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[Raymond <1263036@xxxxxxxxxxxxxxxxxx>]

[    0.000000] WARNING: CPU: 0 PID: 0 at /build/buildd/linux-3.11.0/drivers/iommu/dmar.c:488 warn_invalid_dmar+0x7e/0x90()
[    0.000000] Your BIOS is broken; DMAR reported at address 0!
[    0.000000] BIOS vendor: LENOVO; Ver: 74CN26WW(V1.07); Product Version: Lenovo IdeaPad Y410P
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.11.0-14-generic #21-Ubuntu
[    0.000000] Hardware name: LENOVO 20216/20216, BIOS 74CN26WW(V1.07) 05/08/2013
[    0.000000]  000000000000000b ffffffff81c01de8 ffffffff816e593a ffffffff81c01e30
[    0.000000]  ffffffff81c01e20 ffffffff81061dbd ffffffff81fd0008 ffffffff81fd0034
[    0.000000]  0000000000000000 ffff88026f5abf00 ffffffff81e72000 ffffffff81c01e80
[    0.000000] Call Trace:
[    0.000000]  [<ffffffff816e593a>] dump_stack+0x45/0x56
[    0.000000]  [<ffffffff81061dbd>] warn_slowpath_common+0x7d/0xa0
[    0.000000]  [<ffffffff81061e74>] warn_slowpath_fmt_taint+0x44/0x50
[    0.000000]  [<ffffffff81d401f3>] ? early_ioremap+0x13/0x15
[    0.000000]  [<ffffffff81d36d4e>] ? __acpi_map_table+0x13/0x18
[    0.000000]  [<ffffffff815c446e>] warn_invalid_dmar+0x7e/0x90
[    0.000000]  [<ffffffff81d7b0d4>] check_zero_address+0x68/0xf4
[    0.000000]  [<ffffffff81d7b175>] detect_intel_iommu+0x15/0xae
[    0.000000]  [<ffffffff81d30e24>] pci_iommu_alloc+0x4a/0x6c
[    0.000000]  [<ffffffff81d3fc2c>] mem_init+0x17/0x9c
[    0.000000]  [<ffffffff81d26ccb>] start_kernel+0x1de/0x416
[    0.000000]  [<ffffffff81d268f6>] ? repair_env_string+0x5c/0x5c
[    0.000000]  [<ffffffff81d26120>] ? early_idt_handlers+0x120/0x120
[    0.000000]  [<ffffffff81d265de>] x86_64_start_reservations+0x2a/0x2c
[    0.000000]  [<ffffffff81d266e8>] x86_64_start_kernel+0x108/0x117

** Package changed: alsa-driver (Ubuntu) => linux (Ubuntu)

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https://bugs.launchpad.net/bugs/1263036

Title:
  [20216, Realtek ALC282, Speaker, Internal] Power-Save buzzing, and
  suspend/shutdown popping

Status in “linux” package in Ubuntu:
  New

Bug description:
  Hello,

  I'm having a couple issues regarding the audio on my Ideapad Y410P
  laptop. The first issue is that when external audio devices are
  plugged into the headphone jack on the laptop, the internal speakers
  begin making a high-pitch buzzing noise until the device is unplugged.
  I have discovered that I can remedy this issue by disabling "Auto-
  Mute" in alsamixer.

  Another issue I have been having is a faint buzzing sound followed by
  a loud pop that emits from my laptop's speakers upon suspending or
  shutting it down. The volume at the time of shutdown does not have any
  effect on this.

  Finally, when my laptop is running off battery, my internal speakers
  emit a high pitched buzzing sound when the audio is idle. However,
  disabling the audio device power-save feature remedies this problem
  entirely.

  Thank you for your help, and if there is anything I can do to help
  with the process, I would be more than happy to participate.

  -Nicholas Anderson

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
  Uname: Linux 3.11.0-14-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  nanderson   2076 F.... pulseaudio
   /dev/snd/controlC0:  nanderson   2076 F.... pulseaudio
  Date: Fri Dec 20 03:41:18 2013
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-12-15 (4 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MarkForUpload: True
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_Jack: Speaker, Internal
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_Type: Underruns, dropouts, or "crackling" sound
  Title: [20216, Realtek ALC282, Speaker, Internal] Underruns, dropouts or crackling sound
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/08/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 74CN26WW(V1.07)
  dmi.board.asset.tag: YB00581619
  dmi.board.name: 20216
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900003WIN8 STD MLT
  dmi.chassis.asset.tag: YB00581619
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo IdeaPad Y410P
  dmi.modalias: dmi:bvnLENOVO:bvr74CN26WW(V1.07):bd05/08/2013:svnLENOVO:pn20216:pvrLenovoIdeaPadY410P:rvnLENOVO:rn20216:rvr31900003WIN8STDMLT:cvnLENOVO:ct10:cvrLenovoIdeaPadY410P:
  dmi.product.name: 20216
  dmi.product.version: Lenovo IdeaPad Y410P
  dmi.sys.vendor: LENOVO

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