[kwlug-disc] Ubuntu Karmic and power management

Bob Jonkman bjonkman at sobac.com
Tue Nov 3 22:35:41 EST 2009


Khalid writes:

> To this:
>
> kernel          /boot/vmlinuz-2.6.31-14-generic
> root=UUID=d2d0abec-e28f-42bc-9afa-ba6faca5ed20 ro quiet splash *acpi_osi="Linux"*
>   

Surely we don't use the stars around the parameter? And I expect that 
was intended to be all on one line...


Where are these obscure things documented?  I found 
http://www.kernel.org/doc/Documentation/kernel-parameters.txt but it's 
remarkably vague on what the 'acpi_osi' strings are and what they  
actually do.

--Bob.


Khalid Baheyeldin wrote:
>  On Tue, Nov 3, 2009 at 5:44 PM, Khalid Baheyeldin <kb at 2bits.com> wrote:
>
>   
>> On Tue, Nov 3, 2009 at 3:13 PM, Charles M <chaslinux at gmail.com> wrote:
>>
>>     
>>> Has anyone found Karmic Koala's power management problematic? My
>>> notebook started overheating ever since I put Karmic Koala on it. I
>>> went back to Ubuntu 8.04-LTS and the overheating seems to have
>>> stopped. Just thought I'd mention this for anyone else thinking of
>>> upgrading to Karmic Koala.
>>>
>>>       
>> Now that you mention it, I felt that my left handrest area felt very hot
>> today.
>> This is where the hard disk is, I think.
>>
>> I also noticed that the Guidance Power Manager icon showed the that the
>> AC adapter is connected although I was on battery only.
>>
>> This is Kubuntu, not Ubuntu, but perhaps the problem is common.
>>
>> At the ACPI level, things seem to be working though:
>>
>> With AC adapter not connected:
>> # cat /proc/acpi/battery/BAT0/state
>> present:                 yes
>> capacity state:          ok
>> charging state:          discharging
>> present rate:            1789 mA
>> remaining capacity:      4347 mAh
>> present voltage:         10800 mV
>>
>> # cat /proc/acpi/ac_adapter/ADP0/state
>> state:                   off-line
>>
>> With AC adapter connected:
>> # cat /proc/acpi/battery/BAT0/state
>> present:                 yes
>> capacity state:          ok
>> charging state:          charged
>> present rate:            1183 mA
>> remaining capacity:      4391 mAh
>> present voltage:         10800 mV
>> # cat /proc/acpi/ac_adapter/ADP0/state
>> state:                   on-line
>>
>> So ACPI does detect what is going on. Perhaps another layer is botched
>> though.
>>
>>     
>
> I think I found a solution to this:
>
>
> Use this command to edit your grub menu.lst file.
>
> # sudo nano /boot/grub/menu.lst
>
> Then change the line that looks like this:
>
> kernel          /boot/vmlinuz-2.6.31-14-generic
> root=UUID=d2d0abec-e28f-42bc-9afa-ba6faca5ed20 ro quiet splash
>
> To this:
>
> kernel          /boot/vmlinuz-2.6.31-14-generic
> root=UUID=d2d0abec-e28f-42bc-9afa-ba6faca5ed20 ro quiet splash *
> acpi_osi="Linux"*
>
> The added acpi_osi="Linux" parameter makes the laptop stay between 42 and
> 49C, and disconnecting the AC causes Guidance Power Manager to detect such
> events correctly.
>   
>   



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