Sound stops working occasionally on Latitude E7440

[Diaa Sami]

Sound stops(and starts) working from time to time with no definitive cause, it usually doesn't happen while something is playing so this makes it harder to find the cause.

It happened once after resume from suspend(STR), restarting fixed it.
Another time it happened after unplugging the AC adapter and turning on the hardware WiFi button, suspending to RAM and resuming fixed it.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.219
ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
Uname: Linux 3.13.0-19-generic x86_64
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: KDE
Date: Tue Mar 25 19:23:29 2014
InstallationDate: Installed on 2014-03-18 (6 days ago)
InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140227)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: No upgrade log present (probably fresh install)

[Raymond (superquad-vortex2)]

[ 5322.799894] WARNING: CPU: 1 PID: 7280 at /build/buildd/linux-3.13.0/kernel/irq/manage.c:1256 __free_irq+0xa3/0x1e0()
[ 5322.799895] Trying to free already-free IRQ 20
[ 5322.799920] Modules linked in: ctr ccm bnep rfcomm bluetooth binfmt_misc pn544_mei mei_phy pn544 hci nfc ppdev dell_wmi sparse_keymap dell_laptop dcdbas intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse uvcvideo serio_raw videobuf2_vmalloc joydev videobuf2_memops videobuf2_core videodev snd_hda_codec_realtek arc4 snd_hda_codec_hdmi ath9k snd_hda_intel ath9k_common snd_hda_codec ath9k_hw snd_hwdep ath mac80211 snd_seq_midi snd_pcm snd_seq_midi_event cfg80211 snd_page_alloc lpc_ich snd_rawmidi mei_me mei snd_seq snd_seq_device snd_timer snd parport_pc soundcore mac_hid lp parport hid_generic usbhid hid ahci libahci sdhci_pci sdhci e1000e i915 ptp pps_core wmi i2c_algo_bit drm_kms_helper video drm
[ 5322.799923] CPU: 1 PID: 7280 Comm: kworker/u8:15 Not tainted 3.13.0-19-generic #40-Ubuntu
[ 5322.799924] Hardware name: Dell Inc. Latitude E7440/ , BIOS A07 01/02/2014
[ 5322.799927] Workqueue: events_unbound async_run_entry_fn
[ 5322.799929] 0000000000000009 ffff880117597ba8 ffffffff81711075 ffff880117597bf0
[ 5322.799930] ffff880117597be0 ffffffff810662cd ffff88003633e800 ffff880035510000
[ 5322.799931] 0000000000000014 ffff88003633e89c ffff88003633e800 ffff880117597c40
[ 5322.799932] Call Trace:
[ 5322.799935] [<ffffffff81711075>] dump_stack+0x45/0x56
[ 5322.799937] [<ffffffff810662cd>] warn_slowpath_common+0x7d/0xa0
[ 5322.799938] [<ffffffff8106633c>] warn_slowpath_fmt+0x4c/0x50
[ 5322.799939] [<ffffffff810be813>] __free_irq+0xa3/0x1e0
[ 5322.799940] [<ffffffff810be9e9>] free_irq+0x49/0xb0
[ 5322.799947] [<ffffffffa01856ad>] e1000_free_irq+0x6d/0x80 [e1000e]
[ 5322.799952] [<ffffffffa0190987>] __e1000_shutdown+0x97/0x8a0 [e1000e]
[ 5322.799956] [<ffffffffa01911e7>] e1000_suspend+0x17/0x20 [e1000e]
[ 5322.799959] [<ffffffff8139ee9c>] pci_pm_suspend+0x6c/0x150
[ 5322.799960] [<ffffffff8139ee30>] ? pci_pm_freeze+0xe0/0xe0
[ 5322.799963] [<ffffffff814929b9>] dpm_run_callback+0x49/0xa0
[ 5322.799964] [<ffffffff81492dbb>] __device_suspend+0xdb/0x280
[ 5322.799966] [<ffffffff8109922a>] ? try_to_wake_up+0x1fa/0x2c0
[ 5322.799967] [<ffffffff81492f7f>] async_suspend+0x1f/0xa0
[ 5322.799969] [<ffffffff810900d7>] async_run_entry_fn+0x37/0x130
[ 5322.799971] [<ffffffff810824a2>] process_one_work+0x182/0x450
[ 5322.799972] [<ffffffff81083241>] worker_thread+0x121/0x410
[ 5322.799974] [<ffffffff81083120>] ? rescuer_thread+0x3e0/0x3e0
[ 5322.799975] [<ffffffff81089ed2>] kthread+0xd2/0xf0
[ 5322.799976] [<ffffffff81089e00>] ? kthread_create_on_node+0x190/0x190
[ 5322.799978] [<ffffffff817219bc>] ret_from_fork+0x7c/0xb0
[ 5322.799979] [<ffffffff81089e00>] ? kthread_create_on_node+0x190/0x190

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Allan Crooks (amcone)]

I've been suffering with this problem too, though I've also been suffering with it in 13.10.

[Diaa Sami (diaa.sami)]

It seems that suspending (to ram) fixes the problem most of the time.