Dear listmembers,
recently I switched to a new pc, making use of an external USB sound device.
The problem: when I log off a kde-session and log in again, the sound device
vanishes. Issuing dmesg, I see:
****************************************************************************************************
[747766.894681] systemd-logind[22155]: New session 1337 of user hoss.
[747767.130779] checkproc[31777]: checkproc: can not get session id for
process 30437!
[747767.172502] nas[31781]: Network Audio System Release 1.9.2
[747768.192940] dbus-daemon[22185]: no kernel backlight interface found
[747768.967589] dbus-daemon[22185]: dbus[22185]: [system] Activating via
systemd: service name='org.freedesktop.NetworkManager' unit='dbus-
org.freedesktop.NetworkManager.service'
[747768.967791] dbus[22185]: [system] Activation via systemd failed for unit
'dbus-org.freedesktop.NetworkManager.service': Unit dbus-
org.freedesktop.NetworkManager.service failed to load: No such file or
directory. See system logs and 'systemctl status dbus-
org.freedesktop.NetworkManager.service' for details.
[747768.967812] dbus-daemon[22185]: dbus[22185]: [system] Activation via
systemd failed for unit 'dbus-org.freedesktop.NetworkManager.service': Unit
dbus-org.freedesktop.NetworkManager.service failed to load: No such file or
directory. See system logs and 'systemctl status dbus-
org.freedesktop.NetworkManager.service' for details.
[747773.392964] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with
disabled ep ffff8803cf791240
[747773.392966] xhci_hcd 0000:00:14.0: Trying to add endpoint 0x3 without
dropping it.
[747773.392969] usb 3-4: Not enough bandwidth for altsetting 1
[747773.392971] ALSA pcm.c:250 9:3:1: usb_set_interface failed
[747773.394882] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with
disabled ep ffff8803cf791240
[747773.394885] xhci_hcd 0000:00:14.0: Trying to add endpoint 0x3 without
dropping it.
[747773.394887] usb 3-4: Not enough bandwidth for altsetting 1
[747773.394889] ALSA pcm.c:250 9:3:1: usb_set_interface failed
[747773.419558] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with
disabled ep ffff8803cf791240
[747773.419561] xhci_hcd 0000:00:14.0: Trying to add endpoint 0x3 without
dropping it.
[747773.419563] usb 3-4: Not enough bandwidth for altsetting 1
[747773.419565] ALSA pcm.c:250 9:3:1: usb_set_interface failed
[747773.449987] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with
disabled ep ffff8803cf791240
[747773.449989] xhci_hcd 0000:00:14.0: Trying to add endpoint 0x3 without
dropping it.
[747773.449992] usb 3-4: Not enough bandwidth for altsetting 2
[747773.449995] ALSA pcm.c:250 9:3:2: usb_set_interface failed
****************************************************************************************************
I think the dbus-manager messages can savely be ignored, they are not related
to this problem IMHO. In contrast, xhci_hcd seems to be the culprit but I
cannot tell anything more about it.
After this, I have to plug-unplug the device, then I can use it again - until
the next logout, what is very anoying. By the way, I am using kernel 3.4.4.
Thank you very much for looking into this,
take care
Dieter Jurzitza
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