Adding 'acpi_backlight=vendor' to the GRUB_CMDLINE_LINUX_DEFAULT options
in /etc/default/grub (comment #71) also worked for me. 'quiet splash'
and 'pcie_aspm=force' options shouldn't be necessary in this situation
(though 'quiet splash' is added by default). Also, as a general rule,
you should check what commands do before blindly following solutions
followed by others. Google is your friend. ; )
$ uname -a
Linux Mazinger-Z 3.5.0-22-generic #34-Ubuntu SMP Tue Jan 8 21:47:00 UTC 2013
x86_64 x86_64 x86_64 GNU/Linux
$ sudo lshw -class system
mazinger-z
description: Portable Computer
product: Inspiron N5010 (To be filled by O.E.M.)
vendor: Dell Inc.
version: A04
serial: 1D04FL1
width: 64 bits
capabilities: smbios-2.6 dmi-2.6 vsyscall32
configuration: boot=normal chassis=portable sku=To be filled by O.E.M.
uuid=44454C4C-4400-1030-8034-B1C04F464C31
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https://bugs.launchpad.net/bugs/1007765
Title:
brightness adjusting crashes system
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