Backlight is not restored to proper brightness after xset dpms force off

[nandhp]

Binary package hint: x11-xserver-utils

After I reopen the lid on my laptop or press a key after running "xset dpms force off", the screen backlight is at minimum brightness (20%, according to /proc/acpi/video/VID/LCD0/brightness). If I press the Fn+PgUp key to increase brightness, it immediately proceeds to ProperBrightness+1.

I have a Lenovo Thinkpad T500, running up-to-date Ubuntu Intrepid 8.10. I do not recall this problem occurring when I first installed Ubuntu on this computer in mid-January.

ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 8.10
Package: x11-xserver-utils 7.3+5
ProcEnviron:
 PATH=/home/username/perl:/home/username/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/lib/xscreensaver
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: x11-xserver-utils
Uname: Linux 2.6.27-11-generic i686