System cannot detect USB device in BAT mode

[Phidias]

[Impact]

On some Skylake-U platforms, if boots with battery only and has no USB device connect, after boot the USB port can't be used, even though the xHCI Host Controller doesn't report any error in dmesg. The USB device looks like doesn't turn on, LED on USB mouse or keyboard doesn't light up.

[Fix]

There's a fix in mainline v4.2-rc3, though it states the fix is for Braswell, but the uuid use in the commit can also be found on Skylake-U platforms.

Commit log is as follows:

commit c3c5819a350952439c3198aa46581f9e4c46557f
Author: Mathias Nyman <email address hidden>
Date: Tue Jul 21 17:20:25 2015 +0300

    xhci: call BIOS workaround to enable runtime suspend on Intel Braswell

    Intel xhci hw that require XHCI_PME_STUCK quirk have as default disabled
    xhci from going to D3 state in runtime suspend. Driver needs to verify
    it can deal with the hw by calling an ACPI _DSM method to get D3 enabled.

    Signed-off-by: Mathias Nyman <email address hidden>
    Signed-off-by: Greg Kroah-Hartman <email address hidden>

[Test]

1. Install the patched kernel
2. Boot with battery
3. Insert a USB device (disk, keyboard, mouse), should work normally

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1489292

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Brad Figg (brad-figg)]

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-vivid' to 'verification-done-vivid'.

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!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 3.19.0-30.33

---------------
linux (3.19.0-30.33) vivid; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1498065
  * Revert "[Config]
    MFD_INTEL_LPSS/MFD_INTEL_LPSS_ACPI/MFD_INTEL_LPSS_PCI=m"
    - LP: #1498137
  * [Config] Disable the MFD_INTEL_LPSS* driver

linux (3.19.0-30.32) vivid; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1498065

  [ Upstream Kernel Changes ]

  * net: Fix skb_set_peeked use-after-free bug
    - LP: #1497184

linux (3.19.0-29.31) vivid; urgency=low

  [ Luis Henriques ]

  * Release Tracking Bug
    - LP: #1493902

  [ Ander Conselvan de Oliveira ]

  * SAUCE: i915_bpo: Set ddi_pll_sel in DP MST path
    - LP: #1483320

  [ Chris J Arges ]

  * [Config] DEFAULT_IOSCHED="deadline" for ppc64el
    - LP: #1469829

  [ Chris Wilson ]

  * SAUCE: i915_bpo: drm/i915: Flag the execlists context object as dirty
    after every use
    - LP: #1489501

  [ Daniel Vetter ]

  * SAUCE: i915_bpo: drm/i915: Only dither on 6bpc panels
    - LP: #1489501

  [ David Henningsson ]

  * SAUCE: drm/i915: Add audio pin sense / ELD callback
    - LP: #1490895
  * SAUCE: drm/i915: Call audio pin/ELD notify function
    - LP: #1490895
  * SAUCE: ubuntu/i915: Call audio pin/ELD notify function
    - LP: #1490895
  * SAUCE: ALSA: hda - Add "hdac_acomp" global variable
    - LP: #1490895
  * SAUCE: ALSA: hda - allow codecs to access the i915 pin/ELD callback
    - LP: #1490895
  * SAUCE: ALSA: hda - Wake the codec up on pin/ELD notify events
    - LP: #1490895

  [ Jani Nikula ]

  * SAUCE: i915_bpo: Revert "drm/i915: Allow parsing of variable size child
    device entries from VBT"
    - LP: #1489501

  [ Maarten Lankhorst ]

  * SAUCE: i915_bpo: drm/i915: calculate primary visibility changes instead
    of calling from set_config
    - LP: #1489501
  * SAUCE: i915_bpo: drm/i915: Commit planes on each crtc separately.
    - LP: #1489501

  [ Thulasimani,Sivakumar ]

  * SAUCE: i915_bpo: Revert "drm/i915: Add eDP intermediate frequencies for
    CHV"
    - LP: #1489501
  * SAUCE: i915_bpo: drm/i915: remove HBR2 from chv supported list
    - LP: #1489501
  * SAUCE: i915_bpo: drm/i915: Avoid TP3 on CHV
    - LP: #1489501

  [ Timo Aaltonen ]

  * Revert "SAUCE: i915_bpo: drm/i915: Allow parsing of variable size child
    device entries from VBT, addendum v2"
    - LP: #1489501
  * SAUCE: Migrate Broadwell to i915_bpo.
    - LP: #1483320

  [ Upstream Kernel Changes ]

  * tcp: fix recv with flags MSG_WAITALL | MSG_PEEK
    - LP: #1486146
  * powerpc/powernv: Fix the overflow of OPAL message notifiers head array
    - LP: #1487085
  * xhci: call BIOS workaround to enable runtime suspend on Intel Braswell
    - LP: #1489292
  * PM / QoS: Make it possible to expose device latency tolerance to
    userspace
    - LP: #1488395
  * ACPI / PM: Attach ACPI power domain only once
    - LP: #1488395
  * Driver core: wakeup the parent device before trying probe
    - LP: #1488395
  * klist: implement klist_prev()
    - LP: #1488395
  * driver core: implement device_for_each_child_reverse()
    - LP: #1488395
  * mfd: make mfd_remove_devices() iterate in reverse order
    ...