The Qtronix keyboard has a built in PS/2 port for a mouse.

It however posts a bogus button up event once in a while. Whenever
we receive dx=dy=dz=buttons=0 we postpone adding it to the queue for
50msecs with a timeout. If in the meantime something else is posted
the event is ignored.

This avoids the problem Nik Sayer reported. He noticed that X windows
would drop and pick up a window once in a while.

Thanks, Nik, for supplying me with the keyboard to fix the problem!

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/dev/usb/usb_quirks.h b/sys/dev/usb/usb_quirks.h
index 6fea94e..d03f1a6 100644
--- a/sys/dev/usb/usb_quirks.h
+++ b/sys/dev/usb/usb_quirks.h
@@ -45,6 +45,7 @@ struct usbd_quirks {
 #define UQ_MS_REVZ	0x04	/* mouse has Z-axis reversed */
 #define UQ_NO_STRINGS	0x08	/* string descriptors are broken. */
 #define UQ_BAD_ADC	0x10	/* bad audio spec version number. */
+#define UQ_SPUR_BUT_UP	0x20	/* spurious mouse button up events */
 };
 
 extern struct usbd_quirks usbd_no_quirk;