hybrid-graphics-linux team mailing list archive

[Pete Goodall <pete@xxxxxxxxxxxxxxx>]

Hi Michal,

Here is what I get, but I'm not sure it confirms my earlier observation:

$ cat /proc/acpi/battery/*/state
present:                 yes
capacity state:          ok
charging state:          discharging
present rate:            18885 mW
remaining capacity:      52950 mWh
present voltage:         15480 mV
$ echo '\_SB.PCI0.PEG1.GFX0._OFF' > /proc/acpi/call
$ cat /proc/acpi/battery/*/state
present:                 yes
capacity state:          ok
charging state:          discharging
present rate:            11310 mW
remaining capacity:      52110 mWh
present voltage:         15583 mV

I waited about four minutes after turning the card off.  I was
measuring the time savings before by depending on gnome-power-manager.
 That is probably a mistake. :-/

Hope this help.

- Pete


On 6 April 2011 12:54, Michal Kottman <k0mpjut0r@xxxxxxxxx> wrote:
> On Wed, 2011-04-06 at 11:20 +0100, Pete Goodall wrote:
>> Hi all,
>>
>> So I checked out the latest acpi_call from git, ran make and inserted
>> the module.  When I run the test_off.sh script I find a method that
>> works.  However, my battery time remaining goes *down* not up.  I also
>> have a modified version of the script that basically only tries the
>> method that worked for my laptop (\_SB.PCI0.PEG1.GFX0._OFF) and I
>> replace OFF with ON.  Afaict this will turn the discrete graphics back
>> on.  When I do this my battery life now shows an additional two hours
>> remaining.
>>
>> This makes no sense to me, so I'm wondering if I'm misunderstanding
>> the purpose of the script.  I thought this script was designed to turn
>> off the discrete graphics chip so I had less battery drain.  However,
>> from this testing it seems I get more battery drain when it is off.
>> Am I wrong?
>
> This is VERY strange. It seems that the producer your laptop has a sense
> of humor. We generally do not know what the methods do (and don't have
> the hardware to try it out, that's why we need your help), and expect
> they work according to their name.
>
> In your case, GFX0._OFF, we would expect that it would turn the card off
> and the resulting rate would lower. It would be best if you could
> provide a listing showing the following commands, to verify your claims:
>
> $ cat /proc/acpi/battery/*/state
> $ echo '\_SB.PCI0.PEG1.GFX0._OFF' > /proc/acpi/call
>
> ... wait for a while ...
>
> $ cat /proc/acpi/battery/*/state
>
> If it really turns out that _OFF uses more power, then we'll change the
> call to _ON :)
>
>
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-- 
Pete Goodall <pete@xxxxxxxxxxxxxxx>