I had the same problem with my Aspire V5-171 (Ubuntu 13.04). I tried adding "acpi_backlight=vendor" as it solved this problem in Ubuntu 12.10, but for no avail.
Then I tried this other fix: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_backlight=vendor" and after updating grub and rebooting the brightness control and Fn keys work like a charm, even better than in 12.04, considering now I can decrease the brightness to a lower level. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1172945 Title: Acer Aspire 5742G brightness Fn keys doesn't change brightness To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1172945/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
