[Touch-packages] [Bug 1886714] Re: [Broadcom BCM20702A0] Bluetooth disconnects, and then sound fails on reconnect
The bug is still present in Ubuntu 22.10 on a Gigabyte Technology Co., Ltd. GA-990FXA-UD3, when attached to an HK Onyx Studio 6. Usually a work around is to restart the Bluetooth stack twice. My wild guess is that a (ring) buffer in the Bluetooth stack is filled, and isn't reset because the sound system can't catch up. It then goes on until it crashes. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to bluez in Ubuntu. https://bugs.launchpad.net/bugs/1886714 Title: [Broadcom BCM20702A0] Bluetooth disconnects, and then sound fails on reconnect Status in bluez package in Ubuntu: New Status in linux package in Ubuntu: Confirmed Bug description: This bug has persisted over several years, and several versions, and after a lot of investigation I'm not really any closer on what's going on. I have two pretty old GA MA78gm S2H mainboards, configured slightly different, and otherwise working properly. Both of them have run both Ubuntu and Windows. The problem seems to have been minimized when running Win10, and even if it is there it seems like Win10 recover when it happen. I wonder if I started noticing the problem under Ubuntu 14.x, but I'm pretty sure it was there already at Ubuntu 16.x. I'm now running Ubuntu 19.10 and Gnome 3.34.2. (Just for the record, the bug also persisted in Ubu 18.04 for as long as I was using it.) It isn't really an option to switch the mainboards, as there are too much custom-builds running on them for the moment. They will probably be replaced when I have time to rebuild everything. ;) To make Bluetooth work I use an ASUS USB-BT400, which report as “BCM920702 Bluetooth 4.0”, or more accurately “BCM20702A1 (001.002.014) build 1467”. I have also used other dongles, but it seems like all of them has the same chipset. Now… Given I restart the computer And boot into Ubuntu 19.10 And log in as myself And attach a pair of Sony MDR-ZX770BN When I listen to sound from a movie with A2DP Then at some random point it start to lag noticeably (sound becomes scratchy) And suddenly disconnects (at this point it seems like it is Bluetooth that disconnects) It may take 5–10 minutes and up to several hours before it disconnects. Given I turn the headphones off And back on When it reconnects to the computer Then the computer fails to enable the sound device (visible in the preference manager f.ex.) There are several reports of various equipments that disconnect, and I wonder if this could be the same problem. Problem 1 The dongle is rather hot when it disconnects. This is mere speculation, but I wonder if the disconnect happen because either the mainboard gives to little current and thus it fails due to voltage drop, or it fails due to overheating. It seems like the port should have enough current to sustain the dongle, but I wonder if the mainboard could let several ports share the same power source, and thus it fail to deliver enough current. There are other devices powered by the USB ports, and they don't seem to fail, which seems likely to happen if power is the issue. The issue seems to be somewhat related to the quality of the audio, which makes me wonder whether higher quality gives more transferred data, which again gives higher power consumption. It also seems like the issue can be triggered by moving away from the computer. That would give higher tx power, which could make the dongle overheat or mainboard could fail to provide enough current. Is there any way to get a more specific failure report from the dongle? Problem 2 After the headphone reconnects it seems like the sound system isn't working properly. I've been checking, and everything seems correct, still the headphone is missing as an output device. I have not been able to figure out what makes the sound system fail, and I have not been able to make it recover. Only way to recover seems to be to do a cold reboot. A simple warm reboot does not fix the problem, but this can be related to problem 1. A few dumps john@hydra:~$ dmesg | fgrep 'Blue' [3.089584] usb 1-2.2: Product: BCM920702 Bluetooth 4.0 [8.417252] Bluetooth: Core ver 2.22 [8.417280] Bluetooth: HCI device and connection manager initialized [8.417284] Bluetooth: HCI socket layer initialized [8.417286] Bluetooth: L2CAP socket layer initialized [8.417301] Bluetooth: SCO socket layer initialized [8.779706] Bluetooth: hci0: BCM: chip id 63 [8.780703] Bluetooth: hci0: BCM: features 0x07 [8.796682] Bluetooth: hci0: hydra [8.800667] Bluetooth: hci0: BCM20702A1 (001.002.014) build 1467 [9.671568] Bluetooth: hci0: BCM20702A1 (001.002.014) build 1467 [9.687584] Bluetooth: hci0: Broadcom Bluetooth Device [ 10.571440] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 10.571442] Bluetooth: BNEP fi
