Public bug reported:
Binary package hint: linux-image-2.6.20-16-generic
Power saving seems not to work on HP Compaq 6715s RU658EA. This laptop
has Turion TL-58 on chipset ATI M690T. Frequency scaling works fine, but
even when running on the lowest frequency and in idle load, fan turns
too often up. I looked into /proc/acpi/processor/C000 and found out
this:
# uname -a
Linux lomilomi 2.6.20-16-generic #2 SMP Thu Jun 7 19:00:28 UTC 2007 x86_64
GNU/Linux
# cat /proc/acpi/processor/C000/info
processor id: 0
acpi id: 1
bus mastering control: yes
power management: no
throttling control: yes
limit interface: yes
# cat /proc/acpi/processor/C000/limit
active limit: P0:T0
user limit: P0:T0
thermal limit: P0:T0
# cat /proc/acpi/processor/C000/power
active state: C1
max_cstate: C8
bus master activity: 00000000
maximum allowed latency: 8000 usec
states:
*C1: type[C1] promotion[--] demotion[--] latency[000]
usage[00000000] duration[00000000000000000000]
(and the same values for second core). This bug (probably lack of
undervolting) is very inconvenient for laptop users, because it makes
battery life much shorter...
** Affects: linux-source-2.6.20 (Ubuntu)
Importance: Undecided
Status: New
** Tags: acpi power power-saving
--
Turion TL-58 doesn't seem to use p-states
https://bugs.launchpad.net/bugs/133559
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