On 07/08/2012 08:50 PM, Dr. Ing. Dieter Jurzitza wrote:
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
I have got a basic idea about what's going on...
When you logoff, the driver will change interface. xHCI driver will drop
the endpoints of the old interface and add the endpoints of new
interface. However the drop endpoint is disabled and xHCI driver ignores
the drop request, while in add endpoint request driver finds out the
endpoint is not dropped and hence the add request fails.
Anyway, please try the patch attached to see if it helps.
Thanks,
Andiry
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 73e8817..220671a 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1448,7 +1448,7 @@ int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
xhci_get_endpoint_flag(&ep->desc)) {
xhci_warn(xhci, "xHCI %s called with disabled ep %p\n",
__func__, ep);
- return 0;
+// return 0;
}
ctrl_ctx->drop_flags |= cpu_to_le32(drop_flag);
