Mark Heffernan wrote:
<symptoms of keyboard / mouse working only when plugged directly, not through
KVM switch, snipped>
> Has anyone else run into this problem before or have any suggestions
> about what to do about it?
>From the logs you have provided, the device is being claimed and recognised
correctly.
The most likely problem is that you are running some form of hotplugging
system, and the modules are not being loaded. One way to verify this is to
check what "cat /dev/input/mice" produces. If you get a no such device error
(or something like that), then you need to load the mouse driver module.
 
> I should also mention that if the kernel is compiled without
> USB support, the keyboard works through the switch just fine, but the
> mouse does not.  I presume (with my very limited knowledge of the
> USB subsytem) that in this case BIOS is handling all the USB stuff.
This is typical.

> Below is a copy of my /proc/bus/usb/devices file with the KVM switch
> plugged in.  Below that is a snippet of /var/log/messages which is
> written when the uhci.o module is loaded.  Btw, I have a PIII running on
> an ASUS CUV4X motherboard.

<snip>
> I:  If#= 0 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=01 Prot=01 Driver=hid
> E:  Ad=81(I) Atr=03(Int.) MxPS=   8 Ivl= 10ms
> I:  If#= 1 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=01 Prot=02 Driver=hid
> E:  Ad=82(I) Atr=03(Int.) MxPS=   8 Ivl= 10ms
This shows that the hid driver has claimed the two interfaces on your KVM
switch.
 
<snip>
> Oct 30 00:31:41 debian kernel: Manufacturer: ATEN
> Oct 30 00:31:41 debian kernel: Product: CS124U V1.00
> Oct 30 00:31:41 debian kernel: input0: USB HID v1.00 Keyboard [ATEN
> CS124U V1.00] on usb1:2.0
> Oct 30 00:31:41 debian kernel: input1: USB HID v1.00 Mouse [ATEN CS124U
> V1.00] on usb1:2.1
This is further evidence.

Brad

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