Minty wrote:
hello,
I've got a Sony TX1XP laptop running Kubuntu [1].
There are a couple of acpi things that I'd love to be improved on this
machine, so I'm offering to help out if I can - but I could use some
direction from someone who has a clue about acpi and it's workings.
I'm happy enough (although not that great at) kernel compiling if need
be. Fwiw, I know of two others running some linux variant on this
machine/hardware.
Main issue:
/proc/acpi/fan exists, but is empty.
Fan comes on for about 20 sec, off for 5 secs, repeat.
Regardless of cpu temp.
cpu temp is accurately reported, normally sitting at 61C, but I've
seen it go higher when the machine is under load. thermal_zone
reports passive cooling, but aside from reporting the temp, anything
that might be set is reported as "<setting not supported>". It
Passive/active cooling resets new trip point values exported by BIOS.
If this is not supported(nearly none machine does) override them
manually(see below).
appears that cpu throttling works via
/proc/acpi/processor/CPU0/throttling but this doesn't appear to alter
the behaviour of the fan.
Lower the passive trip point(s). You need to play arround a bit to
find your preferred performance/accoustic balance.
The kernel will lower cpufreq as soon as you reach passive temp.
As fans are mostly controlled by BIOS, this is a good and mostly only
solution to get your machine quiet.
Not sure whether kubuntu already includes powersave/kpowersave packages,
AFAIK they exist.
There you can define schemes and it will override the trip points
as defined (you still need to define them manually as a perfect value
needs a bit of watching the temps and listening to the fan activity
of a machine). You can switch the schemes as you wish then...
This makes only sense if your machine supports cpufreq! Throttling is bad
and makes your machine unusable slow.
(test -d /sys/devices/system/cpu/cpu0/cpufreq && echo "cpufreq supported").
You also can simply override the values by:
echo "CRITICAL:HOT:PASSIVE:ACTIVE[0]:ACTIVE[1]"
>/proc/acpi/thermal_zone/X/trip_points
You need to pass all five values, not defined values (do a cat before) will be
ignored. Be careful with the critical trip point value, you shouldn't use
another value than the one defined by BIOS!
Thomas
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