Lars Erdmann updated the USB host controller drivers to version 10.203. (2016/04/26)
http://hobbes.nmsu.edu/h-search.php?key=usbdrv
changes in 10.203:
USBMOUSE.SYS, USBKBD.SYS:
1) fixed a problem with /V switch (even without /V, startup message would be shown on bootup)
USBMSD:
1) update OS2CDROM.DMD callback processing so that multiple USB CD-ROM devices can actually be handled
2) skip "GetMaxLUN" command for protocol type "BulkOnly" devices if their subclass is not also "SCSI"
("GetMaxLUN" hangs for many devices and will prevent device attachal)
3) successfully finish the device attach phase even if no media is inserted in the CD-ROM drive
(allows you to boot with CD-ROM drive attached but no media yet inserted)
4) implement "command queueing" (wait for issued command to finish before sending next) in order to prevent
erroneous device behaviour
5) reduce the number of occasions where a MSD reset is driven and prevent recursive MSD resets
USBEHCD.SYS:
1) increase timeouts for BIOS handover
USBEHCD.SYS, USBOHCD.SYS:
1) for /FS switch specified, power off all ports before host controller reset