Arch Linux

ri

Member

Registered: 2008-10-09

Posts: 73

Some power saving feature doensnt load on boot, but after suspend.

As topic said; some of my power saving feature doesnt load until I suspend and wake up my laptop. I first noticed this with my wlan led was lit constantly until i suspend. When looking at powertop before/after I found nothing changed when it comes to the wireless adapter but I saw that before suspending "Audio codec hwC0D3: Intel" was on 100% but after on 0%. Other power featueres like brightness and cpu scaling is working just fine and its all handled by laptop-mode-tools.

Im using testing repo but downgrading to core kernel doesnt help and laptop mode tools is not in testing.

Some info:

richard [~] :  pacman -Q kernel26 laptop-mode-tools
kernel26 2.6.39-1
laptop-mode-tools 1.57-3

Powertop resport before and after

Laptop mode tools configs:

#Generic wireless power saving mode settings
DEBUG=0
CONTROL_WIRELESS_POWER_SAVING="1"
WIRELESS_AC_POWER_SAVING=0
WIRELESS_BATT_POWER_SAVING=1

 # Intel HDA power saving settings
DEBUG=0
CONTROL_INTEL_HDA_POWER="1"
BATT_INTEL_HDA_POWERSAVE=1
LM_AC_INTEL_HDA_POWERSAVE=0
NOLM_AC_INTEL_HDA_POWERSAVE=0
INTEL_HDA_DEVICE_TIMEOUT=10
INTEL_HDA_DEVICE_CONTROLLER=1

I didnt found any interesting stuff in my logs either but I didnt really know what to look after and where. Realizing now that eneable debug mode on laptop mode tools probably is the next step. If I find any interesting I'll come back with and update.

Thanks
Richard

rwd

Member

Registered: 2009-02-08

Posts: 664

Re: Some power saving feature doensnt load on boot, but after suspend.

Try my syslog checker script to search for error messages:
https://bbs.archlinux.org/viewtopic.php … 37#p773737