7 Dec
2011
7 Dec
'11
11:19 a.m.
On 7 December 2011 10:57, Serghei Amelian
<serghei(a)thel.ro> wrote:
Calvin is correct. All the features in kpowersave need to be available
from its replacement, or we will be stuck with HAL forever. ;-)
I use the ability to change the CPU governer all the time. I like to
think I am smarter than the computer and know more precisely when I need
high speed and "snappiness" versus long battery life.
Tim
Hello,
I need some opinions about features provided by Power Management System.
So far I implemented a battery monitor and backlight control. Now, I
want
to
debate about:
1) Governors. KPowersave come with governor controller, but a guy from
#udev
irc channel adviced me that is actually is not
necessary to implement it
in a
gui interface, because actually we don't want to change governors but we
need
to burn less energy.
Check this "good practices" guide:
http://www.codon.org.uk/~mjg59/power/good_practices.html
Again, a power manager needs to manage the power. There are probably
situtations where people want to use powersave or use performance, either
way the power manager should allow me to adjust my CPU state.
2) DPMS and screensavers. In my opinion, DPMS
control should be passed
to
screensaver, not to be controlled by power manager.
Why? I think that Power Manager should react only to events related to
power
supplies (like AC adapter plugged in, AC unplugged, battery low, etc) or
ACPI
events like "lid closed", "power button pressed", etc.
Right and these things need to load different profiles which are preset.
Shutting down the monitor when the user is away
from keyboard is not
exactly
related to power management, seem natural to be a part of screensaver.
Opinions? Ideas?
I think you have the wrong idea. "power management" refers to managing the
power usage and controls things that change this. DPMS (aka power display
for monitors) should belong here. Laptop Screens and Monitors both pull an
enormous amount of power and it is up to the power manager to utilize this
appropriately. Not to mention the power manager is required to set
different profiles to control my screen settings.
if the screensaver had to do this, then the screen saver would end up
reimplementing the profiles and make it an enormous PITA.
the reason HAL was great is because it allowed me to manage all of my
power
needs from a single library. I don't understand why this was bad. As long
as the library or application is well written, there is no reason we
shouldn't implement all the things we need. that means we need DPMS and
CPU
freq settings and backlight and more. why? because they are all power
related functions.