[Touch-packages] [Bug 1886714] Re: [Broadcom BCM20702A0] Bluetooth disconnects, and then sound fails on reconnect
I'm pretty sure this is the same bug https://bugs.freedesktop.org/show_bug.cgi?id=58746 There is a proposed patch at https://bugs.freedesktop.org/show_bug.cgi?id=58746#c14 ** Bug watch added: freedesktop.org Bugzilla #58746 https://bugs.freedesktop.org/show_bug.cgi?id=58746 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to bluez in Ubuntu. https://bugs.launchpad.net/bugs/1886714 Title: [Broadcom BCM20702A0] Bluetooth disconnects, and then sound fails on reconnect Status in bluez package in Ubuntu: New Status in linux package in Ubuntu: Confirmed Bug description: This bug has persisted over several years, and several versions, and after a lot of investigation I'm not really any closer on what's going on. I have two pretty old GA MA78gm S2H mainboards, configured slightly different, and otherwise working properly. Both of them have run both Ubuntu and Windows. The problem seems to have been minimized when running Win10, and even if it is there it seems like Win10 recover when it happen. I wonder if I started noticing the problem under Ubuntu 14.x, but I'm pretty sure it was there already at Ubuntu 16.x. I'm now running Ubuntu 19.10 and Gnome 3.34.2. (Just for the record, the bug also persisted in Ubu 18.04 for as long as I was using it.) It isn't really an option to switch the mainboards, as there are too much custom-builds running on them for the moment. They will probably be replaced when I have time to rebuild everything. ;) To make Bluetooth work I use an ASUS USB-BT400, which report as “BCM920702 Bluetooth 4.0”, or more accurately “BCM20702A1 (001.002.014) build 1467”. I have also used other dongles, but it seems like all of them has the same chipset. Now… Given I restart the computer And boot into Ubuntu 19.10 And log in as myself And attach a pair of Sony MDR-ZX770BN When I listen to sound from a movie with A2DP Then at some random point it start to lag noticeably (sound becomes scratchy) And suddenly disconnects (at this point it seems like it is Bluetooth that disconnects) It may take 5–10 minutes and up to several hours before it disconnects. Given I turn the headphones off And back on When it reconnects to the computer Then the computer fails to enable the sound device (visible in the preference manager f.ex.) There are several reports of various equipments that disconnect, and I wonder if this could be the same problem. Problem 1 The dongle is rather hot when it disconnects. This is mere speculation, but I wonder if the disconnect happen because either the mainboard gives to little current and thus it fails due to voltage drop, or it fails due to overheating. It seems like the port should have enough current to sustain the dongle, but I wonder if the mainboard could let several ports share the same power source, and thus it fail to deliver enough current. There are other devices powered by the USB ports, and they don't seem to fail, which seems likely to happen if power is the issue. The issue seems to be somewhat related to the quality of the audio, which makes me wonder whether higher quality gives more transferred data, which again gives higher power consumption. It also seems like the issue can be triggered by moving away from the computer. That would give higher tx power, which could make the dongle overheat or mainboard could fail to provide enough current. Is there any way to get a more specific failure report from the dongle? Problem 2 After the headphone reconnects it seems like the sound system isn't working properly. I've been checking, and everything seems correct, still the headphone is missing as an output device. I have not been able to figure out what makes the sound system fail, and I have not been able to make it recover. Only way to recover seems to be to do a cold reboot. A simple warm reboot does not fix the problem, but this can be related to problem 1. A few dumps john@hydra:~$ dmesg | fgrep 'Blue' [3.089584] usb 1-2.2: Product: BCM920702 Bluetooth 4.0 [8.417252] Bluetooth: Core ver 2.22 [8.417280] Bluetooth: HCI device and connection manager initialized [8.417284] Bluetooth: HCI socket layer initialized [8.417286] Bluetooth: L2CAP socket layer initialized [8.417301] Bluetooth: SCO socket layer initialized [8.779706] Bluetooth: hci0: BCM: chip id 63 [8.780703] Bluetooth: hci0: BCM: features 0x07 [8.796682] Bluetooth: hci0: hydra [8.800667] Bluetooth: hci0: BCM20702A1 (001.002.014) build 1467 [9.671568] Bluetooth: hci0: BCM20702A1 (001.002.014) build 1467 [9.687584] Bluetooth: hci0: Broadcom Bluetooth Device [ 10.571440] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 10.571442] Bluetooth: BNEP filters: protocol multicast [ 10.571448] Bluetooth: BNEP socket layer initi
