There is noise for headphone playback after resume back from S3 for Dell XPS 13

commit 8c69729b4439bbda88c3073df7243f755cc418ed
Author: Hui Wang <email address hidden>
Date: Tue Nov 24 11:08:18 2015 +0800

    ALSA: hda - Fix headphone noise after Dell XPS 13 resume back from S3

    We have a machine Dell XPS 13 with the codec alc256, after resume back
    from S3, the headphone has noise when play sound.

    Through comparing with the coeff vaule before and after S3, we found
    restoring a coeff register will help remove noise.

    BugLink: https://bugs.launchpad.net/bugs/1519168
    Cc: Kailang Yang <email address hidden>
    Cc: <email address hidden>
    Signed-off-by: Hui Wang <email address hidden>
    Signed-off-by: Takashi Iwai <email address hidden>

This patch in in through upstream stable updates, thus I am tagging it as verified for trusty.

This fix came into vivid in an upstream stable update, thus I am tagging it as verified.

Fix released in 3.19.0-47.53

Fix released in 3.13.0-77.121

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-wily' to 'verification-done-wily'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

This bug was fixed in the package linux - 4.2.0-30.35

---------------
linux (4.2.0-30.35) wily; urgency=low

  [ Seth Forshee ]

  * SAUCE: cred: Add clone_cred() interface
    - LP: #1531747, #1534961, #1535150
    - CVE-2016-1575 CVE-2016-1576
  * SAUCE: overlayfs: Use mounter's credentials instead of selectively
    raising caps
    - LP: #1531747, #1534961, #1535150
    - CVE-2016-1575 CVE-2016-1576
  * SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.*
    xattrs
    - LP: #1531747, #1534961, #1535150
    - CVE-2016-1575 CVE-2016-1576
  * SAUCE: overlayfs: Be more careful about copying up sxid files
    - LP: #1534961, #1535150
    - CVE-2016-1575 CVE-2016-1576
  * SAUCE: overlayfs: Propogate nosuid from lower and upper mounts
    - LP: #1534961, #1535150
    - CVE-2016-1575 CVE-2016-1576

linux (4.2.0-29.34) wily; urgency=low

  [ Luis Henriques ]

  * Release Tracking Bug
    - LP: #1543167

  [ Brad Figg ]

  * Revert "SAUCE: apparmor: fix sleep from invalid context"
    - LP: #1542049

  [ Upstream Kernel Changes ]

  * Revert "af_unix: Revert 'lock_interruptible' in stream receive code"
    - LP: #1540731

linux (4.2.0-28.33) wily; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1540634

  [ Brad Figg ]

  * CONFIG: CONFIG_DEBUG_UART_BCM63XX is not set

  [ J. R. Okajima ]

  * SAUCE: ubuntu: aufs: tiny, extract a new func xino_fwrite_wkq()
    - LP: #1533043
  * SAUCE: ubuntu: aufs: for 4.3, XINO handles EINTR from the dying process
    - LP: #1533043

  [ John Johansen ]

  * SAUCE: (no-up): apparmor: fix for failed mediation of socket that is
    being shutdown
    - LP: #1446906
  * SAUCE: apparmor: fix sleep from invalid context
    - LP: #1539349

  [ Tim Gardner ]

  * [Config] Add pvpanic to virtual flavour
    - LP: #1537923

  [ Upstream Kernel Changes ]

  * Revert "ACPI / LPSS: allow to use specific PM domain during ->probe()"
    - LP: #1540532
  * tools: Add a "make all" rule
    - LP: #1536370
  * vf610_adc: Fix internal temperature calculation
    - LP: #1536370
  * iio: lpc32xx_adc: fix warnings caused by enabling unprepared clock
    - LP: #1536370
  * iio:ad5064: Make sure ad5064_i2c_write() returns 0 on success
    - LP: #1536370
  * iio: ad5064: Fix ad5629/ad5669 shift
    - LP: #1536370
  * iio:ad7793: Fix ad7785 product ID
    - LP: #1536370
  * iio: adc: vf610_adc: Fix division by zero error
    - LP: #1536370
  * mmc: mmc: Improve reliability of mmc_select_hs200()
    - LP: #1536370
  * mmc: mmc: Fix HS setting in mmc_select_hs400()
    - LP: #1536370
  * mmc: mmc: Move mmc_switch_status()
    - LP: #1536370
  * mmc: mmc: Improve reliability of mmc_select_hs400()
    - LP: #1536370
  * crypto: qat - don't use userspace pointer
    - LP: #1536370
  * iio: si7020: Swap data byte order
    - LP: #1536370
  * iio: adc: xilinx: Fix VREFN scale
    - LP: #1536370
  * ipmi: Start the timer and thread on internal msgs
    - LP: #1536370
  * drm/i915: quirk backlight present on Macbook 4, 1
    - LP: #1536370
  * drm/i915: get runtime PM reference around GEM set_caching IOCTL
    - LP: #1536370
  * drm/radeon: Disable uncacheable CPU mappings of GTT with RV6xx
    - LP: #1536370
  *...