"Correcting" myself: /var/log/Xorg.0.log doesn't show any error but somewhere during X startup "something" send next output to stdout (that in my particular system was redirected to a bloated log file): <div style="margin-left: 40px;">... 1130 expected keysym, got XF86TouchpadToggle: line 122 of inet 1131 expected keysym, got XF86TouchpadToggle: line 122 of inet 1132 The XKEYBOARD keymap compiler (xkbcomp) reports: 1133 > Warning: Type "ONE_LEVEL" has 1 levels, but <RALT> has 2 symbols 1134 > Ignoring extra symbols 1135 Errors from xkbcomp are not fatal to the X server 1136 expected keysym, got XF86TouchpadToggle: line 122 of inet 1137 The XKEYBOARD keymap compiler (xkbcomp) reports: 1138 > Warning: Type "ONE_LEVEL" has 1 levels, but <RALT> has 2 symbols 1139 > Ignoring extra symbols 1140 Errors from xkbcomp are not fatal to the X server 1141 expected keysym, got XF86TouchpadToggle: line 122 of inet 1142 The XKEYBOARD keymap compiler (xkbcomp) reports: 1143 > Warning: Type "ONE_LEVEL" has 1 levels, but <RALT> has 2 symbols 1144 > Ignoring extra symbols 1145 Errors from xkbcomp are not fatal to the X server 1146 expected keysym, got XF86TouchpadToggle: line 122 of inet 1147 The XKEYBOARD keymap compiler (xkbcomp) reports: 1148 > Warning: Type "ONE_LEVEL" has 1 levels, but <RALT> has 2 symbols 1149 > Ignoring extra symbols 1150 Errors from xkbcomp are not fatal to the X server 1151 expected keysym, got XF86TouchpadToggle: line 122 of inet 1152 The XKEYBOARD keymap compiler (xkbcomp) reports: 1153 > Warning: Type "ONE_LEVEL" has 1 levels, but <RALT> has 2 symbols 1154 > Ignoring extra symbols 1155 Errors from xkbcomp are not fatal to the X server ... </div> Still I don't known if that really has anything to do with the infinte random loop I observe. Regards, Enrique <div class="gmail_quote"> On Wed, Dec 1, 2010 at 8:55 PM, ENRIQUE ARIZON BENITO <<a href="mailto:enrique.arizonbenito@gmail.com">enrique.arizonbenito@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> Hi, I checked in Xorg.O.log and dmesg but no luck at this moment. I will try the hard way debugging the X server. Thanks for the link! Enrique<div><div></div><div class="h5"> <div class="gmail_quote">On Wed, Dec 1, 2010 at 12:54 PM, Pat Kane <<a href="mailto:pekane52@gmail.com" target="_blank">pekane52@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">On Wed, Dec 1, 2010 at 2:11 AM, ENRIQUE ARIZON BENITO <<a href="mailto:enrique.arizonbenito@gmail.com" target="_blank">enrique.arizonbenito@gmail.com</a>> wrote: <div> >>I was trying to use xbindkeys to control the power on/off a monitor through an wireless keyboard. >> >>Such remote keyboard has a peculiarity: >>It emits short pulses of infrared signals to the USB base. Each long keypress in the keyboard is transmited as a row of about 20 pairs >>per second of keypress/keyrelease events. >> >>Through xbindkeys I associate a given key code to the script that will actually switch on/off the monitor. >> >>First tests worked fine, but the problem comes when I press for a long time (maybe two or three seconds) a key. Then X randomly start >>an infinite loop an I have no other option that killing and restarting the X system. >> >>I'm really interested in fixing the problem source since this is the last piece in a puzzle to finish my project, but I don't known exactly >>where to look at. >> >>I would appreciate any help or hint or link to start tracing in the X source files to find a solution >>Regards, </div></blockquote>>Are there any error/warning msgs in your "/var/log/Xorg.0.log" file? >Also take a look at the output of the command "dmesg". >This is a nice web page > <a href="http://www.x.org/wiki/Development/Documentation/ServerDebugging" target="_blank">http://www.x.org/wiki/Development/Documentation/ServerDebugging</a> > > >Pat >--- </div> </div></div></blockquote></div>