I just got a brand new Thinkpad E145 and had the same problem after a new install of ubuntu-gnome 14.04 (BIOS 2.02).
After trying out all possible combinations of kernel parameters and drivers I finally found a solution that worked for me. I had to disable the fglrx drivers and use the X org xserver driver. Then I used the kernel parameters (/etc/default/grub): GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor video.use_native_backlight=1" "quiet splash" was set by standard. I tried also acpi_osi options but with these options I couldn't get it running. The backlight then appears as /sys/class/backlight/radeon_bl0/ and can be changed by setting the level in the brightness file in that folder (0-255). When I had fglrx running, I had the impression the driver over ruled the brightness setting, it always reverted back to a standard value. It is not a perfect solution, I would prefer being capable of using fglrx but for now I can live with it. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to fglrx-installer in Ubuntu. https://bugs.launchpad.net/bugs/1318314 Title: brightness adjustment does not work on Thinkpad E145 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/fglrx-installer/+bug/1318314/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
