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[Launchpad Bug Tracker <1758800@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.13.0-39.44

---------------
linux (4.13.0-39.44) artful; urgency=medium

  * linux: 4.13.0-39.44 -proposed tracker (LP: #1761456)

  * intel-microcode 3.20180312.0 causes lockup at login screen(w/ linux-
    image-4.13.0-37-generic) (LP: #1759920) // CVE-2017-5715 (Spectre v2
    Intel) // CVE-2017-5754
    - x86/mm: Reinitialize TLB state on hotplug and resume

  * intel-microcode 3.20180312.0 causes lockup at login screen(w/ linux-
    image-4.13.0-37-generic) (LP: #1759920) // CVE-2017-5715 (Spectre v2 Intel)
    - Revert "x86/mm: Only set IBPB when the new thread cannot ptrace current
      thread"
    - x86/speculation: Use Indirect Branch Prediction Barrier in context switch

  * DKMS driver builds fail with: Cannot use CONFIG_STACK_VALIDATION=y, please
    install libelf-dev, libelf-devel or elfutils-libelf-devel (LP: #1760876)
    - [Packaging] include the retpoline extractor in the headers

  * retpoline hints: primary infrastructure and initial hints (LP: #1758856)
    - [Packaging] retpoline-extract: flag *0xNNN(%reg) branches
    - x86/speculation, objtool: Annotate indirect calls/jumps for objtool
    - x86/speculation, objtool: Annotate indirect calls/jumps for objtool on 32bit
    - x86/paravirt, objtool: Annotate indirect calls
    - [Packaging] retpoline -- add safe usage hint support
    - [Packaging] retpoline-check -- only report additions
    - [Packaging] retpoline -- widen indirect call/jmp detection
    - [Packaging] retpoline -- elide %rip relative indirections
    - [Packaging] retpoline -- clear hint information from packages
    - KVM: x86: Make indirect calls in emulator speculation safe
    - KVM: VMX: Make indirect call speculation safe
    - x86/boot, objtool: Annotate indirect jump in secondary_startup_64()
    - SAUCE: early/late -- annotate indirect calls in early/late initialisation
      code
    - SAUCE: vga_set_mode -- avoid jump tables
    - [Config] retpoline -- switch to new format
    - [Packaging] retpoline hints -- handle missing files when RETPOLINE not
      enabled
    - [Packaging] final-checks -- remove check for empty retpoline files

  * retpoline: ignore %cs:0xNNN constant indirections (LP: #1752655)
    - [Packaging] retpoline -- elide %cs:0xNNNN constants on i386

  * zfs system process hung on container stop/delete (LP: #1754584)
    - SAUCE: Fix non-prefaulted page deadlock (LP: #1754584)

  * zfs-linux 0.6.5.11-1ubuntu5 ADT test failure with linux 4.15.0-1.2
    (LP: #1737761)
    - SAUCE: (noup) Update zfs to 0.6.5.11-1ubuntu3.2

  * AT_BASE_PLATFORM in AUXV is absent on kernels available on Ubuntu 17.10
    (LP: #1759312)
    - powerpc/64s: Fix NULL AT_BASE_PLATFORM when using DT CPU features

  * btrfs and tar sparse truncate archives (LP: #1757565)
    - Btrfs: move definition of the function btrfs_find_new_delalloc_bytes
    - Btrfs: fix reported number of inode blocks after buffered append writes

  * efifb broken on ThunderX-based Gigabyte nodes (LP: #1758375)
    - drivers/fbdev/efifb: Allow BAR to be moved instead of claiming it

  * Intel i40e PF reset due to incorrect MDD detection (continues...)
    (LP: #1723127)
    - i40e/i40evf: Account for frags split over multiple descriptors in check
      linearize

  * Fix an issue that when system in S3, USB keyboard can't wake up the system.
    (LP: #1759511)
    - ACPI / PM: Allow deeper wakeup power states with no _SxD nor _SxW

  * [8086:3e92] display becomes blank after S3 (LP: #1759188)
    - drm/i915: Apply Display WA #1183 on skl, kbl, and cfl

  * add audio kernel patches for Raven (LP: #1758364)
    - ALSA: hda: Add Raven PCI ID
    - ALSA: hda/realtek - Fix ALC700 family no sound issue

