Well, I have seriously mistaken in my first message.
The problem is not related to the video adapter. The correlation with
connection of USB devices was also incorrectly interpreted.
When I connected the second device I simply used one of USB 3.0 jacks.
When I run into troubles when connecting single USB devices - it was also when
I randomly used one of two USB 3.0 jacks...
Now I have both mentioned in the first message USB devices plugged into USB 2.0
jack and into the SATA/USB 2.0 combo jack and everything works perfectly!
When I connect the USB GPRS/UMTS modem to the USB jack after system is booted
correctly, I get first in /var/log/messages:
Oct 30 20:27:43 WZLap kernel: [ 603.363412] usb 2-1: new high speed USB device
number 2 using xhci_hcd
Oct 30 20:27:43 WZLap kernel: [ 603.382254] xhci_hcd 0000:03:00.0: WARN: short
transfer on control ep
Oct 30 20:27:43 WZLap kernel: [ 603.382752] xhci_hcd 0000:03:00.0: WARN: short
transfer on control ep
Oct 30 20:27:43 WZLap kernel: [ 603.383236] xhci_hcd 0000:03:00.0: WARN: short
transfer on control ep
Oct 30 20:27:43 WZLap kernel: [ 603.383378] usb 2-1: New USB device found, idVe
ndor=12d1, idProduct=1446
and then a lot of messages:
Oct 30 20:27:48 WZLap kernel: [ 609.270026] xhci_hcd 0000:03:00.0: WARN:
Stalled endpoint
Oct 30 20:27:48 WZLap kernel: [ 609.274685] xhci_hcd 0000:03:00.0: WARN:
Stalled endpoint
Oct 30 20:27:48 WZLap kernel: [ 609.281701] xhci_hcd 0000:03:00.0: WARN:
Stalled endpoint
Oct 30 20:27:48 WZLap kernel: [ 609.285046] xhci_hcd 0000:03:00.0: WARN:
Stalled endpoint
Even though the device seems to work correctly.
Probably I need to try to blacklist the USB 3.0 module...
--
Regards, WZab
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