erik.r...@rdsoftware.de wrote:
On 12/31/11 13:11, Erik Rull wrote:
Hi all,
how can I use a USB 1.1 device on the USB 2.0 bus? Currently the EHCI
implementation complains that the device is mismatches the USB version.
-readconfig docs/ich9-ehci-uhci.cfg
cheers,
Gerd
Thanks for the hint.
It looks better now. But some things are still a bit strange.
Sequence:
device_add usb-host,bus=ehci.0,hostbus=2,hostport=1.4
Plug in a USB 2.0 printer
(gets detected by the guest, printing is possible, no bluescreen, it just
works)
Remove the USB 2.0 printer
Plug in a USB 1.1 dongle
Gets detected, etc., fine
Remove the USB 1.1 dongle
Plug in the USB 2.0 printer again
Guest complains now, that a USB 2.0 device was plugged into a USB 1.1 port
=> printer is now 1.1 and does not work as if EHCI is missing now
=> reboot guest, everything is fine again??
Any idea what could have happened here?
Same behavior when using a 2.0 USB key and the USB 1.1 dongle - also on
other ports - the transfer rate is horrible after having removed the USB
1.1 device and reconnected the 2.0 device.
Exchanging the two USB 2.0 devices on the same port without having the 1.1
device plugged in is fine!
Any hint what is wrong here would be great.
Best regards,
Erik
Additional Information:
This behavior is present on a Linux guest as well! After having removed the
1.1 Dongle and plugged in the printer, the Linux guest detects the hardware
via the UHCI kernel drivers and tells me to use a faster hub for max.
performance.
It looks as if the speed downgrade by the 1.1 device cannot be reversed at
runtime.
Best regards,
Erik
