Am 07.07.2011 16:57, schrieb Daniele Guerrieri: >> ok :-) >> >>> From wikipedia (probably also in kernel/Documentation but now i'm on >>> a win machine) i've read: >> >> have you a link? >> i do not find this on wikipedia >> http://en.wikipedia.org/wiki/Sysrq > > here the link: http://en.wikipedia.org/wiki/Magic_SysRq_key :) > > this value is a "bitmask": > >> i think this is not enough for "ALT+PRINT+K" because sync >> is only for flushing disk-buffers, maybe i play around a > hm, you're right, i think that, since it's a bitmask we need to sum > the values we want: e.g. if we want > sync (16),debugging(8), signalling(64), we have to sum > -# value=8+16+64=88, which binary is: 01 01 10 00 > ---example:--------- > ______________ > 01: 00 00 00 01 | > 02: 00 00 00 10 | > 04: 00 00 01 00 | > 08: 00 00 10 00 | > 16: 00 01 00 00 | > 32: 00 10 00 00 | > 64: 01 00 00 00 | > ______________| > 01 01 10 00 > ------------------------- > So the magic number would be 88 :) this night i'll try it i came to first to 84, with 88 CTRL+PRINT+K says in dmesg not allowed with 84 * CTRL+PRINT+S (sync buffers to disk) works * CTRL+PRINT+K (kill session and back to login) works * but REISUB kills processes (named, openvpn, vmware...) * After REISUB the system would with 84 in a bader state as reboot finally i came to 20 * CTRL+PRINT+S (sync buffers to disk) works * CTRL+PRINT+K (kill session and back to login) works * CTRL+PRINT+REISUB does nothing bad th eonly strange gting is that ALT+F2 swicthes to terminal instead open the xecute-dialog of KDE and after switch back to KDE the dialog is still open - not sure what there happens but if this is only after SYSRQ call which is not often used i think we can live with that __________________ dmesg-output of REISUB: Jul 16 13:56:34 srv-rhsoft kernel: SysRq : Keyboard mode set to system default Jul 16 13:56:34 srv-rhsoft kernel: SysRq : This sysrq operation is disabled. Jul 16 13:56:35 srv-rhsoft kernel: SysRq : This sysrq operation is disabled. Jul 16 13:56:35 srv-rhsoft kernel: SysRq : Emergency Sync Jul 16 13:56:35 srv-rhsoft kernel: Emergency Sync complete Jul 16 13:56:36 srv-rhsoft kernel: SysRq : This sysrq operation is disabled. Jul 16 13:56:36 srv-rhsoft kernel: SysRq : This sysrq operation is disabled. ___________________ http://www.mjmwired.net/kernel/Documentation/sysrq.txt 2 - enable control of console logging level 4 - enable control of keyboard (SAK, unraw) 8 - enable debugging dumps of processes etc. 16 - enable sync command 32 - enable remount read-only 64 - enable signalling of processes (term, kill, oom-kill) 128 - allow reboot/poweroff 256 - allow nicing of all RT tasks
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