This is taken from 2.6.21.2 can be the fix for our problems?
commit ca5cf888be6e9261cdcf0b0de30c7237aa87f366
Author: Daniel Drake <[EMAIL PROTECTED]>
Date: Tue May 15 19:59:03 2007 +0000
[PATCH] CPUFREQ: powernow-k7: fix MHz rounding issue with perflib
When the PST tables are broken, powernow-k7 uses ACPI's processor_perflib to
deduce the available frequency multipliers from the _PSS tables.
Upon frequency change, processor_perflib performs some verification on the
frequency (checks that it's within allowable bounds).
powernow-k7 deals with absolute frequencies in KHz, whereas perflib only
deals with MHz values. When performing the above verification, perflib
multiplies the MHz values by 1000 to obtain the KHz value.
We then end up with situations like the following:
- powernow-k7 multiplies the multiplier by the FSB, and obtains a value
such as 1266768 KHz
- perflib belives the same state has frequency of 1266 MHz
- acpi_processor_ppc_notifier calls cpufreq_verify_within_limits to verify
that 1266768 is in the allowable range of 0 to 1266000 (i.e. 1266 * 1000)
- it's not, so that frequency is rejected
- the maximum CPU frequency is not reachable
This patch solves the problem by rounding up the MHz values stored in
perflib's
tables. Additionally it corrects a broken URL.
It also fixes http://bugzilla.kernel.org/show_bug.cgi?id=8255 although this
case is a bit different: the frequencies in the _PSS tables are wildly
wrong,
but we get better results if we force ACPI to respect the fsb * multiplier
calculations (even though it seems that the multiplier values aren't
entirely
correct either).
Signed-off-by: Daniel Drake <[EMAIL PROTECTED]>
Signed-off-by: Dave Jones <[EMAIL PROTECTED]>
Signed-off-by: Chris Wright <[EMAIL PROTECTED]>
--
/proc/cpuinfo reports wrong frequeny for AMD Athlon XP 3000+
https://bugs.launchpad.net/bugs/71772
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