New F11 for XO-1.5 build 48

John Watlington wad at
Tue Dec 1 04:36:07 EST 2009

I would prefer to see the backlight dimming take place on a longer
time scale (as Paul says, I'm frequently still reading when it happens)
and the suspend happening much more aggressively.

Does OHM have user configurable knobs ?


On Nov 30, 2009, at 8:00 PM, Paul Fox wrote:

> chris wrote:
>> Hi,
>>> The advantages in terms of energy use must surely be tiny given
>>> that we're talking about 5sec of reducing consumption by maybe
>>> 0.5W.  On the other hand turning off the backlight completely
>>> after a certain amount of time as a first measure to reduce power
>>> consumption strikes me as an interesting alternative to the
>>> current implementation...
>> We'll do both -- dim the backlight and suspend, and set an alarm  
>> for a
>> wakeup to turn off the screen altogether a few minutes later.  The
>> reason for leaving the backlight dimmed for a few minutes is that it
>> might be possible for you to continue to read the web or book page
>> that you're looking at while it's dimmed and we're saving the big
>> watts.
> clearly we'll know more as we all use it more.  i currently find
> the 20 second timeout much too short -- it's far too likely that
> i'll still be looking at the screen.
>> Dimming the screen when idle is extremely common for laptops; OS X
>> and gnome-power-manager do it too, so I don't think it's too much of
>> a distraction.  With the new versions of OHM, I do the dimming as a
>> fade rather than an atomic change, so that should help it be less
>> distracting too.  (If it still feels distracting, I could make the
>> fade take a little longer?  It takes around 150ms right now.)
> i also find the fade-up to be more distracting than the
> fade-down.  and i think it makes the resume appear to take longer
> than it really does.  (i tried the fade-up in powerd, and
> switched to instant-on pretty quickly.)
> paul
> =---------------------
>  paul fox, pgf at
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