Hi List, been chasing my tail for the last two hours and getting nowhere on my wifes laptop. I only do updates monthly on her machine, as it is safely behind firewalls and only does email and browser stuff. I have never had audio problems on this laptop, Centos just worked from day one - even the wireless. It appears that the 5.5 kernels and related audio driver snd-hda-intel do not function. If I reboot into 2.6.18-164.15.1.el5.centos.plus all is well. $ cat /proc/asound/cards 0 [Intel ]: HDA-Intel - HDA Intel HDA Intel at 0x80000000 irq 169 1 [U0x46d0x804 ]: USB-Audio - USB Device 0x46d:0x804 USB Device 0x46d:0x804 at usb-0000:00:1d.7-3, high speed Neither 2.6.18-194.3.1.el5.centos.plus or 2.6.18-194.8.1.el5.centos.plus have functioning sound. on these kernels I get $ cat /proc/asound/cards 0 [U0x46d0x804 ]: USB-Audio - USB Device 0x46d:0x804 USB Device 0x46d:0x804 at usb-0000:00:1d.7-3, high speed yet lsmod shows <snip> snd_hda_intel 472337 0 snd_seq_dummy 7877 0 snd_seq_oss 32577 0 snd_seq_midi_event 11073 1 snd_seq_oss snd_seq 49585 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event snd_pcm_oss 42817 0 snd_usb_audio 77761 2 snd_mixer_oss 19009 1 snd_pcm_oss snd_pcm 72133 3 snd_hda_intel,snd_pcm_oss,snd_usb_audio snd_usb_lib 19137 1 snd_usb_audio snd_rawmidi 26561 1 snd_usb_lib snd_timer 24517 2 snd_seq,snd_pcm snd_page_alloc 14281 2 snd_hda_intel,snd_pcm snd_seq_device 11725 4 snd_seq_dummy,snd_seq_oss,snd_seq,snd_rawmidi snd_hwdep 12869 2 snd_hda_intel,snd_usb_audio snd 55749 15 snd_hda_intel,snd_seq_oss,snd_seq,snd_pcm_oss,snd_usb_audio,snd_mixer_oss,snd_pcm,snd_rawmidi,snd_timer,snd_seq_device,snd_hwdep soundcore 11553 1 snd So I remembered the bug rh introduced with the 194 kernels and nvidia chipsets (not my case but I'm desperate) and added the enable_msi=0 so that my modprobe.conf is now <snip> options snd cards_limit=8 alias snd-card-0 snd-hda-intel options snd-hda-intel index=0 enable_msi=0 but it still will not work. <rant> I am getting frustrated at the retrograde steps that seem to be hitting kernel and 5.x upgrades lately. yum update used to just work, get me the latest patches and all was well - after all that is why I use Centos. </rant> I have tried modprobe -r to remove and reload module but to no avail. Anyone have any ideas as to what I try next? Google has not given me any ideas yet. TIA -------------- next part -------------- A non-text attachment was scrubbed... Name: rkampen.vcf Type: text/x-vcard Size: 123 bytes Desc: not available URL: <http://lists.centos.org/pipermail/centos/attachments/20100717/174a5d0a/attachment-0004.vcf>