$ uname -a Linux ironhide 3.1.0-0301rc9-generic #201110050905 SMP Wed Oct 5 09:15:03 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
$ cat /proc/cmdline BOOT_IMAGE=/vmlinuz-3.1.0-0301rc9-generic root=/dev/mapper/ironhide-root ro quiet splash vt.handoff=7
$ xset s activate Result: same as 3.1.0-999-generic, no backlight controls, but also no display hang coming out of dpms.
$ uname -a generic #201110050905 SMP Wed Oct 5 09:15:03 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
Linux ironhide 3.1.0-0301rc9-
$ cat /proc/cmdline /vmlinuz- 3.1.0-0301rc9- generic root=/dev/ mapper/ ironhide- root ro quiet splash vt.handoff=7
BOOT_IMAGE=
$ xset s activate
Result: same as 3.1.0-999-generic, no backlight controls, but also no display hang coming out of dpms.