I've just noticed something with the last kernel update that I don't see with prior kernels: During the very early stages of writing text to the screen at boot time, there's a message like this: ACPI: Invalid PBLK length [5] I don't know if this is worth worrying about. Anybody care to comment? It's a P4S800MX motherboard, and I don't know if the following is pertinent: grep CPU dmesg Initializing CPU#0 CPU 0 irqstacks, hard=c075b000 soft=c075a000 CPU: After generic identify, caps: 3febfbff 00000000 00000000 00000000 00000000 00000000 00000000 CPU: After vendor identify, caps: 3febfbff 00000000 00000000 00000000 00000000 00000000 00000000 CPU: Trace cache: 12K uops, L1 D cache: 8K CPU: L2 cache: 256K CPU: After all inits, caps: 3febf3ff 00000000 00000000 00000080 00000000 00000000 00000000 Intel machine check reporting enabled on CPU#0. CPU0: Intel P4/Xeon Extended MCE MSRs (12) available CPU0: Thermal monitoring enabled CPU: Intel(R) Pentium(R) 4 CPU 1.60GHz stepping 02 cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 1 model name : Intel(R) Pentium(R) 4 CPU 1.60GHz stepping : 2 cpu MHz : 1600.124 cache size : 256 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tmbogomips : 3202.65 rpm -q kernel kernel-2.6.15-1.2054_FC5 (this is the one that shows this) kernel-2.6.17-1.2187_FC5 (no similar error) kernel-2.6.18-1.2200.fc5 (no similar error) On a side note. I'm told this P4 has hyperthreading, and I see the ht flag above. Should I be using the SMP kernel? I was somewhat surprised to see my BIOS offering clock speeds about two and three times faster than the label on CPU (as above, 1.6 GHz). The BIOS automatically deals with clock speed, and I never expected overclocking options THAT much faster. I've left it at the same speed as printed on the CPU. -- (Currently running FC4, but testing FC5, if that's important.) Don't send private replies to my address, the mailbox is ignored. I read messages from the public lists.