[Touch-packages] [Bug 1886714] Re: [Broadcom BCM20702A0] Bluetooth disconnects, and then sound fails on reconnect
If I restart and try to use my Sony headphones, then sound stutter and fails. If I run `sudo hcidump --ext avdtp`, then it works… This is weird! -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to bluez in Ubuntu. https://bugs.launchpad.net/bugs/1886714 Title: [Broadcom BCM20702A0] Bluetooth disconnects, and then sound fails on reconnect Status in bluez package in Ubuntu: New Status in linux package in Ubuntu: Confirmed Bug description: This bug has persisted over several years, and several versions, and after a lot of investigation I'm not really any closer on what's going on. I have two pretty old GA MA78gm S2H mainboards, configured slightly different, and otherwise working properly. Both of them have run both Ubuntu and Windows. The problem seems to have been minimized when running Win10, and even if it is there it seems like Win10 recover when it happen. I wonder if I started noticing the problem under Ubuntu 14.x, but I'm pretty sure it was there already at Ubuntu 16.x. I'm now running Ubuntu 19.10 and Gnome 3.34.2. (Just for the record, the bug also persisted in Ubu 18.04 for as long as I was using it.) It isn't really an option to switch the mainboards, as there are too much custom-builds running on them for the moment. They will probably be replaced when I have time to rebuild everything. ;) To make Bluetooth work I use an ASUS USB-BT400, which report as “BCM920702 Bluetooth 4.0”, or more accurately “BCM20702A1 (001.002.014) build 1467”. I have also used other dongles, but it seems like all of them has the same chipset. Now… Given I restart the computer And boot into Ubuntu 19.10 And log in as myself And attach a pair of Sony MDR-ZX770BN When I listen to sound from a movie with A2DP Then at some random point it start to lag noticeably (sound becomes scratchy) And suddenly disconnects (at this point it seems like it is Bluetooth that disconnects) It may take 5–10 minutes and up to several hours before it disconnects. Given I turn the headphones off And back on When it reconnects to the computer Then the computer fails to enable the sound device (visible in the preference manager f.ex.) There are several reports of various equipments that disconnect, and I wonder if this could be the same problem. Problem 1 The dongle is rather hot when it disconnects. This is mere speculation, but I wonder if the disconnect happen because either the mainboard gives to little current and thus it fails due to voltage drop, or it fails due to overheating. It seems like the port should have enough current to sustain the dongle, but I wonder if the mainboard could let several ports share the same power source, and thus it fail to deliver enough current. There are other devices powered by the USB ports, and they don't seem to fail, which seems likely to happen if power is the issue. The issue seems to be somewhat related to the quality of the audio, which makes me wonder whether higher quality gives more transferred data, which again gives higher power consumption. It also seems like the issue can be triggered by moving away from the computer. That would give higher tx power, which could make the dongle overheat or mainboard could fail to provide enough current. Is there any way to get a more specific failure report from the dongle? Problem 2 After the headphone reconnects it seems like the sound system isn't working properly. I've been checking, and everything seems correct, still the headphone is missing as an output device. I have not been able to figure out what makes the sound system fail, and I have not been able to make it recover. Only way to recover seems to be to do a cold reboot. A simple warm reboot does not fix the problem, but this can be related to problem 1. A few dumps john@hydra:~$ dmesg | fgrep 'Blue' [3.089584] usb 1-2.2: Product: BCM920702 Bluetooth 4.0 [8.417252] Bluetooth: Core ver 2.22 [8.417280] Bluetooth: HCI device and connection manager initialized [8.417284] Bluetooth: HCI socket layer initialized [8.417286] Bluetooth: L2CAP socket layer initialized [8.417301] Bluetooth: SCO socket layer initialized [8.779706] Bluetooth: hci0: BCM: chip id 63 [8.780703] Bluetooth: hci0: BCM: features 0x07 [8.796682] Bluetooth: hci0: hydra [8.800667] Bluetooth: hci0: BCM20702A1 (001.002.014) build 1467 [9.671568] Bluetooth: hci0: BCM20702A1 (001.002.014) build 1467 [9.687584] Bluetooth: hci0: Broadcom Bluetooth Device [ 10.571440] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 10.571442] Bluetooth: BNEP filters: protocol multicast [ 10.571448] Bluetooth: BNEP socket layer initialized [ 630.835385] Bluetooth: RFCOMM TTY layer initialized [ 630.835393] Bluetooth: RFCOMM socket layer initialized [ 630.8
