Description of problem: when my os kernel upgrade to 2.6.40.4, my pc no sound my os detail: ---------------- # lspci 00:00.0 Host bridge: Intel Corporation 4 Series Chipset DRAM Controller (rev 03) 00:01.0 PCI bridge: Intel Corporation 4 Series Chipset PCI Express Root Port (rev 03) 00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio 01:00.0 VGA compatible controller: nVidia Corporation GT218 [GeForce 310] (rev a2) 01:00.1 Audio device: nVidia Corporation High Definition Audio Controller (rev a1) ------------------- #lsmod Module Size Used by fuse 62381 3 vboxpci 13583 0 vboxnetadp 5674 0 vboxnetflt 15257 0 vboxdrv 1805247 3 vboxpci,vboxnetadp,vboxnetflt tun 14179 2 bnep 14619 2 bluetooth 191587 7 bnep rfkill 16436 3 bluetooth ip6t_REJECT 3992 2 nf_conntrack_ipv4 8358 1 nf_conntrack_ipv6 7730 1 nf_defrag_ipv4 1513 1 nf_conntrack_ipv4 nf_defrag_ipv6 9083 1 nf_conntrack_ipv6 xt_state 1306 2 nf_conntrack 67613 3 nf_conntrack_ipv4,nf_conntrack_ipv6,xt_state ip6table_filter 1655 1 ip6_tables 16908 1 ip6table_filter snd_hda_codec_hdmi 22499 4 snd_hda_codec_realtek 321997 1 snd_hda_intel 23896 2 snd_hda_codec 82508 3 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel nouveau 545437 3 snd_hwdep 6328 1 snd_hda_codec snd_seq 52322 0 snd_seq_device 5941 1 snd_seq ttm 55273 1 nouveau drm_kms_helper 26474 1 nouveau drm 193661 5 nouveau,ttm,drm_kms_helper iTCO_wdt 13000 0 i2c_i801 9237 0 iTCO_vendor_support 2578 1 iTCO_wdt broadcom 7245 0 snd_pcm 78440 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec i2c_algo_bit 4974 1 nouveau snd_timer 19356 2 snd_seq,snd_pcm snd 63380 13 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_seq,snd_seq_device,snd_pcm,snd_timer soundcore 6267 1 snd snd_page_alloc 7343 2 snd_hda_intel,snd_pcm i2c_core 25712 5 nouveau,drm_kms_helper,drm,i2c_i801,i2c_algo_bit tg3 115617 0 mxm_wmi 1727 1 nouveau wmi 9033 1 mxm_wmi video 12340 1 nouveau microcode 18028 0 dcdbas 7716 0 serio_raw 4414 0 -------------------------------------- next, /var/log/messages detail of about pulseaudio: Aug 9 10:07:35 chopin rtkit-daemon[1345]: Successfully made thread 1344 of process 1344 (/usr/bin/pulseaudio) owned by '42' high priority at nice level -11.Aug 9 10:07:35 chopin rtkit-daemon[1345]: Failed to make thread 1360 RT: Operation not permitted Aug 9 10:07:35 chopin rtkit-daemon[1345]: Failed to make thread 1360 RT: Operation not permitted Aug 9 10:07:35 chopin rtkit-daemon[1345]: Failed to make thread 1361 RT: Operation not permitted Aug 9 10:07:35 chopin rtkit-daemon[1345]: Failed to make thread 1361 RT: Operation not permitted Aug 9 10:07:35 chopin rtkit-daemon[1345]: Failed to make thread 1362 RT: Operation not permitted Aug 9 10:07:35 chopin rtkit-daemon[1345]: Failed to make thread 1362 RT: Operation not permitted