On Saturday 14 July 2012 01:02:12 Norman Golisz wrote: > On Fri Jul 13 2012 23:58, frantisek holop wrote: > > hi there, > > > > how different is the code path between reboot(8), halt(8) > > and when i press the power button? > > > > the reason i ask is, that fairly often, reboot(8) and halt(8) > > "hangs" (X disappears, but there is only black screen, > > and the console never appears, no "syncing disks" message), > > but pressing the power button turns off the machine > > without fail every time. another one of those mysteries.. > > > > happened on multiple notebooks for me, but here is the dmesg > > for the one i use daily nowadays. > > I can confirm this happens on my Thinkpad T400, too. I did not yet dig > further into this, so I provide at least some system info; dmesg, > pcidump, Xorg.0.log. > > $ dmesg
I have seen this also. But not only when shutting down. Lately I start X from the command line and sometimes it indeed hangs when closing X, but it is no hard lock. Pressing ctrl-alt-backspace did the trick to continue the shutdown. Switching to an other console kept working. When I was using kdm and it happens, I sometimes started reboot in another console. But... I don't know if it did the trick. I do can remember that there were two shutdown process at work, so I think it did. I have to say that it was worse with the rtrheads transition, but lately I haven't seen it that often. But, this laptop almost never shuts down. I only restart kde when konqueror is giving trouble. But I suspect that something is choking on the X processes. I don't know all the technical details, but I would think that X first shuts down his processes and then calls the shutdown program. So shutdown wouldn't be involved with killing X processes. I can imagine that the power button uses something which act the same like "kill -KILL" and thus capable off killing X. hope this helps. gr Renzo ps I'm running a current build from 4-26-12
