*** This bug is a duplicate of bug 351586 ***
https://bugs.launchpad.net/bugs/351586
Thanks for testing and confirming.
Here's some stuff to try:
(from bug #399675)
A workaround is unloading/reloading the "video" kernel module, but
after this the brightness-changing-OSD doesn't appear anymore and I
guess there may be other issues, at least it's not the elegant way ;)
@amol (the SL300 owner):
see the following links. If you can try their workarounds, post back here.
http://ubuntuforums.org/showthread.php?t=1137682&highlight=sl500+brightness
http://gianlucamagalotti.wordpress.com/2009/02/16/lenovo-thinkpad-sl-series-hotkeys/
http://ubuntuforums.org/showthread.php?t=1150002
If any of these work, it looks like a kernel problem (acpi), so we can
assign to linux (Ubuntu).
** Summary changed:
- Laptop brightness control problems
+ Lenovo laptop brightness control problems (3000 100N and SL300)
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Lenovo laptop brightness control problems (3000 100N and SL300)
https://bugs.launchpad.net/bugs/369777
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