[LAU] eeepc 4G and ALSA underrun

hello, i own an eeepc 4G (701) but ALSA makes a lot for underrun withe de Intel soundcard (snd_hda_intel). Surprisingly, using the OSS emulation works better. I don't think it is a question of CPU load (900Mhz) but rather a problem of IRQ of the sound chip. Is it possible to tell to snd_hda_intel to force the useof the soundecard in a better IRQ ? Here is my /proc/interrputs for intel by defa 16: 56715 IO-APIC-fasteoi uhci_hcd:usb4, HDA Intel, i915@pci:0000:00:02.0 my kernel is : 2.6.28-12-netbook-eeepc #43 SMP Mon Apr 27 16:06:05 MDT 2009 i686 thanks if you have any advice on putting something in modprobe.conf to get more priority to sound. - ben