[SOLVED] Can't Change Brightness on Intel VGA

Hey,
I can't change brightness, either from the buttons on laptop or the slider in power management (default KDE applet). When I try it, the OSD shows brightness changing but there is no actual change of brightness.
Some info about my laptop:
It's HP Probook 4540s, which has Intel and ATI Radeo hybrid/dual VGA cards. After reading https://wiki.archlinux.org/index.php/Hybrid_graphics , I disabled my discrete (ATI) graphic card from BIOS, now:
$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
Though, I couldn't change the brightness when I hadn't disabled ATI card either. I also have both xf86-video-ati and xf86-video-intel installed.
Any suggestions?
Edit: Updated thread title.
Last edited by aqeeliz (2013-06-10 15:22:00)

WonderWoofy wrote:
In any case, I have the same hardware according to lspci, and I have to use acpi_osi="!Windows 2012" on the kernel command line.  Some people report that using acpi_osi=Linux works as well.  acpi_backlight=vendor somewhat improves the situation, but apparently this is very very strongly discouraged by the acpi people.
If you try the not-windows acpi_osi parameter, you need to make sure you adhere to your bootloader's way of handling double quotes.  If it is grub2, you can simply escape them with backslashes... so it would be acpi_osi=\"!Windows 2012\".  You might also have to escape the ! as well, but I can't remember, as I don't actually use grub2.  The one that is particularly odd is rEFInd though, as it specifies the use of double double-quotes.
By kernel command line, I am assuming you mean the 'linux' line in grub boot list.
I tried both acpi_osi=\"!Windows 2012\" and acpi_osi=Linux, neither worked. I added them after ro quiet, and pressed F10 to boot, it should boot with the edited entry, right?
Also, there are lots of repetitions of the following messages in dmesg, not sure if they were present before too, or are just appearing after adding that !Windows:
[ 8427.949528] atkbd serio0: Unknown key pressed (translated set 2, code 0xa7 on isa0060/serio0).
[ 8427.949537] atkbd serio0: Use 'setkeycodes e027 <keycode>' to make it known.
As far as I can figure out, they are for each time I press the Fn+brightness-low/brightnes-high key, or move the brightness slider in applet.

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