Precision Rack failed to resume from S4

[Kai-Heng Feng]

On a Precision Rack with two CPUs, it failed to resume from S4 at ~70% rate.

These two commits can fix the issue:

commit 406f992e4a372dafbe3c2cff7efbb2002a5c8ebd
Author: Rafael J. Wysocki <email address hidden>
Date: Thu Jul 14 03:55:23 2016 +0200

    x86 / hibernate: Use hlt_play_dead() when resuming from hibernation

commit e4630fdd47637168927905983205d7b7c5c08c09
Author: Rafael J. Wysocki <email address hidden>
Date: Mon Aug 8 15:31:31 2016 +0200

    x86/power/64: Always create temporary identity mapping correctly

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1686061

[Thadeu Lima de Souza Cascardo (cascardo)]

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-xenial' to 'verification-done-xenial'. If the problem still exists, change the tag 'verification-needed-xenial' to 'verification-failed-xenial'.

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!

[Cyrus Lien (cyruslien)]

Test case:
fwts --s4-device-check --s4-device-check-delay=45 --s4-sleep-delay=120 --s4-multiple=30

Result:
Pass S4 hibernate/resume test 30 cycles.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.4.0-79.100

---------------
linux (4.4.0-79.100) xenial; urgency=low

  * linux: 4.4.0-79.100 -proposed tracker (LP: #1691180)

  * linux-aws/linux-gke incorrectly producing and using linux-*-tools-
    common/linux-*-cloud-tools-common (LP: #1688579)
    - [Config] make linux-tools-common and linux-cloud-tools-common provide linux-
      gke versions
    - [Config] make linux-tools-common and linux-cloud-tools-common provide linux-
      aws versions
    - [Packaging] prevent linux-*-tools-common from being produced from non linux
      packages

  * CVE-2017-0605
    - tracing: Use strlcpy() instead of strcpy() in __trace_find_cmdline()

  * i915-bpo crashes on external hdmi input (LP: #1580272)
    - SAUCE: i915_bpo: Silence the warning about watermark entries not changing

  * Kernel panics on Xenial when using cgroups and strict CFS limits
    (LP: #1687512)
    - sched/fair: Initialize throttle_count for new task-groups lazily
    - sched/fair: Do not announce throttled next buddy in dequeue_task_fair()

  * bonding - mlx5 - speed changed to 0 after changing ring size (LP: #1687877)
    - bonding: allow notifications for bond_set_slave_link_state

  * Xenial update to 4.4.67 stable release (LP: #1689296)
    - timerfd: Protect the might cancel mechanism proper
    - Handle mismatched open calls
    - ASoC: intel: Fix PM and non-atomic crash in bytcr drivers
    - ALSA: ppc/awacs: shut up maybe-uninitialized warning
    - drbd: avoid redefinition of BITS_PER_PAGE
    - mtd: avoid stack overflow in MTD CFI code
    - net: tg3: avoid uninitialized variable warning
    - netlink: Allow direct reclaim for fallback allocation
    - IB/qib: rename BITS_PER_PAGE to RVT_BITS_PER_PAGE
    - IB/ehca: fix maybe-uninitialized warnings
    - ext4: require encryption feature for EXT4_IOC_SET_ENCRYPTION_POLICY
    - ext4 crypto: revalidate dentry after adding or removing the key
    - ext4 crypto: use dget_parent() in ext4_d_revalidate()
    - ext4/fscrypto: avoid RCU lookup in d_revalidate
    - nfsd4: minor NFSv2/v3 write decoding cleanup
    - nfsd: stricter decoding of write-like NFSv2/v3 ops
    - dm ioctl: prevent stack leak in dm ioctl call
    - Linux 4.4.67

  * Precision Rack failed to resume from S4 (LP: #1686061)
    - x86 / hibernate: Use hlt_play_dead() when resuming from hibernation
    - x86/boot: Split out kernel_ident_mapping_init()
    - x86/power/64: Always create temporary identity mapping correctly

  * Xenial update to 4.4.66 stable release (LP: #1688505)
    - f2fs: do more integrity verification for superblock
    - xc2028: unlock on error in xc2028_set_config()
    - ARM: OMAP2+: timer: add probe for clocksources
    - clk: sunxi: Add apb0 gates for H3
    - crypto: testmgr - fix out of bound read in __test_aead()
    - drm/amdgpu: fix array out of bounds
    - ext4: check if in-inode xattr is corrupted in ext4_expand_extra_isize_ea()
    - md:raid1: fix a dead loop when read from a WriteMostly disk
    - MIPS: Fix crash registers on non-crashing CPUs
    - net: cavium: liquidio: Avoid dma_unmap_single on uninitialized ndata
    - net_sched: close another race condition in tcf_mirre...