did your graphic driver or HDMI monitor also went into s3 or s4 when your computer suspend an resume ?
[ 8603.304717] WARNING: CPU: 0 PID: 1174 at /build/buildd/linux-3.13.0/fs/sysfs/group.c:214 sysfs_remove_group+0xc6/0xd0() [ 8603.304720] sysfs group ffffffff81cab340 not found for kobject 'hidraw0' [ 8603.304721] Modules linked in: nfsv3 rpcsec_gss_krb5 nfsv4 nfsd auth_rpcgss nfs_acl nfs lockd sunrpc fscache nls_iso8859_1 snd_hda_codec_hdmi bnep rfcomm bluetooth nvidia(POF) joydev eeepc_wmi asus_wmi sparse_keymap wmi intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec_realtek kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 snd_hda_intel lrw gf128mul snd_hda_codec glue_helper ablk_helper cryptd snd_hwdep snd_pcm snd_page_alloc snd_seq_midi snd_seq_midi_event psmouse snd_rawmidi serio_raw snd_seq lpc_ich snd_seq_device snd_timer snd mei_me mei soundcore mac_hid lp parport hid_logitech_dj usbhid hid r8169 usb_storage mii video [ 8603.304777] CPU: 0 PID: 1174 Comm: upowerd Tainted: PF O 3.13.0-19-generic #40-Ubuntu [ 8603.304779] Hardware name: System manufacturer System Product Name/P8H77-M LE, BIOS 1302 06/04/2013 [ 8603.304781] 0000000000000009 ffff8800d1e27d28 ffffffff81711075 ffff8800d1e27d70 [ 8603.304786] ffff8800d1e27d60 ffffffff810662cd 0000000000000000 ffffffff81cab340 [ 8603.304789] ffff88020e342010 ffff88020e10b8e8 ffff88020e3da2a0 ffff8800d1e27dc0 [ 8603.304793] Call Trace: [ 8603.304800] [<ffffffff81711075>] dump_stack+0x45/0x56 [ 8603.304805] [<ffffffff810662cd>] warn_slowpath_common+0x7d/0xa0 [ 8603.304808] [<ffffffff8106633c>] warn_slowpath_fmt+0x4c/0x50 [ 8603.304814] [<ffffffff8122ff0e>] ? sysfs_get_dirent_ns+0x4e/0x70 [ 8603.304817] [<ffffffff812311f6>] sysfs_remove_group+0xc6/0xd0 [ 8603.304822] [<ffffffff81490b03>] dpm_sysfs_remove+0x43/0x50 [ 8603.304827] [<ffffffff81486535>] device_del+0x45/0x1c0 [ 8603.304830] [<ffffffff814866ce>] device_unregister+0x1e/0x60 [ 8603.304834] [<ffffffff8148678c>] device_destroy+0x3c/0x50 [ 8603.304843] [<ffffffffa00698e7>] drop_ref.part.2+0x57/0x70 [hid] [ 8603.304851] [<ffffffffa006a231>] hidraw_release+0xa1/0xc0 [hid] [ 8603.304855] [<ffffffff811ba434>] __fput+0xe4/0x260 [ 8603.304859] [<ffffffff811ba5fe>] ____fput+0xe/0x10 [ 8603.304865] [<ffffffff81086c97>] task_work_run+0xa7/0xe0 [ 8603.304871] [<ffffffff81013df7>] do_notify_resume+0x97/0xb0 [ 8603.304875] [<ffffffff81721d2a>] int_signal+0x12/0x17 ** Changed in: pulseaudio (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1299786 Title: Sometimes no audio, output changed to S/PDIF To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1299786/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs