9.1 Proposal: Power.

Ed McNierney ed at laptop.org
Wed Oct 22 16:15:39 EDT 2008

Chris -

The OS X dimming is more than 10 seconds, but not much more.  OK, it's  
rather lame to make that assertion on a MacBook Pro without timing  

When running on battery with Energy Saver set to "Better Battery  
Life" (which sets "Automatically reduce the brightness of the display  
before display sleep") the backlight dims after 30 seconds.  On AC  
with the equivalent setting it's 2 minutes, 30 seconds.  In each case  
the dimming time seems to be 50% of the time until the screen is  
turned off.  1 minute is the minimum time before display sleep.

	- Ed

On Oct 22, 2008, at 3:37 PM, Chris Ball wrote:

> Hi,
>> as a G1G1 user one annoyance of enabling power savings is the
>> screen dimming while I am reading a page. I thought this was
>> supposed to be improved, but I saw the same thing when I upgraded
>> to 767 a week ago.
> There's a way this could be improved.  We previously had to dim the
> screen before CPU sleep because we weren't going to get a chance to
> dim it later -- once the CPU is off, it stays off.  Now that we have
> wakeup timers, we could do something like this:
>   idle+30s:  CPU sleeps
>   idle+2m:   wakeup to dim the backlight, back to sleep
>   idle+5m:   wakeup to turn off the screen, back to sleep
> I'm not yet entirely convinced that we should wait that long, though.
> Anyone who has used a laptop running OS X will have noticed that it
> dims the backlight after just a few (ten?) seconds of inactivity.
> I'll add this topic to the talk.  Thanks!
> - Chris.
> -- 
> Chris Ball   <cjb at laptop.org>
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