I believe i'm suffering from the same issue. The headset is Nokia BH-216 with Dell Latitude E6510 and Ubuntu 14.04.
Connection can work for 20 minutes, or disconnect in one. After reconnecting it again works for a while. Dmesg is flooded with lines like this: [ 3424.806640] Bluetooth: hci0 SCO packet for unknown connection handle 6 [ 3424.806644] Bluetooth: hci0 SCO packet for unknown connection handle 6 [ 3499.700652] Bluetooth: hci0 SCO packet for unknown connection handle 6 [ 3499.700658] Bluetooth: hci0 SCO packet for unknown connection handle 6 [ 3499.700661] Bluetooth: hci0 SCO packet for unknown connection handle 6 Linux villendell 3.13.0-39-generic #66-Ubuntu SMP Tue Oct 28 13:30:27 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/898347 Title: syslog flooded with "hci_scodata_packet: hci0 SCO packet for unknown connection handle" Status in “linux” package in Ubuntu: Confirmed Bug description: I am experiencing unstable bluetooth connections between a USB bluetooth dongle and headset. I get a ton of lines like Dec 1 04:09:51 localhost kernel: [ 264.372205] hci_scodata_packet: hci0 SCO packet for unknown connection handle 65261 in syslog. The bluetooth connection also usually breaks down about 10 seconds into a Skype call. I cannot know if the two phenomena are actually related. Dec 1 04:09:52 localhost kernel: [ 264.392198] hci_scodata_packet: hci0 SCO packet for unknown connection handle 65072 Dec 1 04:09:52 localhost kernel: [ 264.402199] hci_scodata_packet: hci0 SCO packet for unknown connection handle 65493 Dec 1 04:10:26 localhost bluetoothd[1756]: Audio connection got disconnected Dec 1 04:10:26 localhost pulseaudio[1936]: ratelimit.c: 4802 events suppressed Dec 1 04:10:35 localhost pulseaudio[1936]: ratelimit.c: 428 events suppressed I believe this is a Ubuntu-induced regression, I was unable to reproduce the problem with a mainline kernel today. confirmed affected: vmlinuz-2.6.32-35-generic (latest lucid kernel) confirmed affected: vmlinuz-3.0.0-13-generic apparently unaffected: vmlinuz-3.2.0-999-generic from today (or rather Nov 30th) FWIW, the mainline kernel seems to have a stable bluetooth connection but syslog gets flooded there as well. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/898347/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp