The problem with brightness is still present after upgrade to 11.04. I found these entries (location has changed): /sys/class/backlight/acpi_video0/actual_brightness /sys/class/backlight/acpi_video0/brightness
Both seem to follow the intended brightness, but the backlight only follows the FN-left and FN-rigth keys. The brightness seems to change in steps of two. If I echo a value of 9 to brightness nothing happens to the backlight. But if I use the FN-right (increase) just once the backlight jumps to the maximum. It looks like the FN keys "apply" the value that are present in these registers. I also ran fwts which seems to indicate an issue with brightness value: FAILED [HIGH]: Test 1, HIGH Kernel message: [ 1641.158950] ACPI Error: Current brightness invalid (20110112/video-377) Report attached. Any advice on how to fix this would be very helpfull (kernel commandline option?) ** Attachment added: "fwts output log" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/706303/+attachment/2175250/+files/results.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/706303 Title: LCD screen brightness is not adapted on AC/Battery state change To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/706303/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
