) | 1.1.1-3ubuntu4
libdbus-glib-1-2 (>= 0.74) | 0.74-1
libexpat1 (>= 1.95.8) | 1.95.8-4ubuntu1
libglib2.0-0 (>= 2.14.0) | 2.14.1-1ubuntu1
libhal-storage1 | 0.5.9.1-6ubuntu5
libhal1 (>= 0.5) | 0.5.9.1-6ubuntu5
libusb-0.1-4 (>= 2:0.1.12) | 2:0.1.12-7
zlib1g (>= 1:1.2.3.3.dfsg-1) | 1:1.2.3.3.dfsg-5ubuntu2
adduser | 3.103ubuntu1
pciutils | 1:2.2.4-1ubuntu2
usbutils | 0.72-8ubuntu1
udev (>= 0.065) | 113-0ubuntu16
dbus (>= 0.60-1) | 1.1.1-3ubuntu4
lsb-base | 3.1-23.1ubuntu3
hal-info (>= 20070402) | 20070618-1ubuntu3

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After login at gdm brightness of my laptop goes intermittent up and down.
I can stop it with /etc/init.d/hal restart

Not sure if it is related to hal or gnome.