@Anton, I'm finding this one hard to understand, the ACPI tables in your
machine have the _PSS defined as:
Name (_PSS, Package (0x02)
{
Package (0x06)
{
0x000002BC, // 700 MHz
0x00007918,
0x0000000A,
0x0000000A,
0x00000728,
0x00000728
},
Package (0x06)
{
0x00000258, // 600 Mhz
0x0000332C,
0x0000000A,
0x0000000A,
0x0000061D,
0x0000061D
}
})
So this explains the earlier limit of 600 or 700 Mhz CPU frequency.
However, I don't understand why the 3.0.x kernel is now picking up
faster settings for _PSS. Are you comparing the machine when running
on AC or battery? Can you attach the ACPI tables to this bug now that
you have higher CPU frequencies so I can just sanity check this.
do:
sudo apt-get install acpidump
sudo acpidump > acpidump.log
Thanks
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https://bugs.launchpad.net/bugs/962947
Title:
CPU scaled back to very slow speed, cannot increase speed
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