[Touch-packages] [Bug 1886714] Re: [Broadcom BCM20702A0] Bluetooth disconnects, and then sound fails on reconnect
Several programs are updated, it could be that this works now even if the sound breaks up from time to time. I'll do some more testing. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to bluez in Ubuntu. https://bugs.launchpad.net/bugs/1886714 Title: [Broadcom BCM20702A0] Bluetooth disconnects, and then sound fails on reconnect Status in bluez package in Ubuntu: New Status in linux package in Ubuntu: Confirmed Bug description: This bug has persisted over several years, and several versions, and after a lot of investigation I'm not really any closer on what's going on. I have two pretty old GA MA78gm S2H mainboards, configured slightly different, and otherwise working properly. Both of them have run both Ubuntu and Windows. The problem seems to have been minimized when running Win10, and even if it is there it seems like Win10 recover when it happen. I wonder if I started noticing the problem under Ubuntu 14.x, but I'm pretty sure it was there already at Ubuntu 16.x. I'm now running Ubuntu 19.10 and Gnome 3.34.2. (Just for the record, the bug also persisted in Ubu 18.04 for as long as I was using it.) It isn't really an option to switch the mainboards, as there are too much custom-builds running on them for the moment. They will probably be replaced when I have time to rebuild everything. ;) To make Bluetooth work I use an ASUS USB-BT400, which report as “BCM920702 Bluetooth 4.0”, or more accurately “BCM20702A1 (001.002.014) build 1467”. I have also used other dongles, but it seems like all of them has the same chipset. Now… Given I restart the computer And boot into Ubuntu 19.10 And log in as myself And attach a pair of Sony MDR-ZX770BN When I listen to sound from a movie with A2DP Then at some random point it start to lag noticeably (sound becomes scratchy) And suddenly disconnects (at this point it seems like it is Bluetooth that disconnects) It may take 5–10 minutes and up to several hours before it disconnects. Given I turn the headphones off And back on When it reconnects to the computer Then the computer fails to enable the sound device (visible in the preference manager f.ex.) There are several reports of various equipments that disconnect, and I wonder if this could be the same problem. Problem 1 The dongle is rather hot when it disconnects. This is mere speculation, but I wonder if the disconnect happen because either the mainboard gives to little current and thus it fails due to voltage drop, or it fails due to overheating. It seems like the port should have enough current to sustain the dongle, but I wonder if the mainboard could let several ports share the same power source, and thus it fail to deliver enough current. There are other devices powered by the USB ports, and they don't seem to fail, which seems likely to happen if power is the issue. The issue seems to be somewhat related to the quality of the audio, which makes me wonder whether higher quality gives more transferred data, which again gives higher power consumption. It also seems like the issue can be triggered by moving away from the computer. That would give higher tx power, which could make the dongle overheat or mainboard could fail to provide enough current. Is there any way to get a more specific failure report from the dongle? Problem 2 After the headphone reconnects it seems like the sound system isn't working properly. I've been checking, and everything seems correct, still the headphone is missing as an output device. I have not been able to figure out what makes the sound system fail, and I have not been able to make it recover. Only way to recover seems to be to do a cold reboot. A simple warm reboot does not fix the problem, but this can be related to problem 1. A few dumps john@hydra:~$ dmesg | fgrep 'Blue' [3.089584] usb 1-2.2: Product: BCM920702 Bluetooth 4.0 [8.417252] Bluetooth: Core ver 2.22 [8.417280] Bluetooth: HCI device and connection manager initialized [8.417284] Bluetooth: HCI socket layer initialized [8.417286] Bluetooth: L2CAP socket layer initialized [8.417301] Bluetooth: SCO socket layer initialized [8.779706] Bluetooth: hci0: BCM: chip id 63 [8.780703] Bluetooth: hci0: BCM: features 0x07 [8.796682] Bluetooth: hci0: hydra [8.800667] Bluetooth: hci0: BCM20702A1 (001.002.014) build 1467 [9.671568] Bluetooth: hci0: BCM20702A1 (001.002.014) build 1467 [9.687584] Bluetooth: hci0: Broadcom Bluetooth Device [ 10.571440] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 10.571442] Bluetooth: BNEP filters: protocol multicast [ 10.571448] Bluetooth: BNEP socket layer initialized [ 630.835385] Bluetooth: RFCOMM TTY layer initialized [ 630.835393] Bluetooth: RFCOMM socket layer initialized [ 630.835398] Blu
