Hi, dear all As i recompiled 2.4.2-ac20 with ACPI support the system cannot switch itself off. With APM it work without any problem. I get a message "Couldn't switch to S5" if try to call reboot(2). At load it shows that the mode is supported. Alex Riesen P.S. Motheboard Asus CUV4X /proc/cpuinfo: processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 8 model name : Pentium III (Coppermine) stepping : 3 cpu MHz : 701.605 cache size : 256 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 3 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse bogomips : 1399.19 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/