Greetings, I encountered a problem on my ASUS 625 laptop: after I unplug AC cable, in about 1-2 minutes cpu0 frequencies are lowered to 800 MHz (usually, it sometimes shortly rises to 1.5GHz). Maximum frequency is 2.1 GHz. I uninstalled all frequency-controlling daemons and programs, but this behaviour persists. After watching /sys/devices/system/cpu/cpu0/ files, I saw that scaling_max_freq is lowered to 840000 at this time. When I edit this file, the value is immediately reversed. Unfortunately my BIOS has no freq scaling options whatsoever, so I cannot turn it off to test, but I'd rather have no scaling at all than work at 1/3 power. I tried adding processor.ignore_ppc=1 to boot command line, but this resulted in nothing. bios_limit value is, as expected, 2100000. Which logs could be useful? I include excerpts from kernel.log which seem relevant Jan 6 14:46:46 localhost kernel: [ 0.000000] Initializing cgroup subsys cpuset Jan 6 14:46:46 localhost kernel: [ 0.000000] Initializing cgroup subsys cpu Jan 6 14:46:46 localhost kernel: [ 0.000000] Linux version 3.1.6-1-ARCH (tobias@T-POWA-LX) (gcc version 4.6.2 20111125 (prerelease) (GCC) ) #1 SMP PREEMPT Thu Dec 22 08:52:33 UTC 2011 Jan 6 14:46:46 localhost kernel: [ 0.000000] Notice: NX (Execute Disable) protection cannot be enabled: non-PAE kernel! Jan 6 14:46:46 localhost kernel: [ 0.000000] DMI 2.6 present. Jan 6 14:46:46 localhost kernel: [ 0.000000] DMI: Hewlett-Packard HP 625/1475, BIOS 68DVA Ver. F.01 05/24/2010 Jan 6 14:46:46 localhost kernel: [ 0.003727] CPU: Physical Processor ID: 0 Jan 6 14:46:46 localhost kernel: [ 0.003730] CPU: Processor Core ID: 0 Jan 6 14:46:46 localhost kernel: [ 0.003734] mce: CPU supports 6 MCE banks Jan 6 14:46:46 localhost kernel: [ 0.003743] using AMD E400 aware idle routine Jan 6 14:46:46 localhost kernel: [ 0.004601] ACPI: Core revision 20110623 Jan 6 14:46:46 localhost kernel: [ 0.013344] ftrace: allocating 15589 entries in 31 pages Jan 6 14:46:46 localhost kernel: [ 0.016734] Enabling APIC mode: Flat. Using 1 I/O APICs Jan 6 14:46:46 localhost kernel: [ 0.017029] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1 Jan 6 14:46:46 localhost kernel: [ 0.052918] CPU0: AMD Athlon(tm) II P320 Dual-Core Processor stepping 03 Jan 6 14:46:46 localhost kernel: [ 0.053330] Performance Events: AMD PMU driver. Jan 6 14:46:46 localhost kernel: [ 0.053330] ... version: 0 Jan 6 14:46:46 localhost kernel: [ 0.053330] ... bit width: 48 Jan 6 14:46:46 localhost kernel: [ 0.053330] ... generic registers: 4 Jan 6 14:46:46 localhost kernel: [ 0.053330] ... value mask: 0000ffffffffffff Jan 6 14:46:46 localhost kernel: [ 0.053330] ... max period: 00007fffffffffff Jan 6 14:46:46 localhost kernel: [ 0.053330] ... fixed-purpose events: 0 Jan 6 14:46:46 localhost kernel: [ 0.053330] ... event mask: 000000000000000f Jan 6 14:46:46 localhost kernel: [ 0.053330] System has AMD C1E enabled Jan 6 14:46:46 localhost kernel: [ 0.053330] Switch to broadcast mode on CPU0 -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
