Arch Linux

Description:

When I switch to VT (e.g. by pressing CTRL+ALT+Fn) from an X display the screen goes dim. Switching back to X restores the original brightness if and only if it wasn't at maximum at the beginning; otherwise changing the backlight level using the brightness Fn keys does the work. Also, I can change brightness in a VT by writing to /sys/class/backlight/intel_backlight/brightness; so it seems more like an X11 issue, but I'm not really sure since I don't recall having this problem while using 3.12 kernel. Any tips for debugging this bug would be highly appreciated.

The laptop I'm using is a Samsung NP450R4E-X03CL.

These are the relevant packages I'm currently using:

local/xf86-input-evdev 2.9.0-1 (xorg-drivers xorg)
X.org evdev input driver
local/xf86-input-synaptics 1.8.0-1 (xorg-drivers xorg)
Synaptics driver for notebook touchpads
local/xf86-video-intel 2.99.912-2 (xorg-drivers xorg)
X.org Intel i810/i830/i915/945G/G965+ video drivers
local/xorg-bdftopcf 1.0.4-2 (xorg xorg-apps)
Convert X font from Bitmap Distribution Format to Portable Compiled Format
local/xorg-font-util 1.3.0-2 (xorg-fonts xorg)
X.Org font utilities
local/xorg-font-utils 7.6-4
Transitional package depending on xorg font utilities
local/xorg-fonts-alias 1.0.3-1
X.org font alias files
local/xorg-fonts-encodings 1.0.4-4 (xorg-fonts xorg)
X.org font encoding files
local/xorg-fonts-misc 1.0.1-3
X.org misc fonts
local/xorg-luit 1.1.1-2 (xorg xorg-apps)
Filter that can be run between an arbitrary application and a UTF-8 terminal
emulator
local/xorg-mkfontdir 1.0.7-2 (xorg xorg-apps)
Create an index of X font files in a directory
local/xorg-mkfontscale 1.1.1-1 (xorg-apps xorg)
Create an index of scalable font files for X
local/xorg-server 1.15.2-1 (xorg)
Xorg X server
local/xorg-server-common 1.15.2-1
Xorg server common files
local/xorg-setxkbmap 1.3.0-2 (xorg-apps xorg)
Set the keyboard using the X Keyboard Extension
local/xorg-xauth 1.0.9-1 (xorg-apps xorg)
X.Org authorization settings program
local/xorg-xhost 1.0.6-1 (xorg-apps xorg)
Server access control program for X
local/xorg-xinit 1.3.3-3
X.Org initialisation program
local/xorg-xkbcomp 1.2.4-2 (xorg-apps xorg)
X Keyboard description compiler
local/xorg-xmodmap 1.0.8-1 (xorg-apps xorg)
Utility for modifying keymaps and button mappings
local/xorg-xrdb 1.1.0-1 (xorg-apps xorg)
X server resource database utility
local/xorg-xset 1.2.3-1 (xorg-apps xorg)
User preference utility for X
local/linux 3.15.5-2 (base)
The Linux kernel and modules
local/linux-api-headers 3.14.1-1
Kernel headers sanitized for use in userspace
local/linux-firmware 20140603.a4f3bc0-1
Firmware files for Linux

Look at the attachments for more info.