Even on new laptops (I'm using an X301) there is no /proc/acpi/ibm/brightness
The brightness is outside of the ibm-specific ACPI stuff and under each monitor, e.g. /proc/acpi/video/VID/LCD0/brightness There is a folder in 'VID' for each possible monitor output, including the built in LCD. Normally only the built-in LCD has adjustable brightness, but you could imagine that more that one monitor may have adjustable brightness in the future. cat /proc/acpi/video/VID/LCD0/brightness levels: 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 100 current: 75 cat /proc/acpi/video/VID/CRT0/brightness <not supported> The '/proc/acpi/video/VID/LCD0/brightness' value changes when using the brightness hot keys. It actually jumps two values until it runs out of values and then it change to the last value, e.g. moving up and down you can get to all 16 values but in a two-sweep sequence. 100 -> 85 -> 75- > 65 -> 55 -> 45 -> 35 -> 25 -> 20 -> 30 -> 40 -> 50 -> 60 -> 70 -> 80 -> 90 -> 100 -- No notification when sliding audio volume, muting volume, sliding LCD brightness on X31, X32, T60, R50e, T42, R52 https://bugs.launchpad.net/bugs/357673 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
