I believe I have discovered a bug with linux-usb when using my Belkin
KVM. If I boot into linux just using the hid driver, the mouse fails to
work, but the keyboard works:
Boot Case 1 - hid: loaded, usbkbd: not loaded, usbmouse: not loaded
keyboard: works, mouse: doesn't work
/proc/bus/usb/devices (relevant section):
T: Bus=02 Lev=01 Prnt=01 Port=02 Cnt=01 Dev#= 2 Spd=1.5 MxCh= 0
D: Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=050d ProdID=0108 Rev= 1.12
S: Manufacturer=Belkin Components
S: Product=KVM USB Keyboard/Mouse
C:* #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr= 50mA
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=16ms
I: If#= 1 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=02 Driver=(none)
E: Ad=82(I) Atr=03(Int.) MxPS= 7 Ivl=8ms
If I boot with usbmouse and usbkbd, only the keyboard works:
Boot Case 2 - hid: not loaded, usbkbd: loaded, usbmouse: loaded
keyboard: works, mouse: doesn't work
/proc/bus/usb/devices (relevant section):
T: Bus=02 Lev=01 Prnt=01 Port=02 Cnt=01 Dev#= 4 Spd=1.5 MxCh= 0
D: Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=050d ProdID=0108 Rev= 1.12
S: Manufacturer=Belkin Components
S: Product=KVM USB Keyboard/Mouse
C:* #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr= 50mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=01 Driver=usbkbd
E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=16ms
I: If#= 1 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=02 Driver=usbmouse
E: Ad=82(I) Atr=03(Int.) MxPS= 7 Ivl=8ms
If I boot into linux using the usbkbd and hid modules, both devices
work!!:
Boot Case 3 - hid: loaded, usbkbd: loaded, usbmouse: not loaded
keyboard: works, mouse: works
/proc/bus/usb/devices (relevant section):
T: Bus=02 Lev=01 Prnt=01 Port=02 Cnt=01 Dev#= 2 Spd=1.5 MxCh= 0
D: Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=050d ProdID=0108 Rev= 1.12
S: Manufacturer=Belkin Components
S: Product=KVM USB Keyboard/Mouse
C:* #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr= 50mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=01 Driver=usbkbd
E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=16ms
I: If#= 1 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=02 Driver=hid
E: Ad=82(I) Atr=03(Int.) MxPS= 7 Ivl=8ms
Now, if I rmmod usbkbd after booting into case 3, both devices work:
T: Bus=02 Lev=01 Prnt=01 Port=02 Cnt=01 Dev#= 2 Spd=1.5 MxCh= 0
D: Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1
P: Vendor=050d ProdID=0108 Rev= 1.12
C:* #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr= 50mA
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=16ms
I: If#= 1 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=02 Driver=hid
E: Ad=82(I) Atr=03(Int.) MxPS= 7 Ivl=8ms
--Jeremy
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