[Touch-packages] [Bug 1886714] Re: [Broadcom BCM20702A0] Bluetooth disconnects, and then sound fails on reconnect
While waiting for a new Bluetooth dongle I messed around with some other equipment. It seems like I can't make a Herman/Kardon Onyx 4 to fail, which is a bit strange. Tried to log it with hcidump and nothing unusual showed up. Logging avdtp gave identical results. So just to double-check what happen when I attached my Sony headphones I started hcidump and connected the headphone, and started playing a streamed movie. I see the effect of the sound breaking up, but I can't make the connection fail when hcidump is running. Usually it is enough to provoke some glitches in the connection, then delay builds up, and the phone disconnects. When that happen all devices using sound over USB dies. With hcidump running is does not die. This is really weird, as hcidump should not change the stream in any way. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to bluez in Ubuntu. https://bugs.launchpad.net/bugs/1886714 Title: [Broadcom BCM20702A0] Bluetooth disconnects, and then sound fails on reconnect Status in bluez package in Ubuntu: New Status in linux package in Ubuntu: Confirmed Bug description: This bug has persisted over several years, and several versions, and after a lot of investigation I'm not really any closer on what's going on. I have two pretty old GA MA78gm S2H mainboards, configured slightly different, and otherwise working properly. Both of them have run both Ubuntu and Windows. The problem seems to have been minimized when running Win10, and even if it is there it seems like Win10 recover when it happen. I wonder if I started noticing the problem under Ubuntu 14.x, but I'm pretty sure it was there already at Ubuntu 16.x. I'm now running Ubuntu 19.10 and Gnome 3.34.2. (Just for the record, the bug also persisted in Ubu 18.04 for as long as I was using it.) It isn't really an option to switch the mainboards, as there are too much custom-builds running on them for the moment. They will probably be replaced when I have time to rebuild everything. ;) To make Bluetooth work I use an ASUS USB-BT400, which report as “BCM920702 Bluetooth 4.0”, or more accurately “BCM20702A1 (001.002.014) build 1467”. I have also used other dongles, but it seems like all of them has the same chipset. Now… Given I restart the computer And boot into Ubuntu 19.10 And log in as myself And attach a pair of Sony MDR-ZX770BN When I listen to sound from a movie with A2DP Then at some random point it start to lag noticeably (sound becomes scratchy) And suddenly disconnects (at this point it seems like it is Bluetooth that disconnects) It may take 5–10 minutes and up to several hours before it disconnects. Given I turn the headphones off And back on When it reconnects to the computer Then the computer fails to enable the sound device (visible in the preference manager f.ex.) There are several reports of various equipments that disconnect, and I wonder if this could be the same problem. Problem 1 The dongle is rather hot when it disconnects. This is mere speculation, but I wonder if the disconnect happen because either the mainboard gives to little current and thus it fails due to voltage drop, or it fails due to overheating. It seems like the port should have enough current to sustain the dongle, but I wonder if the mainboard could let several ports share the same power source, and thus it fail to deliver enough current. There are other devices powered by the USB ports, and they don't seem to fail, which seems likely to happen if power is the issue. The issue seems to be somewhat related to the quality of the audio, which makes me wonder whether higher quality gives more transferred data, which again gives higher power consumption. It also seems like the issue can be triggered by moving away from the computer. That would give higher tx power, which could make the dongle overheat or mainboard could fail to provide enough current. Is there any way to get a more specific failure report from the dongle? Problem 2 After the headphone reconnects it seems like the sound system isn't working properly. I've been checking, and everything seems correct, still the headphone is missing as an output device. I have not been able to figure out what makes the sound system fail, and I have not been able to make it recover. Only way to recover seems to be to do a cold reboot. A simple warm reboot does not fix the problem, but this can be related to problem 1. A few dumps john@hydra:~$ dmesg | fgrep 'Blue' [3.089584] usb 1-2.2: Product: BCM920702 Bluetooth 4.0 [8.417252] Bluetooth: Core ver 2.22 [8.417280] Bluetooth: HCI device and connection manager initialized [8.417284] Bluetooth: HCI socket layer initialized [8.417286] Bluetooth: L2CAP socket layer initialized [8.417301] Bluetooth: SCO socket layer
