I have an Acer Aspire 3935 with exactly the same hardware. And I also have the same problems.
For now, I found out that writing a brightness value to /sys/class/backlight/acpi_video0/brightness saves the brightness (you can see it in actual_brightness). It is even saved until the next reboot - when I set the brightness to 0 and reboot, the display is very dark when BIOS starts. While BIOS and GRUB are running, I can change the brightness with Fn keys. But as soon as Linux has initialised ACPI, the keys have no longer any function. When I turn off ACPI (acpi=off in kernel command line), brightness control works but of course everything requiring ACPI (like CPUfreq control or battery status) works no longer! Best regards, Freddy -- Changing brightness does not work on HP 6530b https://bugs.launchpad.net/bugs/286599 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
