I have an aspire 7715 and I had the same problem. also that work around worked for me.
another note. adding acpi_backlight=video to the kernel command line makes the system aware of when the brightness changes, it still can't change it in software. acpi_backlight=vender the backlight keys still work but the os doesn't seem to see when you change the brightness. also software brightness control works in windows, for whatever that is worth. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/765438 Title: On startup, the backlight is off on laptop -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