  * Cpu utilization showing system time for kvm guests (performance) (sysstat)
    (LP: #1755979)
    - KVM: PPC: Book3S HV: Fix guest time accounting with VIRT_CPU_ACCOUNTING_GEN

  * Kernel panic on a nfsroot system (LP: #1734327)
    - Revert "UBUNTU: SAUCE: LSM stacking: add stacking support to apparmor
      network hooks"
    - Revert "UBUNTU: SAUCE: LSM stacking: LSM: Infrastructure management of the
      remaining blobs"

  * can't record sound via front headset port on the Dell Precision 3630
    (LP: #1759088)
    - ALSA: hda/realtek - Fix Dell headset Mic can't record

  * speaker can't output sound anymore after system resumes from S3 on a lenovo
    machine with alc257 (LP: #1758829)
    - ALSA: hda/realtek - Fix speaker no sound after system resume

  * hda driver initialization takes too much time on the machine with coffeelake
    audio controller [8086:a348] (LP: #1758800)
    - ALSA: hda - Force polling mode on CFL for fixing codec communication

  * Let headset-mode initialization be called on Dell Precision 3930
    (LP: #1757584)
    - ALSA: hda/realtek - Add headset mode support for Dell laptop

  * ubuntu_zram_smoke test will cause soft lockup on Artful ThunderX ARM64
    (LP: #1755073)
    - SAUCE: crypto: thunderx_zip: Fix fallout from CONFIG_VMAP_STACK

  * [Hyper-V] include kvp fix for Avoid reading past allocated blocks from KVP
    file (LP: #1750349)
    - hv: kvp: Avoid reading past allocated blocks from KVP file

  * IMA policy parsing is broken in 4.13 (LP: #1755804)
    - ima/policy: fix parsing of fsuuid

  * external mic not work on Dell OptiPlex 7460 AIO (LP: #1755954)
    - ALSA: hda/realtek - Add headset mode support for Dell laptop

  * sbsa watchdog crashes thunderx2 system (LP: #1755595)
    - watchdog: sbsa: use 32-bit read for WCV

  * CVE-2018-8043
    - net: phy: mdio-bcm-unimac: fix potential NULL dereference in
      unimac_mdio_probe()

 -- Stefan Bader <stefan.bader@xxxxxxxxxxxxx>  Thu, 05 Apr 2018 14:47:00
+0200

** Changed in: linux (Ubuntu Artful)
       Status: Fix Committed => Fix Released

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-5715

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-5754

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-8043

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https://bugs.launchpad.net/bugs/1758800

Title:
  hda driver initialization takes too much time on the machine with
  coffeelake audio controller [8086:a348]

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Confirmed
Status in linux-oem package in Ubuntu:
  New
Status in linux source package in Xenial:
  Invalid
Status in linux-oem source package in Xenial:
  Fix Committed
Status in linux source package in Artful:
  Fix Released
Status in linux-oem source package in Artful:
  Invalid

Bug description:
  [Impact]

  We have a couple of laptop and desktop computers, all of them are cfl platforms
  and all of them have cfl audio controller [8086:a348], and these computers have
  different realtek codecs on them (alc256, alc255, alc289 and ...). The hda
  driver takes too much time (3 secs - 8 secs) to initialize on these machines.
  This problem never happened on kbl, skl, bdw, ... before.

  Sometimes this can make pulseaudio can't work well.

  pulseaudio starts, but the driver (as kernel modules) initialization has not
  finished, then there is no valid sink in the pulseaudio. At this moment, some UI
  Apps already start using pulseaudio to play sound, but users can't hear the sound
  as expected. This problem never happened before, it is exposed on cfl platforms,
  and all cfl platforms (with audio controller 8086:a348) have this problem.

  [Fix]
  Set the polling mode can fix this problem, and this workaround is in the
  mainline kernel.

  [Test Case]
  Boot the machine and check the dmesg, from the hda log, we can see the driver
  initialization is finished within 0.1s and pulseaudio works well.

  [Regression Potential]
  No regression, this fix is only for CFL audio controller (8086:a348), and
  in theory, polling mode is safe for all audio controllers, using interrupt
  mode rather than polling mode on other platforms just wants to save polling
  overhead for CPUs, since interrupt mode can't work well on CFL platform, we
  have to use polling mode.

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