Acer 1304xc laptop & wrong max cpu frequency

Acer 1304xc laptop & wrong max cpu frequency

[Marijan Peh]

Acer 1304xc laptop
Slackware linux 10.0
Kernel 2.6.8-rc3-mm1

-- dmesg start --
CPU 0 irqstacks, hard=c0422000 soft=c0421000
PID hash table entries: 2048 (order 11: 16384 bytes)
Detected 1533.348 MHz processor.
CPU: AMD mobile AMD Athlon(tm) XP 1800+  stepping 00
powernow: PowerNOW! Technology present. Can scale: frequency and
voltage.
powernow: No PST tables match this cpuid (0x780)
powernow: This is indicative of a broken BIOS.
powernow: Trying ACPI perflib
powernow: Minimum speed 666 MHz. Maximum speed 1266 MHz.
-- dmesg end --

-- /sys/devices/system/cpu/cpu0/cpufreq/ --
mpeh:~% grep ".*" /sys/devices/system/cpu/cpu0/cpufreq/*
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq:1266673
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq:1266673
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq:666670
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies:1266673
1000005 933338 800004 666670 
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors:powersave
userspace performance 
/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq:1266673
/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver:powernow-k7
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor:userspace
/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq:1266673
/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq:666670
/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed:1266673
-- /sys/devices/system/cpu/cpu0/cpufreq/ --

-- /proc/cpuinfo --
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 8
model name      : mobile AMD Athlon(tm) XP 1800+ 
stepping        : 0
cpu MHz         : 1266.678
cache size      : 256 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca
cmov pat pse36 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow
bogomips        : 2510.66
-- /proc/cpuinfo --

Solution ?

-- 
http://nymos.dyndns.org/

Re: Acer 1304xc laptop & wrong max cpu frequency

[Dave Jones]

On Fri, Aug 06, 2004 at 07:33:33AM +0200, Marijan Peh wrote:

There are two sources of tables we can look for for information
on available frequencies. When one looks broken, we fall back to
the other.

 > powernow: PowerNOW! Technology present. Can scale: frequency and
 > voltage.
 > powernow: No PST tables match this cpuid (0x780)
 > powernow: This is indicative of a broken BIOS.

Your BIOS authors can't read specifications.

 > powernow: Trying ACPI perflib
 > powernow: Minimum speed 666 MHz. Maximum speed 1266 MHz.

Thankfully, they managed to get the ACPI tables right.

Looks fine.

		Dave