Re: Modify Thermal trip points, modern kernel acpi /sys/class/thermal/thermal_zone0/
On 05/31/2012 12:48 AM, Camaleón wrote:
On Wed, 30 May 2012 13:37:35 +0800, Bob wrote:
Hi on my laptop (ASUS EeePC 1215b) an AMD E-450 based system the current
open source drivers in Wheezy don't manage power very well so the system
overheats& the battery doesn't last long. [0]
You mean the heat problematic comes exclusively from the GPU? :-?
No it's just that the current open source drivers don't do power saving
very well with newer hardware, it'll come good but for the moment fglrx
is the way to go, if you google something like
linux radeon "open source" overheat laptop
you see it's not a new issue.
I would also check that cpufreqd is propelry loaded and set with a low
power consuming profile. Also, if your netbook has an option to switch to
a lower VGA mode it can be also something worth to try.
It is on Ondemand and happily idles at 800 MHz jumping to 1.65 GHz when
the demand is there, I could lower the display resolution but my desktop
runs at 3840 x 1200 and the netbook in question is 1366x768 which
already feels tight on the elbows, not sure I want to go any lower.
I've got squeeze running quite nicely with kernel, fglrx& their
dependencies coming from backports, but even then if you tax both cores
the CPU temperature climes quite quickly.
Mmm... is also hot with ATI closed-source driver?
Not as badly and only when the CPU or CPU & GPU are really taxed.
What I'd like to do is lower the temperature at which active cooling
starts
Changing that values manually can be a risk as this is usually set by the
BIOS or the VGA card.
Yes but it maybe the only option, see below
Those "thermal" trip point values seems to be wrong (passive should be
reached before critical, that is, when the computer is at a lower
temperature).
Install and configure "sensors" (or another power-management tool for eeepc)
and see what it says, to compare both results.
Ok
root@USBHDebian:~# sensors
acpitz-virtual-0
Adapter: Virtual device
temp1: +55.0°C (crit = +95.0°C)
k10temp-pci-00c3
Adapter: PCI adapter
temp1: +55.4°C (high = +70.0°C)
radeon-pci-0008
Adapter: PCI adapter
temp1: +55.0°C
root@USBHDebian:~# acpi -V
Battery 0: Discharging, 77%, 05:46:05 remaining
Battery 0: design capacity 5200 mAh, last full capacity 5107 mAh = 98%
Adapter 0: off-line
Thermal 0: ok, 55.0 degrees C
Thermal 0: trip point 0 switches to mode critical at temperature 95.0 degrees C
Thermal 0: trip point 1 switches to mode passive at temperature 120.0 degrees C
Cooling 0: LCD 5 of 10
Cooling 1: Processor 0 of 10
Cooling 2: Processor 0 of 10
So they aggree on the actual temperature and the critical temp, there is
no BIOS page where I can see the temps so I can't verify that way.
is "mode critical" the temperature above which the fan starts or at
which the system shuts down?
"Trip point" (as its name suggests) indicates a state when an event is
reached and action takes place, so I'm more inclined for the former.
Also shouldn't "mode passive" be around 50 assuming it's the temperature
below which the fan turns off to rely on passive cooling?
Yup, I also noticed that. It seems wrong.
How do I modify these numbers now the /proc/acpi thermal stuff is
deprecated?
I wouldn't tweak these values manually. Maybe you can install a tool that
make your fan to be always "on" but a hot computer usually means something is
wrong: either you have not loaded the proper modules to control power
management or there's a bug in some place (drivers, BIOS...).
Sadly I don't think fan controls are exposed in this chip-set
root@USBHDebian:~# grep FAN /var/log/dmesg
root@USBHDebian:~# grep fan /var/log/dmesg
[ 7.276594] [drm] Internal thermal controller without fan control
Can you think of another way of getting the fan to kick in at lower
temperatures?
Thanks for the help, sorry for the delay, my wife is using the NetBook
(under windows) for her work while her MacBook is getting repaired so I
have limited access.
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