If i'm booting with "nomodeset" then can't change Brightness/Login/Logout/Suspend/Resume ..etc. Accidentally booted once without "nomodeset" everything was working (Brightness/Login/Logout/Suspend/Resume).
I tried alot of fixes like "acpi_backlight=vendor" in kernel option, but without any success :-(
My system: Ubuntu 12.4.3 (64bit) On HP 250 (preinstalled with ubuntu)
lspci -nnk | grep -A5 VGA
00:02.0 VGA compatible controller [0300]: **Intel Corporation 3rd Gen Core processor Graphics Controller** [8086:0166] (rev 09)
Subsystem: Hewlett-Packard Company Device [103c:1854]
Kernel modules: i915
00:16.0 Communication controller [0780]: Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1 [8086:1e3a] (rev 04)
Subsystem: Hewlett-Packard Company Device [103c:1854]
Kernel driver in use: mei
Best