Comment 11 for bug 183461

After a while of using my notebook the ksoftirqd begins to use all my remaining cpu time.
The only way to return to a normal state is by reboot. But also the reboot fails (it hangs somewhere, I cannot see the console. I'm using nvidia's video driver and have black console as soon as X starts - I can eventually set the nv or vesa driver in xorg.conf and then see).
The worst part is it hangs during shutdown before unmounting HDDs. alt+ctrl+del nor sysrq does not work so I need to hard boot (power off). (Therefore I set this bug as critical, otherwise it can be major)

I have no idea what causes it. Maybe network? Time in /var/log/messages shows only dhcpd doing its stuff + knetworkmanager somewhat appears on the top list.
It hangs on both wlan or lan

I searched for a while. Some guy have similar problem with a Clevo notebook with very similar specs.
I had no such problem with previous suse (11.0)

Any ideas?
My ideas for now can be to try these :
- use for a while only the vesa/nv driver
- install vanilla kernel
- download & install
- disable dhcp daemon (easiest I think)

Here is top of the top processes:

top - 22:35:21 up 1 day, 4:05, 7 users, load average: 1.66, 1.76, 1.52
Tasks: 142 total, 3 running, 139 sleeping, 0 stopped, 0 zombie
Cpu0 : 2.0%us, 6.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 92.0%si, 0.0%st
Cpu1 : 4.0%us, 0.0%sy, 0.3%ni, 95.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 4088564k total, 3940616k used, 147948k free, 66132k buffers
Swap: 4409800k total, 28k used, 4409772k free, 3204660k cached

  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
    4 root 15 -5 0 0 0 R 99 0.0 24:24.67 ksoftirqd/0
 3049 root 20 0 360m 69m 9772 S 4 1.7 31:08.22 X
 9720 micho 39 19 128m 47m 14m S 4 1.2 14:14.83 operapluginwrap
 9628 micho 20 0 511m 382m 17m S 2 9.6 12:52.75 opera
10710 micho 20 0 156m 56m 29m S 2 1.4 11:58.14 amarokapp
 3853 micho 20 0 35884 13m 8840 S 1 0.3 2:55.25 knetworkmanager
 8838 root 15 -5 0 0 0 S 1 0.0 0:00.96 events/1
 3984 micho 20 0 37716 16m 10m R 0 0.4 1:51.73 konsole
11588 root 20 0 99112 57m 24m S 0 1.4 0:51.00 y2base
    1 root 20 0 1008 356 308 S 0 0.0 0:01.20 init
    2 root 15 -5 0 0 0 S 0 0.0 0:00.00 kthreadd
    3 root RT -5 0 0 0 S 0 0.0 0:00.14 migration/0
    7 root 15 -5 0 0 0 S 0 0.0 0:05.14 events/0

/var/log/messages around the fatal time (I think it occured somewhere after the "MARK"):
Jan 9 21:46:30 linux-6vsc dhclient: DHCPREQUEST on eth0 to 192.168.1.1 port 67
Jan 9 21:46:31 linux-6vsc dhclient: DHCPACK from 192.168.1.1
Jan 9 21:46:31 linux-6vsc dhclient: bound to 192.168.1.3 -- renewal in 1625 seconds.
Jan 9 22:06:31 linux-6vsc -- MARK --
Jan 9 22:13:36 linux-6vsc dhclient: DHCPREQUEST on eth0 to 192.168.1.1 port 67
Jan 9 22:13:36 linux-6vsc dhclient: DHCPACK from 192.168.1.1
Jan 9 22:13:36 linux-6vsc dhclient: bound to 192.168.1.3 -- renewal in 1726 seconds.

My system:

Linux linux-6vsc 2.6.27.7-9-pae #1 SMP 2008-12-04 18:10:04 +0100 i686 i686 i386 GNU/Linux
I used kde4. Now I have kde3.

sys_vendor = "CLEVO CO."
sys_product = "M570TU"
Intel(R) Core(TM)2 Duo CPU P8600 @ 2.40GHz
4GB ddr3 ram
nvidia 9800gt

Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)
Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)

Hope somebody will help. I have no idea what ksoftirqd if for.

Thanks in advance.