I have subscribed Konrad to this bug. He told me he had spent time
debugging this issue in the past.

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https://bugs.launchpad.net/bugs/1454450

Title:
  Bluetooth mouse laggy and erratic

Status in bluez package in Ubuntu:
  Confirmed
Status in linux-firmware package in Ubuntu:
  Confirmed

Bug description:
  I installed Ubuntu 15.04 (64 bit) on a DELL XPS 13 (model 9343, bios
  A03) notebook. I use a DELL bluetooth mouse but sometimes it behaves
  erratically (laggy, jumpy). The problem happens after a few (sometimes
  one) suspend and resume. I am attaching below some info on my system.
  Thank you.

  cribari@darwin4:~$ uname -a; lspci -nnk | grep -iA2 net; lsusb; dmesg | grep 
-i bluetooth; dmesg | grep -i firmware; lsmod | grep bluetooth
  Linux darwin4 3.19.0-17-generic #17-Ubuntu SMP Wed May 6 16:46:12 UTC 2015 
x86_64 x86_64 x86_64 GNU/Linux
  02:00.0 Network controller [0280]: Broadcom Corporation BCM4352 802.11ac 
Wireless Network Adapter [14e4:43b1] (rev 03)
   Subsystem: Dell Device [1028:0019]
   Kernel driver in use: wl
  Bus 003 Device 002: ID 8087:8001 Intel Corp.
  Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Bus 001 Device 004: ID 0c45:670c Microdia
  Bus 001 Device 003: ID 04f3:20d0 Elan Microelectronics Corp.
  Bus 001 Device 002: ID 0a5c:216f Broadcom Corp.
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  [    2.174367] Bluetooth: Core ver 2.20
  [    2.174669] Bluetooth: HCI device and connection manager initialized
  [    2.174792] Bluetooth: HCI socket layer initialized
  [    2.174795] Bluetooth: L2CAP socket layer initialized
  [    2.175449] Bluetooth: SCO socket layer initialized
  [    2.592936] Bluetooth: hci0: BCM: patching hci_ver=06 hci_rev=1624 
lmp_ver=06 lmp_subver=220e
  [    3.203438] Bluetooth: hci0: BCM: firmware hci_ver=06 hci_rev=1624 
lmp_ver=06 lmp_subver=220e
  [    3.542418] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
  [    3.542421] Bluetooth: BNEP filters: protocol multicast
  [    3.542425] Bluetooth: BNEP socket layer initialized
  [    3.551641] Bluetooth: RFCOMM TTY layer initialized
  [    3.551649] Bluetooth: RFCOMM socket layer initialized
  [    3.551654] Bluetooth: RFCOMM ver 1.11
  [   26.569283] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
  [   26.569287] Bluetooth: HIDP socket layer initialized
  [   26.576971] input: Dell Travel Mouse WM524 as 
/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/bluetooth/hci0/hci0:11/0005:046D:B00E.0003/input/input15
  [   26.577172] hid-generic 0005:046D:B00E.0003: input,hidraw2: BLUETOOTH HID 
v8.00 Mouse [Dell Travel Mouse WM524] on ac:d1:b8:c0:6f:5c
  [   72.448281] input: Dell Travel Mouse WM524 as 
/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/bluetooth/hci0/hci0:12/0005:046D:B00E.0004/input/input16
  [   72.448526] hid-generic 0005:046D:B00E.0004: input,hidraw2: BLUETOOTH HID 
v8.00 Mouse [Dell Travel Mouse WM524] on ac:d1:b8:c0:6f:5c
  [ 2994.842547] input: Dell Travel Mouse WM524 as 
/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/bluetooth/hci0/hci0:13/0005:046D:B00E.0005/input/input17
  [ 2994.842810] hid-generic 0005:046D:B00E.0005: input,hidraw2: BLUETOOTH HID 
v8.00 Mouse [Dell Travel Mouse WM524] on ac:d1:b8:c0:6f:5c
  [ 3694.214037] Bluetooth: hci0: BCM: patching hci_ver=06 hci_rev=1000 
lmp_ver=06 lmp_subver=220e
  [ 3694.861578] Bluetooth: hci0: BCM: firmware hci_ver=06 hci_rev=1624 
lmp_ver=06 lmp_subver=220e
  [ 3811.777260] input: Dell Travel Mouse WM524 as 
/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/bluetooth/hci0/hci0:11/0005:046D:B00E.0006/input/input20
  [ 3811.777571] hid-generic 0005:046D:B00E.0006: input,hidraw2: BLUETOOTH HID 
v8.00 Mouse [Dell Travel Mouse WM524] on ac:d1:b8:c0:6f:5c
  [ 5579.876192] Modules linked in: huawei_cdc_ncm cdc_wdm cdc_ncm option 
usb_wwan usbserial usbnet mii uas usb_storage hid_generic hidp nvram msr 
binfmt_misc rfcomm bnep nls_iso8859_1 intel_rapl iosf_mbi x86_pkg_temp_thermal 
dell_wmi sparse_keymap intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul 
dell_laptop dcdbas btusb crc32_pclmul bluetooth ghash_clmulni_intel 
hid_multitouch aesni_intel aes_x86_64 lrw uvcvideo gf128mul videobuf2_vmalloc 
glue_helper wl(POE) videobuf2_memops ablk_helper videobuf2_core cryptd 
v4l2_common videodev media joydev i915_bpo serio_raw i915 dell_led rtsx_pci_ms 
intel_ips memstick snd_hda_codec_realtek snd_soc_rt286 snd_hda_codec_generic 
