[Debian-eeepc-devel] Bug#644445: cpufrequtils: Doesn't find the right kernel module on EeePC 701

Axel Beckert abe at debian.org
Tue Oct 4 18:10:33 UTC 2011

Package: cpufrequtils
Version: 007-2
Severity: minor
User: debian-eeepc-devel at lists.alioth.debian.org
Usertag: 701

By loading all possible cpufreq modules, cpufrequtils 007-1
"accidentially" loaded the right module for my EeePC 701, p4_clockmod.

Before that I wasn't even aware that I can change the CPU frequency of
my EeePC 701 so fine-grained, especially after remembering the 701
issues with SHE (see http://bugs.debian.org/559578).

After the upgrade to cpufrequtils 007-2 and a reboot, these neat
features were gone again. While trying to get cpu frequency scaling back
on my EeePC, I downgraded cpufrequtils to 007-1 and that helped. :-)

So please load p4_clockmod for the following CPU:

processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 13
model name	: Intel(R) Celeron(R) M processor          900MHz
stepping	: 8
cpu MHz		: 900.000
cache size	: 512 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 sep mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss tm pbe nx up bts
bogomips	: 1259.92
clflush size	: 64
cache_alignment	: 64
address sizes	: 32 bits physical, 32 bits virtual
power management:

(Before loading p4_clockmod and running "/etc/init.d/loadcpufreq start"
the "cpu MHz" is usually around 630 MHz which interestingly is no more
available in
112500 225000 337500 450000 562500 675000 787500 900000)

For myself I've worked around this issue by explicitly stating
FREQDRIVER=p4_clockmod in /etc/default/loadcpufreq.

-- System Information:
Debian Release: wheezy/sid
  APT prefers unstable
  APT policy: (990, 'unstable'), (900, 'testing'), (600, 'stable'), (400, 'oldstable'), (110, 'experimental')
Architecture: i386 (i686)

Kernel: Linux 3.1.0-rc7-686-pae (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages cpufrequtils depends on:
ii  debconf [debconf-2.0]  1.5.41 
ii  libc6                  2.13-21
ii  libcpufreq0            007-2  
ii  lsb-base               3.2-28 

cpufrequtils recommends no packages.

cpufrequtils suggests no packages.

-- debconf information:
  cpufrequtils/enable: true

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