Have you tried the following?
1. Add "options thinkpad_acpi brightness_enable=1" to
/etc/modprobe.d/acpi-video.conf
2. Update the initrd "sudo update-initramfs -u"
3. Add "acpi_backlight=vendor" to the kernel commandline (in
/boot/grub/menu.lst)
But regardless of this, could you please attach the output of "sudo
acpidump -o acpidump.txt" to this bug with a short comment to which
Thinkpad it belongs. Thanks.
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Stefan Bader (stefan-bader-canonical)
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regression: linux-image 2.6.28-15.51 in jaunty-proposed breaks brightness
control of T500
https://bugs.launchpad.net/bugs/423296
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