usb/77604: Sluggish Logitch LX700 USB Mouse

[Jonathan Fosburgh]

After looking through other bug reports I have added options USB_DEBUG to my 
kernel and set the debug level on my ums device to 11.  I don't know what the 
units are, but it does not appear that X or Y access motion is actually 
reflected by the pointer until approximately '5' whatevers have been 
accumulated.  That is I can gently nudge the mouse and watch debug info of 
the form:

Mar  8 10:44:42 jef-nt kernel: ums_intr: x:-2 y:2 z:0 t:0 buttons:0x0
Mar  8 10:44:42 jef-nt kernel: ums_intr: sc=0xc191b800 status=13
Mar  8 10:44:42 jef-nt kernel: ums_intr: data = 01 00 00 02 00 00
Mar  8 10:44:42 jef-nt kernel: ums_intr: status=13

scroll by, but the mouse does not move until the number next to x: or y: has 
reached approx. 5.  If I move the mouse slowly I get something approaching 
smooth movement, though it is still feeling a little sluggish.  Rapid motion 
might cause the numbers next to x: or y: to move by the tens:

Mar  8 10:44:42 jef-nt kernel: ums_intr: x:-85 y:101 z:0 t:0 buttons:0x0

and the mouse jumps across large portions of the screen. I haven't checked Z 
axis and buttons, but I would imagine I come across the same thing.  HTH.
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