USB errors after unplugging Wacom tablet
|Reported by:||idefix||Owned by:||mmlr|
When I unplug my Wacom Graphire 2 tablet, a lot of USB errors are showing up in the serial log, like:
usb error uhci 0: td (0x0243e4c0) error: status: 0x254507ff; token: 0x00e88769;
The strange thing is that the amount of errors (after the
wacom: interrupt transfer - failure: -2147442668 line) is related to the duration the tablet was connected to the computer:
- 4 lines when the tablet was connected for 2 seconds.
- 11 lines when the tablet was connected for 5 seconds.
- 20 lines when the tablet was connected for 10 seconds.
But when the pen is always in proximity of the tablet when connected to the computer, the amount of errors is:
Compare that to the amount of errors when the pen wasn't in proximity:
Because the computer is logging to the serial port, this temporarily results in an unresponsive system when disconnecting the tablet. When serial debugging is disabled, the system stays responsive but the CPU usage is 100% for several seconds (especially when the tablet has been connected to the computer for several hours).
Tested in Haiku R1/alpha1 on real hardware (PII@400MHz, 384 MB, Intel 440BX).