[BRLTTY] Kernel 2.6.21 USB issues

[Jason White]

For others who are having this problem, try the following if you're
comfortable compiling a kernel.

In the make menuconfig menu, find the "USB selective suspend/resume and
wakeup" option, which is in the USB sub-menu of the "devices" menu, and turn
it off. For anyone looking at kernel config files, this is the
CONFIG_USB_SUSPEND
option.

Compile the kernel, install it, reboot, and if your situation is like mine,
the problem should go away.

Note that kernel 2.6.20 introduced a USB autosuspend feature which may be the
cause:
http://lwn.net/Articles/192310/