After update to 13.04, my apple wireless keyboard (bluetooth) stops working after a few minutes. It may be related to the same issue, as I have the same error message in the kernel log:

[  171.061649] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
[  171.061663] Bluetooth: HIDP socket layer initialized
[  171.469709] apple 0005:05AC:023A.0004: unknown main item tag 0x0
[  171.501005] input: Apple Wireless Keyboard as /devices/pci0000:00/0000:00:12.2/usb1/1-4/1-4.2/1-4.2:1.0/bluetooth/hci0/hci0:12/input16
[  171.501226] apple 0005:05AC:023A.0004: input,hidraw3: BLUETOOTH HID v0.50 Keyboard [Apple Wireless Keyboard] on 00:02:72:3f:ca:24
[  174.435365] usb 1-4.4: USB disconnect, device number 7
[  305.485226] power_supply hid-e8:06:88:41:78:de-battery: driver failed to report `capacity' property: -5
[  305.485254] power_supply hid-e8:06:88:41:78:de-battery: driver failed to report `capacity' property: -5
[  314.034459] apple 0005:05AC:023A.0005: unknown main item tag 0x0
[  314.064000] input: Apple Wireless Keyboard as /devices/pci0000:00/0000:00:12.2/usb1/1-4/1-4.2/1-4.2:1.0/bluetooth/hci0/hci0:12/input17
[  314.064367] apple 0005:05AC:023A.0005: input,hidraw2: BLUETOOTH HID v0.50 Keyboard [Apple Wireless Keyboard] on 00:02:72:3f:ca:24
[  314.132615] do_trap: 42 callbacks suppressed
[  314.132626] traps: upowerd[2325] trap int3 ip:7fe4f3c772c5 sp:7fff10e4f590 error:0
[  728.013999] init: mountall main process (370) terminated with status 1
[  728.014400] init: upstart-file-bridge main process (380) terminated with status 1
[  728.014449] init: upstart-file-bridge main process ended, respawning
[  728.014710] init: upstart-udev-bridge main process (483) terminated with status 1
[  728.014756] init: upstart-udev-bridge main process ended, respawning
[  728.015117] init: upstart-socket-bridge main process (778) terminated with status 1
[  728.015166] init: upstart-socket-bridge main process ended, respawning
[  728.049264] init: plymouth-stop pre-start process (5004) terminated with status 1
[  728.831905] init: upstart-udev-bridge main process (5007) terminated with status 1
[  728.831975] init: upstart-udev-bridge main process ended, respawning
[  728.832303] init: upstart-socket-bridge main process (5009) terminated with status 1
[  728.832352] init: upstart-socket-bridge main process ended, respawning
[  728.832625] init: upstart-file-bridge main process (5011) terminated with status 1
[  728.832670] init: upstart-file-bridge main process ended, respawning
[  988.148438] power_supply hid-e8:06:88:41:78:de-battery: driver failed to report `capacity' property: -5
[  988.148466] power_supply hid-e8:06:88:41:78:de-battery: driver failed to report `capacity' property: -5
[  992.243098] apple 0005:05AC:023A.0006: unknown main item tag 0x0
[  992.272772] input: Apple Wireless Keyboard as /devices/pci0000:00/0000:00:12.2/usb1/1-4/1-4.2/1-4.2:1.0/bluetooth/hci0/hci0:12/input18
[  992.273023] apple 0005:05AC:023A.0006: input,hidraw2: BLUETOOTH HID v0.50 Keyboard [Apple Wireless Keyboard] on 00:02:72:3f:ca:24
[  992.330047] traps: upowerd[3874] trap int3 ip:7f58431ae2c5 sp:7fff53378150 error:0
[  992.890086] power_supply hid-e8:06:88:41:78:de-battery: driver failed to report `capacity' property: -5
[  992.890096] power_supply hid-e8:06:88:41:78:de-battery: driver failed to report `capacity' property: -5
[  996.742562] apple 0005:05AC:023A.0007: unknown main item tag 0x0
[  996.770784] input: Apple Wireless Keyboard as /devices/pci0000:00/0000:00:12.2/usb1/1-4/1-4.2/1-4.2:1.0/bluetooth/hci0/hci0:12/input19
[  996.771128] apple 0005:05AC:023A.0007: input,hidraw2: BLUETOOTH HID v0.50 Keyboard [Apple Wireless Keyboard] on 00:02:72:3f:ca:24
[  997.617518] power_supply hid-e8:06:88:41:78:de-battery: driver failed to report `capacity' property: -5
[  997.617546] power_supply hid-e8:06:88:41:78:de-battery: driver failed to report `capacity' property: -5
[ 1034.148636] apple 0005:05AC:023A.0008: unknown main item tag 0x0
[ 1039.146928] power_supply hid-e8:06:88:41:78:de-battery: driver failed to report `capacity' property: -5
[ 1039.147163] input: Apple Wireless Keyboard as /devices/pci0000:00/0000:00:12.2/usb1/1-4/1-4.2/1-4.2:1.0/bluetooth/hci0/hci0:12/input20
[ 1039.147436] apple 0005:05AC:023A.0008: input,hidraw2: BLUETOOTH HID v0.50 Keyboard [Apple Wireless Keyboard] on 00:02:72:3f:ca:24
[ 1044.145903] power_supply hid-e8:06:88:41:78:de-battery: driver failed to report `capacity' property: -5
[ 1062.641773] power_supply hid-e8:06:88:41:78:de-battery: driver failed to report `capacity' property: -5
[ 1119.146712] apple 0005:05AC:023A.0009: unknown main item tag 0x0
[ 1119.183339] input: Apple Wireless Keyboard as /devices/pci0000:00/0000:00:12.2/usb1/1-4/1-4.2/1-4.2:1.0/bluetooth/hci0/hci0:13/input21
[ 1119.183576] apple 0005:05AC:023A.0009: input,hidraw2: BLUETOOTH HID v0.50 Keyboard [Apple Wireless Keyboard] on 00:02:72:3f:ca:24
[ 1119.243182] power_supply hid-e8:06:88:41:78:de-battery: driver failed to report `capacity' property: -5
[ 1119.243272] power_supply hid-e8:06:88:41:78:de-battery: driver failed to report `capacity' property: -5
[ 1119.243300] power_supply hid-e8:06:88:41:78:de-battery: driver failed to report `capacity' property: -5