cfg80211 snd_soc_core drm_kms_helper mei_me lpc_ich shpchp mei snd_compress 
snd_hda_intel snd_hda_controller drm snd_hda_codec i2c_algo_bit
  [ 5579.876223] Workqueue: hci0 hci_power_on [bluetooth]
  [ 5579.876261]  [<ffffffffc0e09561>] hci_dev_do_open+0xe1/0xa90 [bluetooth]
  [ 5579.876266]  [<ffffffffc0e0a6f0>] hci_power_on+0x40/0x200 [bluetooth]
  [ 5579.876284] bluetooth hci0: firmware: brcm/BCM20702A0-0a5c-216f.hcd will 
not be loaded
  [ 5579.876286] Bluetooth: hci0: BCM: patch brcm/BCM20702A0-0a5c-216f.hcd not 
found
  [ 9442.157757] Modules linked in: huawei_cdc_ncm cdc_wdm cdc_ncm option 
usb_wwan usbserial usbnet mii uas usb_storage hid_generic hidp nvram msr 
binfmt_misc rfcomm bnep nls_iso8859_1 intel_rapl iosf_mbi x86_pkg_temp_thermal 
dell_wmi sparse_keymap intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul 
dell_laptop dcdbas btusb crc32_pclmul bluetooth ghash_clmulni_intel 
hid_multitouch aesni_intel aes_x86_64 lrw uvcvideo gf128mul videobuf2_vmalloc 
glue_helper wl(POE) videobuf2_memops ablk_helper videobuf2_core cryptd 
v4l2_common videodev media joydev i915_bpo serio_raw i915 dell_led rtsx_pci_ms 
intel_ips memstick snd_hda_codec_realtek snd_soc_rt286 snd_hda_codec_generic 
cfg80211 snd_soc_core drm_kms_helper mei_me lpc_ich shpchp mei snd_compress 
snd_hda_intel snd_hda_controller drm snd_hda_codec i2c_algo_bit
  [ 9442.157787] Workqueue: hci0 hci_power_on [bluetooth]
  [ 9442.157810]  [<ffffffffc0e09561>] hci_dev_do_open+0xe1/0xa90 [bluetooth]
  [ 9442.157815]  [<ffffffffc0e0a6f0>] hci_power_on+0x40/0x200 [bluetooth]
  [ 9442.157844] bluetooth hci0: firmware: brcm/BCM20702A0-0a5c-216f.hcd will 
not be loaded
  [ 9442.157846] Bluetooth: hci0: BCM: patch brcm/BCM20702A0-0a5c-216f.hcd not 
found
  [ 9498.411674] input: Dell Travel Mouse WM524 as 
/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/bluetooth/hci0/hci0:11/0005:046D:B00E.0007/input/input25
  [ 9498.411880] hid-generic 0005:046D:B00E.0007: input,hidraw2: BLUETOOTH HID 
v8.00 Mouse [Dell Travel Mouse WM524] on ac:d1:b8:c0:6f:5c
  [10589.318323] input: Dell Travel Mouse WM524 as 
/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/bluetooth/hci0/hci0:11/0005:046D:B00E.0008/input/input26
  [10589.318513] hid-generic 0005:046D:B00E.0008: input,hidraw2: BLUETOOTH HID 
v8.00 Mouse [Dell Travel Mouse WM524] on ac:d1:b8:c0:6f:5c
  [10777.090455] input: Dell Travel Mouse WM524 as 
/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/bluetooth/hci0/hci0:11/0005:046D:B00E.0009/input/input27
  [10777.090668] hid-generic 0005:046D:B00E.0009: input,hidraw2: BLUETOOTH HID 
v8.00 Mouse [Dell Travel Mouse WM524] on ac:d1:b8:c0:6f:5c
  [10813.977023] input: Dell Travel Mouse WM524 as 
/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/bluetooth/hci0/hci0:11/0005:046D:B00E.000A/input/input28
  [10813.977156] hid-generic 0005:046D:B00E.000A: input,hidraw2: BLUETOOTH HID 
v8.00 Mouse [Dell Travel Mouse WM524] on ac:d1:b8:c0:6f:5c
  [10945.835463] Bluetooth: hci0: BCM: patching hci_ver=06 hci_rev=1000 
lmp_ver=06 lmp_subver=220e
  [10946.457962] Bluetooth: hci0: BCM: firmware hci_ver=06 hci_rev=1624 
lmp_ver=06 lmp_subver=220e
  [    3.203438] Bluetooth: hci0: BCM: firmware hci_ver=06 hci_rev=1624 
lmp_ver=06 lmp_subver=220e
  [ 3694.861578] Bluetooth: hci0: BCM: firmware hci_ver=06 hci_rev=1624 
lmp_ver=06 lmp_subver=220e
  [ 5579.876160] WARNING: CPU: 2 PID: 6270 at 
/build/buildd/linux-3.19.0/drivers/base/firmware_class.c:1126 
_request_firmware+0x72e/0xbd0()
  [ 5579.876238]  [<ffffffff815196ca>] ? _request_firmware+0x5a/0xbd0
  [ 5579.876241]  [<ffffffff81519d9e>] _request_firmware+0x72e/0xbd0
  [ 5579.876243]  [<ffffffff8151a275>] request_firmware+0x35/0x50
  [ 5579.876284] bluetooth hci0: firmware: brcm/BCM20702A0-0a5c-216f.hcd will 
not be loaded
  [ 9442.157726] WARNING: CPU: 3 PID: 9280 at 
/build/buildd/linux-3.19.0/drivers/base/firmware_class.c:1126 
_request_firmware+0x72e/0xbd0()
  [ 9442.157798]  [<ffffffff815196ca>] ? _request_firmware+0x5a/0xbd0
  [ 9442.157800]  [<ffffffff81519d9e>] _request_firmware+0x72e/0xbd0
  [ 9442.157801]  [<ffffffff8151a275>] request_firmware+0x35/0x50
  [ 9442.157844] bluetooth hci0: firmware: brcm/BCM20702A0-0a5c-216f.hcd will 
not be loaded
  [10946.457962] Bluetooth: hci0: BCM: firmware hci_ver=06 hci_rev=1624 
lmp_ver=06 lmp_subver=220e
  bluetooth             491520  23 bnep,hidp,btusb,rfcomm
  cribari@darwin4:~$