[Touch-packages] [Bug 1886714] Re: [Broadcom BCM20702A0] Bluetooth disconnects, and then sound fails on reconnect
** Summary changed: - Bluetooth disconnects, and then sound fails on reconnect + [Broadcom BCM20702A0] Bluetooth disconnects, and then sound fails on reconnect ** Also affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to bluez in Ubuntu. https://bugs.launchpad.net/bugs/1886714 Title: [Broadcom BCM20702A0] Bluetooth disconnects, and then sound fails on reconnect Status in bluez package in Ubuntu: New Status in linux package in Ubuntu: New Bug description: This bug has persisted over several years, and several versions, and after a lot of investigation I'm not really any closer on what's going on. I have two pretty old GA MA78gm S2H mainboards, configured slightly different, and otherwise working properly. Both of them have run both Ubuntu and Windows. The problem seems to have been minimized when running Win10, and even if it is there it seems like Win10 recover when it happen. I wonder if I started noticing the problem under Ubuntu 14.x, but I'm pretty sure it was there already at Ubuntu 16.x. I'm now running Ubuntu 19.10 and Gnome 3.34.2. (Just for the record, the bug also persisted in Ubu 18.04 for as long as I was using it.) It isn't really an option to switch the mainboards, as there are too much custom-builds running on them for the moment. They will probably be replaced when I have time to rebuild everything. ;) To make Bluetooth work I use an ASUS USB-BT400, which report as “BCM920702 Bluetooth 4.0”, or more accurately “BCM20702A1 (001.002.014) build 1467”. I have also used other dongles, but it seems like all of them has the same chipset. Now… Given I restart the computer And boot into Ubuntu 19.10 And log in as myself And attach a pair of Sony MDR-ZX770BN When I listen to sound from a movie with A2DP Then at some random point it start to lag noticeably (sound becomes scratchy) And suddenly disconnects (at this point it seems like it is Bluetooth that disconnects) It may take 5–10 minutes and up to several hours before it disconnects. Given I turn the headphones off And back on When it reconnects to the computer Then the computer fails to enable the sound device (visible in the preference manager f.ex.) There are several reports of various equipments that disconnect, and I wonder if this could be the same problem. Problem 1 The dongle is rather hot when it disconnects. This is mere speculation, but I wonder if the disconnect happen because either the mainboard gives to little current and thus it fails due to voltage drop, or it fails due to overheating. It seems like the port should have enough current to sustain the dongle, but I wonder if the mainboard could let several ports share the same power source, and thus it fail to deliver enough current. There are other devices powered by the USB ports, and they don't seem to fail, which seems likely to happen if power is the issue. The issue seems to be somewhat related to the quality of the audio, which makes me wonder whether higher quality gives more transferred data, which again gives higher power consumption. It also seems like the issue can be triggered by moving away from the computer. That would give higher tx power, which could make the dongle overheat or mainboard could fail to provide enough current. Is there any way to get a more specific failure report from the dongle? Problem 2 After the headphone reconnects it seems like the sound system isn't working properly. I've been checking, and everything seems correct, still the headphone is missing as an output device. I have not been able to figure out what makes the sound system fail, and I have not been able to make it recover. Only way to recover seems to be to do a cold reboot. A simple warm reboot does not fix the problem, but this can be related to problem 1. A few dumps john@hydra:~$ dmesg | fgrep 'Blue' [3.089584] usb 1-2.2: Product: BCM920702 Bluetooth 4.0 [8.417252] Bluetooth: Core ver 2.22 [8.417280] Bluetooth: HCI device and connection manager initialized [8.417284] Bluetooth: HCI socket layer initialized [8.417286] Bluetooth: L2CAP socket layer initialized [8.417301] Bluetooth: SCO socket layer initialized [8.779706] Bluetooth: hci0: BCM: chip id 63 [8.780703] Bluetooth: hci0: BCM: features 0x07 [8.796682] Bluetooth: hci0: hydra [8.800667] Bluetooth: hci0: BCM20702A1 (001.002.014) build 1467 [9.671568] Bluetooth: hci0: BCM20702A1 (001.002.014) build 1467 [9.687584] Bluetooth: hci0: Broadcom Bluetooth Device [ 10.571440] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 10.571442] Bluetooth: BNEP filters: protocol multicast [ 10.571448] Bluetooth: BNEP socket layer initialized [ 630.835385] Bluetooth: RFCOMM TTY la
