In case you hadn't noticed already, there was a CVS change which claims to fix this.
http://cvsweb.xfree86.org/cvsweb/xc/programs/Xserver/xkb/ddxBeep.c.diff?r1=3.8&r2=3.9 -- - mdz -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