  cribari@darwin4:~$ sudo service bluetooth status
  [sudo] password for cribari:
  ● bluetooth.service - Bluetooth service
     Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor 
preset: enabled)
     Active: active (running) since Ter 2015-05-12 14:21:44 BRT; 2h 48min left
   Main PID: 683 (bluetoothd)
     CGroup: /system.slice/bluetooth.service
             └─683 /usr/sbin/bluetoothd -n

  Mai 12 11:22:52 darwin4 bluetoothd[683]: Endpoint unregistered: 
sender=:1.40...e
  Mai 12 11:22:52 darwin4 bluetoothd[683]: Endpoint unregistered: 
sender=:1.40...k
  Mai 12 11:22:52 darwin4 bluetoothd[683]: bluetoothd[683]: Endpoint 
unregiste...G
  Mai 12 11:22:52 darwin4 bluetoothd[683]: bluetoothd[683]: Endpoint 
unregiste...S
  Mai 12 11:22:52 darwin4 bluetoothd[683]: bluetoothd[683]: Endpoint 
unregiste...e
  Mai 12 11:22:52 darwin4 bluetoothd[683]: bluetoothd[683]: Endpoint 
unregiste...k
  Mai 12 11:23:18 darwin4 bluetoothd[683]: bluetoothd[683]: Unknown command 
co...7
  Mai 12 11:23:18 darwin4 bluetoothd[683]: Unknown command complete for opcode 
37
  Mai 12 11:23:23 darwin4 bluetoothd[683]: bluetoothd[683]: Unknown command 
co...7
  Mai 12 11:23:23 darwin4 bluetoothd[683]: Unknown command complete for opcode 
37
  Hint: Some lines were ellipsized, use -l to show in full.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: bluez 4.101-0ubuntu25
  ProcVersionSignature: Ubuntu 3.19.0-17.17-generic 3.19.6
  Uname: Linux 3.19.0-17-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  Date: Tue May 12 20:12:13 2015
  ExecutablePath: /usr/sbin/bluetoothd
  InstallationDate: Installed on 2015-04-23 (19 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  InterestingModules: rfcomm bnep btusb bluetooth
  MachineType: Dell Inc. XPS 13 9343
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-17-generic.efi.signed 
root=UUID=b1bc4e7b-3e8b-45bd-9b9b-cd95b9cbbec1 ro quiet splash 
i915.i915_enable_rc6=0 vt.handoff=7
  SourcePackage: bluez
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/25/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A03
  dmi.board.name: 0310JH
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA03:bd03/25/2015:svnDellInc.:pnXPS139343:pvr01:rvnDellInc.:rn0310JH:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9343
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.
  hciconfig:
   hci0:        Type: BR/EDR  Bus: USB
    BD Address: AC:D1:B8:C0:6F:5C  ACL MTU: 1021:8  SCO MTU: 64:1
    UP RUNNING PSCAN
    RX bytes:1491155 acl:74655 sco:0 events:8833 errors:0
    TX bytes:38138 acl:88 sco:0 commands:253 errors:0

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