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System:    Host: AcerMini Kernel: 3.2.0-2-686-pae i686 (32 bit, gcc: 4.6.3)
           Desktop: KDE 4.7.4 (Qt 4.7.4) Distro: Debian GNU/Linux wheezy/sid
Machine:   System: Acer product: AOA150 version: 1
           Mobo: Acer model: N/A Bios: Acer version: v0.3310 date: 10/06/2008
CPU:       Single core Intel Atom CPU N270 (-HT-) cache: 512 KB flags: (nx sse sse2 sse3 ssse3) bmips: 3191.58
           Clock Speeds: 1: 800.00 MHz 2: 1600.00 MHz
Graphics:  Card: Intel Mobile 945GSE Express Integrated Graphics Controller bus-ID: 00:02.0
           X.org: 1.11.4 drivers: intel (unloaded: fbdev,vesa) tty size: 80x35 Advanced Data: N/A for root
Audio:     Card: Intel N10/ICH 7 Family High Definition Audio Controller driver: snd_hda_intel bus-ID: 00:1b.0
           Sound: Advanced Linux Sound Architecture ver: 1.0.24
Network:   Card-1: Realtek RTL8101E/RTL8102E PCI Express Fast Ethernet controller
           driver: r8169 ver: 2.3LK-NAPI port: 3000 bus-ID: 02:00.0
           IF: eth0 state: down mac: <filter>
           Card-2: Atheros AR242x / AR542x Wireless Network Adapter (PCI-Express) driver: ath5k bus-ID: 03:00.0
           IF: wlan0 state: up mac: <filter>
Drives:    HDD Total Size: 160.0GB (-) 1: /dev/sda Hitachi_HTS54321 160.0GB 40C
Partition: ID: / size: 148G used: 6.4G (5%) fs: ext4 ID: swap-1 size: 1.50GB used: 0.00GB (0%) fs: swap
Sensors:   System Temperatures: cpu: 54.0C mobo: N/A
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 152 Uptime: 5 min Memory: 389.2/996.6MB Runlevel: 5 Gcc sys: N/A Client: Shell inxi: 1.7.31

To my knowledge all necessary packages for it to work are installed, mainly virtuoso-minimal.
If I right-click on Nepomuk icon in system tray I get option to uncheck "Suspend File Indexing", and strigi service goes to idle, but I must do that on each reboot.
Also, normal behaviour is for the icon to disappear after a while, but it stays there until right-click.

file indexing is enabled in systemsettings -> desktop search -> basic settings (gotta ask)

also look at ~/.kde/share/config/nepomukserverrc, though they should be consistant

[Service-nepomukfileindexer]
autostart=true

Thanks for answer.
Strigi indexing was always enabled.
I don't know why but now it works, maybe a couple reboots did the trick?