Ubuntu
laptop-mode-tools package

power management not enabled with iwlagn module

Bug #508938 reported by Sergio Cambra
22
This bug affects 4 people
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laptop-mode-tools (Ubuntu)
New
Undecided
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Bug Description

Binary package hint: laptop-mode-tools

I have a Network controller: Intel Corporation WiFi Link 100 Series [8086:0083], and I enabled power saving with laptop-mode-tools (CONTROL_IWL_POWER=1) but it doesn't work because interface is not detected (there is no /sys/class/net/wlan0/wireless file). I tried with /usr/share/laptop-mode-tools/modules/wireless-iwl-power from lucid, because it fixes that bug, but it doesn't work too because it tries to write in /sys/class/net/wlan0/device/power_level but it doesn't exist.

I installed linux-backports-modules-wireless-karmic-generic package, and I can enable power management with "iwconfig wlan0 power on". Changing "echo $IWL_AC_POWER > /sys/class/net/$IF/device/power_level" with "$IWCONFIG $IF power off" and "echo $IWL_BATT_POWER > /sys/class/net/$IF/device/power_level" with "$IWCONFIG $IF power on" fixes it.

Tags: patch
Revision history for this message
Sergio Cambra (sergio-ensanjose) wrote :
Revision history for this message
Ritesh Raj Sarraf (rrs) wrote : Re: [Bug 508938] [NEW] power management not enabled with iwlagn module

Hi Sergio,

On Monday 18 Jan 2010 04:49:43 you wrote:
> I have a Network controller: Intel Corporation WiFi Link 100 Series
> [8086:0083], and I enabled power saving with laptop-mode-tools
> (CONTROL_IWL_POWER=1) but it doesn't work because interface is not
> detected (there is no /sys/class/net/wlan0/wireless file). I tried with
> /usr/share/laptop-mode-tools/modules/wireless-iwl-power from lucid,
> because it fixes that bug, but it doesn't work too because it tries to
> write in /sys/class/net/wlan0/device/power_level but it doesn't exist.
>

Thanks. Looks like I had missed to add the trigger using the commands, for
this module. I will fix this soon upstream.

Regards,
Ritesh
--
Ritesh Raj Sarraf
RESEARCHUT - http://www.researchut.com
"Necessity is the mother of invention."

Revision history for this message
Ritesh Raj Sarraf (rrs) wrote :

On Monday 18 Jan 2010 10:46:01 Ritesh Raj Sarraf wrote:
> Thanks. Looks like I had missed to add the trigger using the commands, for
> this module. I will fix this soon upstream.
>

Sergio, I have fixed this problem in my branch. Would you be interested in
testing it ?

PS: Keep in my that Ubuntu's invocation of laptop-mode-tools is different than
what upstream does.

Regards,
Ritesh
--
Ritesh Raj Sarraf
RESEARCHUT - http://www.researchut.com
"Necessity is the mother of invention."

Revision history for this message
Sergio Cambra (sergio-ensanjose) wrote :

What must I do to test it?

Revision history for this message
eval- (eval-) wrote :

I can confirm on Karmic 9.10 (laptop-mode 1.47-1ubuntu2).

The combination of pulling the proper IWL into WIFI_IFNAMES (# LP: #369113) from Lucid .deb's wireless-iwl-power (also defining $IWLCONFIG!) and the "power off" "power on" lines from Sergio's patch into Karmic's wireless-iwl-power fixed it.

Brian Murray (brian-murray)
tags: added: patch
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