I have bluetooth headphones (Jabra Elite 65t) and bluetooth dongle (Asus
USB-BT500).

They work at first but when the dongle goes into USB powersave, the headphones
get disconnected and don't reconnect properly unless I reinsert the dongle.

When it's all good, the headphones appear as High Fidelity Playback A2DP Sink,
codec AAC.

hwinfo --bluetooth
05: USB 00.1: 11500 Bluetooth Device                            
  [Created at usb.122]
  Unique ID: XN68.bg_nBq8ya6A
  Parent ID: KgLP.erpEvbsFWX1
  SysFS ID: /devices/pci0000:00/0000:00:13.0/usb9/9-4/9-4:1.1
  SysFS BusID: 9-4:1.1
  Hardware Class: bluetooth
  Model: "ASUSTek ASUS USB-BT500"
  Hotplug: USB
  Vendor: usb 0x0b05 "ASUSTek Computer, Inc."
  Device: usb 0x190e "ASUS USB-BT500"
  Revision: "2.00"
  Serial ID: "00E04C239987"
  Driver: "btusb"
  Driver Modules: "btusb"
  Speed: 12 Mbps
  Module Alias: "usb:v0B05p190Ed0200dcE0dsc01dp01icE0isc01ip01in01"
  Driver Info #0:
    Driver Status: btusb is active
    Driver Activation Cmd: "modprobe btusb"
  Config Status: cfg=new, avail=yes, need=no, active=unknown
  Attached to: #14 (Hub)

dmesg | grep Bluetooth
[    6.357471] Bluetooth: Core ver 2.22
[    6.357495] Bluetooth: HCI device and connection manager initialized
[    6.357499] Bluetooth: HCI socket layer initialized
[    6.357502] Bluetooth: L2CAP socket layer initialized
[    6.357506] Bluetooth: SCO socket layer initialized
[    6.413147] Bluetooth: hci0: RTL: examining hci_ver=0a hci_rev=000b
lmp_ver=0a lmp_subver=8761
[    6.415122] Bluetooth: hci0: RTL: rom_version status=0 version=1
[    6.415126] Bluetooth: hci0: RTL: loading rtl_bt/rtl8761bu_fw.bin
[    6.439520] Bluetooth: hci0: RTL: loading rtl_bt/rtl8761bu_config.bin
[    6.444090] Bluetooth: hci0: RTL: cfg_sz 6, total sz 30210
[    6.715122] Bluetooth: hci0: RTL: fw version 0xdfc6d922
[    6.841248] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[    6.841252] Bluetooth: BNEP filters: protocol multicast
[    6.841257] Bluetooth: BNEP socket layer initialized
[    6.843260] Bluetooth: MGMT ver 1.22
[   50.972325] Bluetooth: RFCOMM TTY layer initialized
[   50.972333] Bluetooth: RFCOMM socket layer initialized
[   50.972338] Bluetooth: RFCOMM ver 1.11
...
[   54.394435] input: Jabra Elite 65t (AVRCP) as /devices/virtual/input/input19

I see this in dmesg when it reconnects and it works:

[  486.890067] usb 9-4: USB disconnect, device number 2
[  487.114036] usb 9-4: new full-speed USB device number 3 using ohci-pci
[  487.351164] usb 9-4: New USB device found, idVendor=0b05, idProduct=190e,
bcdDevice= 2.00
[  487.351171] usb 9-4: New USB device strings: Mfr=1, Product=2,
SerialNumber=3
[  487.351173] usb 9-4: Product: ASUS USB-BT500
[  487.351175] usb 9-4: Manufacturer: Realtek
[  487.351177] usb 9-4: SerialNumber: 00E04C239987
[  487.358124] Bluetooth: hci1: RTL: examining hci_ver=0a hci_rev=dfc6
lmp_ver=0a lmp_subver=d922
[  487.568138] Bluetooth: hci1: RTL: examining hci_ver=0a hci_rev=000b
lmp_ver=0a lmp_subver=8761
[  487.570174] Bluetooth: hci1: RTL: rom_version status=0 version=1
[  487.570177] Bluetooth: hci1: RTL: loading rtl_bt/rtl8761bu_fw.bin
[  487.572606] Bluetooth: hci1: RTL: loading rtl_bt/rtl8761bu_config.bin
[  487.572715] Bluetooth: hci1: RTL: cfg_sz 6, total sz 30210
[  487.842193] Bluetooth: hci1: RTL: fw version 0xdfc6d922
[  487.944392] Bluetooth: MGMT ver 1.22
[  493.763658] input: Jabra Elite 65t (AVRCP) as /devices/virtual/input/input20

And many of these when it disconnects and doesn't work anymore:

[  852.621709] usb 9-4: reset full-speed USB device number 3 using ohci-pci
[  856.465806] usb 9-4: reset full-speed USB device number 3 using ohci-pci
[  859.097858] usb 9-4: reset full-speed USB device number 3 using ohci-pci

Then this:
[  923.675107] Bluetooth: hci1: command 0x0428 tx timeout

[  963.676107] Bluetooth: hci1: killing stalled connection 70:bf:92:6b:13:31
[  965.176409] Bluetooth: hci1: link tx timeout
[  965.176429] Bluetooth: hci1: killing stalled connection 70:bf:92:6b:13:31
[  965.692007] Bluetooth: hci1: command 0x041f tx timeout
[  967.712098] Bluetooth: hci1: command 0x0406 tx timeout
[  968.516073] usb 9-4: reset full-speed USB device number 3 using ohci-pci
[  969.698590] Bluetooth: hci1: link tx timeout
[  969.698605] Bluetooth: hci1: killing stalled connection 70:bf:92:6b:13:31
[  971.512214] usb 9-4: reset full-speed USB device number 3 using ohci-pci
[  974.560260] usb 9-4: reset full-speed USB device number 3 using ohci-pci
...
[ 1080.406158] Bluetooth: hci1: killing stalled connection 70:bf:92:6b:13:31
[ 1082.334436] Bluetooth: hci1: command 0x0408 tx timeout
[ 1082.334458] Bluetooth: hci1: No gpio to reset Realtek device, ignoring
[ 1084.350582] Bluetooth: hci1: command 0x0408 tx timeout
[ 1084.350603] Bluetooth: hci1: No gpio to reset Realtek device, ignoring