[Bug 8720] still problems with k7 mobile frequency is lower than real

[bugme-daemon@bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=8720


dsd@gentoo.org changed:

           What    |Removed                     |Added
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                 CC|                            |davej@codemonkey.org.uk




------- Comment #19 from dsd@gentoo.org  2007-09-01 08:21 -------
Looking at dmesg in comment #15 and corresponding DSDT in comment #16:

powernow tables in this system are unusable so it falls back on ACPI. The
powernow_acpi_control_t values in the control field of the _PSS entries always
result in FID=0 VID=0 which looks wrong.

As there is _PCT, acpi-cpufreq may be a better cpufreq driver choice for this
system. However the ACPI-supplied cpu frequencies in _PSS are wrong.

The DSL code for _PSS reads FID and VID values from system memory (region FSEG
defined at 0x000FDF00 in system memory), and uses them as indexes into a local
PS13 array which presumably contains a series of frequencies. However, again
the FID values are always 0 so it always ends up looking at the first element,
0x5b7 (1463).

I'm not 100% sure if 0x000FDF00 is controlled by Linux or otherwise, however I
am fairly sure the answer here is that your BIOS is double-broken. Dave, any
comments?


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