Hi,

xbacklight is broken as of 2.6.28 on my ThinkPad X61s. It works with
2.6.27(.8) The difference I can see between both kernels is that 2.6.27
has 2 backlight ACPI devices, whereas 2.6.28 only has one device.  With
2.6.28, I can use xbacklight and see the values change in xbacklight
-get, but the actual display brightness doesn't change.

Attached are 2 files with diagnostic output from 2.6.27 and 2.6.28. Any
hints how to solve or debug this?

Regards,
Tino