On Tue, Jan 17, 2006 at 02:53:11PM -0500, Alan Stern wrote: > On Tue, 17 Jan 2006, Brian Stumm wrote: > > > Vojtech Pavlik wrote: > > > > > On Tue, Jan 17, 2006 at 10:32:12AM -0800, Brian Stumm wrote: > > > > > > > I assume thats the MxPS value from /proc/bus/usb/devices??? If so I > > > > think its 5 for > > > > mouse and 8 for keyboard. > > > > > > > > T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 3 Spd=1.5 MxCh= 0 > > > > D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 > > > > P: Vendor=060b ProdID=0541 Rev= 1.01 > > > > C:* #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr=100mA > > > > I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=01 Prot=01 Driver=usbhid > > > > E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=10ms > > > > I: If#= 1 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=usbhid > > > > E: Ad=82(I) Atr=03(Int.) MxPS= 5 Ivl=10ms > > > > > > Wow. I've never seen a maxpacketsize other than a power of two. That > > > seems like a bug in the device descriptor, that might cause problems > > > elsewhere in the stack. > > > > Snoopy/Windows reports the same (http://churchoftux.com/snoopy/ contains > > sniffer logs): > > Interface[0]: Pipes[0] : MaximumPacketSize = 0x0005 > > > > How might I further debug or where do I look to see how this strange packet > > size is > > affecting things? > > It's not affecting anything. (It works fine with 5-byte packets under > Windows, for instance.) If the device were to send back a packet > containing more than 5 bytes you'd be in trouble. As things stand, > however, it's not sending back anything at all. > > On the whole, it's hard to say which is worse... :-( "babble" IMO means it's sending more than what it has been asked for, resulting in the URB coming back with an error instead of data.
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