Arch Linux

After the last kernel upgrade, i've got a strange cpu usage (never see with 2.6.16).
The first lines of top :

top - 16:37:08 up 3:37, 3 users, load average: 0.00, 0.02, 0.00
Tasks: 84 total, 1 running, 82 sleeping, 1 stopped, 0 zombie
Cpu(s): 0.0%us, 0.0%sy, 0.0%ni, 85.7%id, 0.0%wa, 0.0%hi, 14.3%si, 0.0%st
^
|
why ? ---

output of lsmod :
Module Size Used by
ipv6 203424 10
sd_mod 14848 0
nls_cp437 6272 1
vfat 9856 1
fat 40732 1 vfat
snd_seq_oss 26368 0
snd_seq_midi_event 6400 1 snd_seq_oss
snd_seq 42576 4 snd_seq_oss,snd_seq_midi_event
usb_storage 67776 0
snd_pcm_oss 32160 0
snd_mixer_oss 14208 1 snd_pcm_oss
via_agp 8320 1
agpgart 24012 1 via_agp
uhci_hcd 18440 0
ehci_hcd 25608 0
i2c_viapro 7572 0
joydev 7872 0
evdev 7680 1
snd_via82xx 21528 1
snd_ac97_codec 79520 1 snd_via82xx
snd_ac97_bus 2688 1 snd_ac97_codec
snd_mpu401_uart 6528 1 snd_via82xx
snd_rawmidi 17952 1 snd_mpu401_uart
snd_seq_device 6540 3 snd_seq_oss,snd_seq,snd_rawmidi
i2c_core 15872 1 i2c_viapro
snd_bt87x 11720 1
snd_pcm 64644 4 snd_pcm_oss,snd_via82xx,snd_ac97_codec,snd_bt87x
snd_timer 17412 2 snd_seq,snd_pcm
snd 40292 16 snd_seq_oss,snd_seq,snd_pcm_oss,snd_mixer_oss,snd_via82xx,snd_ac97_codec,snd_mpu401_uart,snd_rawmidi,snd_seq_device,snd_bt87x,snd_pcm,snd_timer
soundcore 7520 1 snd
snd_page_alloc 7688 3 snd_via82xx,snd_bt87x,snd_pcm
ppdev 7300 0
pcspkr 3200 0
lp 9092 0
analog 9376 0
parport_pc 22564 1
parport 28616 3 ppdev,lp,parport_pc
gameport 11016 2 snd_via82xx,analog
ppp_generic 21652 0
slhc 6144 1 ppp_generic
8139too 21248 0
mii 4992 1 8139too
usbcore 97408 4 usb_storage,uhci_hcd,ehci_hcd
ext3 107528 2
jbd 48020 1 ext3
ide_cd 32160 0
cdrom 30368 1 ide_cd
ide_disk 14724 6
generic 4740 0 [permanent]
via82cxxx 8068 0 [permanent]
ide_core 99912 5 usb_storage,ide_cd,ide_disk,generic,via82cxxx