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[Bug 1539967] Re: Audio skips (buffer underruns) intermittently but particularly when screen blanks


59001.166788] pavucontrol[3288]: segfault at 0 ip 00007f1b8bfd5084 sp 00007ffc7559e310 error 4 in libpixman-1.so.0.32.6[7f1b8bf87000+a5000]
 [75134.180956] traps: Compositor[24362] general protection ip:561f8a9cba52 sp:7f57917511a0 error:0 in chrome[561f8980b000+5a2d000] 
[283749.002864] CE: hpet increased min_delta_ns to 30172 nsec 
[413910.079197] CE: hpet increased min_delta_ns to 45258 nsec 
[415104.464631] chrome: page allocation failure: order:4, mode:0x40d0 
[415104.464638] CPU: 1 PID: 3181 Comm: chrome Tainted: P OE 4.2.0-25-generic #30-Ubuntu [415104.464640] Hardware name: Gigabyte Technology Co., Ltd. GA-MA790GP-DS4H/GA-MA790GP-DS4H, BIOS F6 09/16/2009
 [415104.464643] 0000000000000000 0000000036cc3fa3 ffff88038b573438 ffffffff817e94c9 [415104.464645] 0000000000000000 00000000000040d0 ffff88038b5734c8 ffffffff81187be2
 [415104.464648] 0000000000000000 0000000000000004 0000000000000040 ffff8800c98d4b00
 [415104.464650] Call Trace: [415104.464657] [<ffffffff817e94c9>] dump_stack+0x45/0x57 [415104.464660] [<ffffffff81187be2>] warn_alloc_failed+0xf2/0x140 [415104.464663] [<ffffffff8118b4de>] ? __alloc_pages_direct_compact+0xee/0xf0 [415104.464665] [<ffffffff8118b7c4>] __alloc_pages_nodemask+0x2e4/0xa10 [415104.464668] [<ffffffff811d31a1>] alloc_pages_current+0x91/0x100 [415104.464670] [<ffffffff81187dab>] alloc_kmem_pages+0x3b/0xe0 [415104.464673] [<ffffffff811a727e>] kmalloc_order_trace+0x2e/0xc0 [415104.464676] [<ffffffff811decdd>] __kmalloc+0x21d/0x250 [415104.464765] [<ffffffffc019d193>] ? KCL_MEM_SmallBufferAlloc+0x13/0x20 [fglrx] [415104.464804] [<ffffffffc019d193>] KCL_MEM_SmallBufferAlloc+0x13/0x20 [fglrx] [415104.464844] [<ffffffffc01a4493>] drm_alloc+0xc3/0x1a0 [fglrx] [415104.464888] [<ffffffffc01c4355>] ? __alloc_memory_uswc+0x65/0x260 [fglrx] [415104.464931] [<ffffffffc01c243e>] ? gal_alloc_gart_memory+0x3e/0xa0 [fglrx] [415104.464974] [<ffffffffc01cca91>] ? __mc_heap_alloc_memory+0xf1/0x1f0 [fglrx] [415104.465017] [<ffffffffc01c7ba4>] ? mc_heap_allocate_memory+0x74/0x130 [fglrx] [415104.465060] [<ffffffffc01badd4>] ? MCIL_AllocateMemoryInDescriptor+0x74/0xe0 [fglrx] [415104.465125] [<ffffffffc026e38f>] ? _ZN2OS10gart_AllocEP7CMMPoolmmRm9_CMM_HEAP+0xef/0x1f0 [fglrx] 
[415104.465183] [<ffffffffc02488a6>] ? _ZN12CMMHeap_GART10expandHeapEmRmPv+0x76/0x100 [fglrx] [415104.465239] [<ff

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  Audio skips (buffer underruns) intermittently but particularly when
  screen blanks

Status in alsa-driver package in Ubuntu:

Bug description:
  Audio playback via ALSA (snd_intel_hda) & pulseaudio inevitably
  'skips' (repeats buffer content) intermittently a few times each hour,
  and severely whenever the screen is blanked for inactivity.

  CPU load is low (mostly idle).

  I didn't have this problem with my previous fresh installation of
  Ubuntu (14.04.3 LTS) on this hardware.

  From dmesg, kernel appears to be using the TSC clocksource:
  [ 3.180127] clocksource: Switched to clocksource tsc

  Upon startup, Pulseaudio sees high resolution timers:
  I: [pulseaudio] main.c: Fresh high-resolution timers available! Bon appetit!

  When audio skips, alsa-sink.c logs a massive scheduling delay (e.g.
  1070.00 ms > 15.99 ms) and also that "snd_pcm_avail() returned a value
  that is exceptionally large: 623124 bytes (1177 ms)"

  Currently running Ubuntu 15.10 Wily (fresh install).
    Installed: 1.0.25+dfsg-0ubuntu5
  Installed: 1:6.0-0ubuntu13

  Audio output used is Built-in Audio Analogue Surround 5.1 (motherboard
  audio, Realtek ALC889A)

  Attaching log from pulseaudio -vvvv

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 4.2.0-25.30-generic 4.2.6
  Uname: Linux 4.2.0-25-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl fglrx
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
   /dev/snd/pcmC0D0p:   chinf      7928 F...m pulseaudio
   /dev/snd/controlC0:  chinf      7928 F.... pulseaudio
   /dev/snd/controlC1:  chinf      7928 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat Jan 30 18:17:01 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-12-11 (50 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_Card: Built-in Audio - HDA ATI SB
  Symptom_Jack: Green Line Out, Rear
  Symptom_Type: Sound works for a while, then breaks
  Title: [GA-MA790GP-DS4H, Realtek ALC889A, Green Line Out, Rear] fails after a while
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/16/2009
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F6
  dmi.board.name: GA-MA790GP-DS4H
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF6:bd09/16/2009:svnGigabyteTechnologyCo.,Ltd.:pnGA-MA790GP-DS4H:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-MA790GP-DS4H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: GA-MA790GP-DS4H
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.
  mtime.conffile..etc.modprobe.d.alsa.base.conf: 2016-01-12T14:13:00.166647

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