Screen brightness applet (laptops) doesn't work with any mouse clicks

Binary package hint: xorg

I've added the screen brightness applet on the taskbar (sorry, I'm new from Windows) and when I click on the applet, it gives a pop up menu.

That's fine.

But if I try clicking on either the + or - buttons, or try to drag the slider, it vanishes immediately - not letting me do anything.

Sometimes when I click on the widget again, I don't get the pop up immediately below; it's moved either slightly to the right, or to the extreme left (edge of the screen, still visible, below the Ubuntu menu buttons).

Using the keyboard's up/down/page up/page down keys is the only way.

Moreover, the FN+F10 and FN+F11 keys don't work on the Lenovo 3000 V200. I'm not sure if a driver will fix that - cause most of the other FN keys work fine.

ProblemType: Bug
Architecture: amd64
Date: Sat Mar 20 23:33:23 2010
DistroRelease: Ubuntu 10.04
DkmsStatus: Error: [Errno 2] No such file or directory
GdmLog1: Error: command ['gksu', '-D', 'Apport', '--', 'cat', '/var/log/gdm/:0.log.1'] failed with exit code 1: cat: /var/log/gdm/:0.log.1: No such file or directory
GdmLog2: Error: command ['gksu', '-D', 'Apport', '--', 'cat', '/var/log/gdm/:0.log.2'] failed with exit code 1: cat: /var/log/gdm/:0.log.2: No such file or directory
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta amd64 (20100318)
MachineType: LENOVO 076432G
Package: xorg 1:7.5+3ubuntu1
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-16-generic root=UUID=d77d85d8-f2e7-49df-b9ba-50d397bbf91a ro quiet splash
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-16.25-generic
SourcePackage: xorg
Symptom: display
Uname: Linux 2.6.32-16-generic x86_64
dmi.bios.date: 06/10/2008
dmi.bios.vendor: LENOVO
dmi.bios.version: 65ET60WW (0.11 )
dmi.board.name: INVALID
dmi.board.vendor: LENOVO
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnLENOVO:bvr65ET60WW(0.11):bd06/10/2008:svnLENOVO:pn076432G:pvrLENOVO3000V200:rvnLENOVO:rnINVALID:rvrNotApplicable:cvnLENOVO:ct10:cvrN/A:
dmi.product.name: 076432G
dmi.product.version: LENOVO3000 V200
dmi.sys.vendor: LENOVO
glxinfo: Error: [Errno 2] No such file or directory
system:
 distro: Ubuntu
 codename: lucid
 architecture: x86_64
 kernel: 2.6.32-16-generic