<div dir="ltr">I can only provide more verbose info from Xorg.0.log and dmesg According to log error is caused by Error in I830WaitLpRing(), timeout for 2 seconds I need another laptop to debug it with gdb, when I do attach <pid> and switch to X can't go back and screen is black. <div class="gmail_quote">2008/7/24 Alan Hourihane <<a href="mailto:alanh@fairlite.co.uk" target="_blank">alanh@fairlite.co.uk</a>>: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Sounds like you are running in indirect GLX mode and there's a bug in the driver so the Xserver will crash. If you stop xdm (or equivalent) then Xorg will stop respawning and you should be able to get a backtrace in gdb, or via a core dump. But going back to the first point, it'd be easier to check why you are running in indirect mode first and fix that, it'd be easier to debug the driver then. </blockquote></div> </div>