I can confirm this bug on my Lenovo ThinkPad T60
Suggested cause:
Using /sys/class/backlight/* to control the brightness rather than
/proc/acpi/ibm/brightness
Suggested Solution:
Use the ibm section of
/usr/lib/hal/scripts/linux/hal-system-lcd-{get,set}-brightness-linux rather
than the "we have /sys/class/backlight" section. This, in turn, uses
/proc/acpi/ibm/brightness.
I've attached a little work around that I figured out. It changes the
keys/values in the Backlight entry of hal so that hal uses the ibm
section. It is an alteration to the file found at
/usr/share/hal/fdi/information/10freedesktop/10-laptop-panel-
hardware.fdi
Does this work for anyone else?
Also, I'm not familiar with the syntax of the FDI files. I just set the
linux.sysfs_path to an empty string. What's the syntax to have it
removed?
** Attachment added: "10-laptop-panel-hardware.fdi"
http://launchpadlibrarian.net/10463570/10-laptop-panel-hardware.fdi
** Also affects: hal (Ubuntu)
Importance: Undecided
Status: New
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Rediculous number of software brightness steps. 18 vs. 8 before on ThinkPad
https://bugs.launchpad.net/bugs/149780
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