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["Yang Kun \(YK\)" <kun.yang@xxxxxxxxxxxxx>]

** Changed in: hwe-next
     Assignee: Gavin Guo (mimi0213kimo) => Adam Lee (adam8157)

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https://bugs.launchpad.net/bugs/1197616

Title:
  Bluetooth sometimes does not work after suspend WARNING: at
  /build/buildd/linux-lts-
  quantal-3.5.0/drivers/base/firmware_class.c:597
  request_firmware+0xb5/0xf0()

Status in HWE Next Project:
  Confirmed
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Summary: Bluetooth sometimes does not work after resuming from suspend

  Steps:
  1. fwts s3 --s3-multiple=30 --s3-max-delay=5 --s3-min-delay=5
  2. hcitool scan

  Expected results: Can scan and connect to BT devices

  Actual results: Can't scan and connect to BT devices

  In kern.log:

  Jul 3 00:33:48 1704 kernel: [ 2365.124561] PM: Finishing wakeup.
  Jul 3 00:33:48 1704 kernel: [ 2365.156748] ------------[ cut here ]------------
  Jul 3 00:33:48 1704 kernel: [ 2365.156764] WARNING: at /build/buildd/linux-lts-quantal-3.5.0/drivers/base/firmware_class.c:597 request_firmware+0xb5/0xf0()
  Jul 3 00:33:48 1704 kernel: [ 2365.156767] Hardware name: Inspiron 3137
  Jul 3 00:33:48 1704 kernel: [ 2365.124564] Restarting tasks ...
  Jul 3 00:33:48 1704 kernel: [ 2365.156770] Modules linked in: hid_multitouch snd_hda_codec_realtek(O) snd_hda_codec_hdmi(O) snd_hda_intel(O) snd_hda_codec(O) snd_hwdep coretemp kvm_intel snd_pcm kvm ghash_clmulni_intel cryptd snd_seq_midi joydev snd_rawmidi dell_laptop dcdbas dell_wmi sparse_keymap dm_multipath scsi_dh lib80211_crypt_tkip snd_seq_midi_event microcode psmouse wl(PO) bnep snd_seq uvcvideo videobuf2_core videodev videobuf2_vmalloc snd_timer cfg80211 snd_seq_device btusb videobuf2_memops serio_raw parport_pc lib80211 rfcomm ppdev i915_hsw bluetooth snd soundcore snd_page_alloc wmi drm_kms_helper drm i2c_algo_bit intel_ips video mac_hid lp parport usbhid hid dm_raid45 xor dm_mirror dm_region_hash dm_log btrfs zlib_deflate libcrc32c r8168(O) [last unloaded: hid_multitouch]
  Jul 3 00:33:48 1704 kernel: [ 2365.156867] Pid: 25680, comm: kworker/0:2 Tainted: P W IO 3.5.0-22-generic #34~precise1-Ubuntu
  Jul 3 00:33:48 1704 kernel: [ 2365.156870] Call Trace:
  Jul 3 00:33:48 1704 kernel: [ 2365.156881] [<ffffffff81052c9f>] warn_slowpath_common+0x7f/0xc0
  Jul 3 00:33:48 1704 kernel: [ 2365.156887] [<ffffffff81052cfa>] warn_slowpath_null+0x1a/0x20
  Jul 3 00:33:48 1704 kernel: [ 2365.156894] [<ffffffff81437575>] request_firmware+0xb5/0xf0
  Jul 3 00:33:48 1704 kernel: [ 2365.156912] [<ffffffffa02ee470>] ? hci_dev_open+0x290/0x290 [bluetooth]
  Jul 3 00:33:48 1704 kernel: [ 2365.156922] [<ffffffffa0337b0a>] btusb_load_firmware+0xba/0x240 [btusb]
  Jul 3 00:33:48 1704 kernel: [ 2365.156936] [<ffffffffa02ee324>] hci_dev_open+0x144/0x290 [bluetooth]
  Jul 3 00:33:48 1704 kernel: [ 2365.156949] [<ffffffffa02ee48d>] hci_power_on+0x1d/0x80 [bluetooth]
  Jul 3 00:33:48 1704 kernel: [ 2365.156958] [<ffffffff81071bba>] process_one_work+0x11a/0x480
  Jul 3 00:33:48 1704 kernel: [ 2365.156964] [<ffffffff81072bd5>] worker_thread+0x165/0x370
  Jul 3 00:33:48 1704 kernel: [ 2365.156971] [<ffffffff81072a70>] ? manage_workers.isra.29+0x130/0x130
  Jul 3 00:33:48 1704 kernel: [ 2365.156977] [<ffffffff81077b73>] kthread+0x93/0xa0
  Jul 3 00:33:48 1704 kernel: [ 2365.156985] [<ffffffff816a8524>] kernel_thread_helper+0x4/0x10
  Jul 3 00:33:48 1704 kernel: [ 2365.156990] [<ffffffff81077ae0>] ? flush_kthread_worker+0xb0/0xb0
  Jul 3 00:33:48 1704 kernel: [ 2365.156996] [<ffffffff816a8520>] ? gs_change+0x13/0x13
  Jul 3 00:33:48 1704 kernel: [ 2365.156999] ---[ end trace 4ef11670192df83d ]---
  Jul 3 00:33:48 1704 kernel: [ 2365.157006] usb 1-1.7: firmware: fw-0a5c_21d7.hcd will not be loaded
  Jul 3 00:33:48 1704 kernel: [ 2365.159451] Bluetooth: can't load firmware, may not work correctly
  Jul 3 00:33:48 1704 kernel: [ 2365.164446] done.

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