How is monitor brightness is controlled ?

[Yevgen Krapiva]

Hi everyone.

Could somebody tell me what thing in FreeBSD is managing the monitor
brightess ?

I've got Dell Inspiron laptop, FreeBSD 9.0 RELEASE and KDE4.
Pressing the functional combintation of Fn+F4/F5 does not have any effect.
In order to understand what's wrong I need to know in what direction I
should move.

Thanks a lot.

Some system configuration details:

FreeBSD devel-pc 9.0-RELEASE FreeBSD 9.0-RELEASE #0: Fri Apr 27 15:19:53
EEST 2012
root at devel-pc:/usr/obj/usr/src/sys/GENERIC amd64

Xorg: 7.5.2
kde4: 4.7.3
xf86-video-intel: 2.17.0

devel-pc# kldstat
Id Refs Address Size Name
1 54 0xffffffff80200000 11d2570 kernel
2 1 0xffffffff81612000 1582 fdescfs.ko
3 1 0xffffffff81614000 42a7 linprocfs.ko
4 1 0xffffffff81619000 1e1cb linux.ko
5 1 0xffffffff81638000 328d ng_ubt.ko
6 1 0xffffffff8163c000 8b3d ng_hci.ko
7 3 0xffffffff81645000 a79 ng_bluetooth.ko
8 5 0xffffffff81646000 8e12 netgraph.ko
9 1 0xffffffff8164f000 b4a2 ng_l2cap.ko
10 1 0xffffffff8165b000 1695e ng_btsocket.ko
11 1 0xffffffff81672000 1ba9 ng_socket.ko
12 1 0xffffffff81674000 a96b fuse.ko
13 1 0xffffffff8167f000 5f29b i915.ko
14 1 0xffffffff816df000 1241 iicbb.ko
15 4 0xffffffff816e1000 1307 iicbus.ko
16 1 0xffffffff816e3000 dc9 iic.ko
17 1 0xffffffff816e4000 2c4b2 drm.ko
18 1 0xffffffff81711000 248d acpi_video.ko