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 Forum index » Taking the Puppy out for a walk » Misc
Other Distros
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greengeek

Joined: 20 Jul 2010
Posts: 2477
Location: New Zealand

PostPosted: Mon 26 Nov 2012, 14:36    Post subject:  

rcrsn51 wrote:
So it takes more power to create more dark regions on the display.

I guess that means that every black pixel has fully lighted pixels hiding behind it? What if a particular pixel was "almost black? Are there "halfway states" of the polarised filtration? I wonder what colour would be the lowest overall power consumption for a desktop/background. And whats the difference between a traditional LCD screen and the newer LED LCD screens? - I'm guessing that the older LCD screens must keep the light (fluoro) on all the time and black out pixels as required, but I wonder if the LED ones have a single white LED at each pixel location - allowing dimming to be controlled on a "per pixel" level?
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rcrsn51


Joined: 05 Sep 2006
Posts: 9036
Location: Stratford, Ontario

PostPosted: Mon 26 Nov 2012, 17:43    Post subject:  

greengeek wrote:
I'm guessing that the older LCD screens must keep the light (fluoro) on all the time and black out pixels as required, but I wonder if the LED ones have a single white LED at each pixel location - allowing dimming to be controlled on a "per pixel" level?

LED monitors are still LCD displays. But they use LED lights instead of cold cathode fluorescent tubes to create the backlighting. So they are more energy-efficient.

If you want to see an interesting effect, hold a pair of anti-glare sunglasses in front of your LCD monitor and slowly rotate them.
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greengeek

Joined: 20 Jul 2010
Posts: 2477
Location: New Zealand

PostPosted: Mon 26 Nov 2012, 23:23    Post subject:  

Ahh, yes. The greater the rotation, the greater the attenuation of light. Is that how each pixel intensity is controlled?
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rcrsn51


Joined: 05 Sep 2006
Posts: 9036
Location: Stratford, Ontario

PostPosted: Tue 27 Nov 2012, 12:26    Post subject:  

Here's an interesting question with LCD monitors. If you go into the monitor's control panel and decrease the brightness, what are you actually doing?

Are you lowering the intensity of the backlighting, thereby saving energy?

Or are you just raising the base amount of filtering, thereby using more energy?

Since LED lights are basically either on or off, I wonder if it's the latter?
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nooby

Joined: 29 Jun 2008
Posts: 10557
Location: SwedenEurope

PostPosted: Tue 27 Nov 2012, 12:40    Post subject:  

Re other Distros.

I read about this one Redo and downloaded it
http://distrowatch.com/?newsid=07574

Quote:


Redo Backup & Recovery 1.0.4 has been released.
Redo is an Ubuntu-based live CD featuring backup, restore,
and disaster recovery software, with an easy-to-use graphical program
for running bare-metal backup and recovery of hard disk partitions.
What's new in this release? "Base upgrade to Ubuntu 12.04 LTS ...


Here is how I boot this Ubuntu variant

Code:

 title redo frugal iso boot
 find --set-root --ignore-floppies --ignore-cd /redo/casper/initrd.lz
kernel /redo/casper/vmlinuz rw boot=casper iso-scan/filename=/redo.iso ramdisk_size=1048576 root=/dev/ram  noeject noprompt
initrd /redo/casper/initrd.lz


One drag casper directory out of the iso using puppy
I am writing from Redo now using the built in Chrome browser.
It can access my NTFS hd but I failed to get it opening html files
due to being root something.

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Last edited by nooby on Tue 27 Nov 2012, 13:18; edited 2 times in total
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sketchman


Joined: 01 Jun 2006
Posts: 250
Location: West Virginia, USA

PostPosted: Tue 27 Nov 2012, 12:41    Post subject:  

rcrsn51 wrote:

Since LED lights are basically either on or off, I wonder if it's the latter?


That's not really true though. You can use a POT or resistors to vary the brightness of a plain old LED just fine. I know because I did some automotive gauge cluster lighting, and turned down the brightness of some LED backlighting with resistors so it didn't blind me at night. I would imagine you're controlling the backlight brightness with either setup.

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rcrsn51


Joined: 05 Sep 2006
Posts: 9036
Location: Stratford, Ontario

PostPosted: Tue 27 Nov 2012, 12:48    Post subject:  

Thanks. This article seems to confirm that.
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nubc


Joined: 23 Jan 2007
Posts: 1033
Location: USA

PostPosted: Tue 27 Nov 2012, 13:44    Post subject:  

For best image, I set CONTRAST at 90 to 95% (which usually gives a good black, depending on raster), and then adjust BRIGHTNESS to 50% or less, depending on ambient light. If there is color flare, like in red or orange, I will tweak the CONTRAST down until flare disappears, and then readjust BRIGHTNESS if necessary.

Is this opposite to recommended adjustment procedure? And, does setting CONTRAST so high shorten the life of the monitor?

Last edited by nubc on Tue 27 Nov 2012, 14:12; edited 3 times in total
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sketchman


Joined: 01 Jun 2006
Posts: 250
Location: West Virginia, USA

PostPosted: Tue 27 Nov 2012, 14:02    Post subject:  

You guys got me thinking and playing around with my monitor settings. Mine has separate adjustments for backlight level and brightness, so now I'm thoroughly confused. I just use the lowest brightness and backlight setting I can get away with and still be viewable so as not to burn my eyes out. The stock setting kills me. Still don't know the technical difference, but apparently it does adjust something to do with the color producing parts as well as the backlight. So if you have a monitor that has just one setting, who knows which one you're adjusting? Maybe a mix of both?

My computer and monitor are hooked up to a UPS that shows power consumption. I may check it out with full on brightness and backlighting and compare it to full dark and as low as the light will go to see the real difference.

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sketchman


Joined: 01 Jun 2006
Posts: 250
Location: West Virginia, USA

PostPosted: Tue 27 Nov 2012, 15:08    Post subject:  

Number time.

Keep in mind these figures are purely for giggles. The extreme ends of the spectrum are unusable, so you're getting info on an amount of backlighting that I'm confident no human eyes could stand for long, as well as brightness that is so washed out it's unusable. It's just for reference.

At my personal setting: BL 22, Bright 43, Con 50
PC and 26" 1920x1080 LED lit: 96 watts total with the PC idling on the desktop with a nice balance of darks, lights, and plenty of contrast needed to show the details.

Cranking the BL up to max: BL 100, Bright 43, Con 50 -- 116 watts total
More Bright: BL 100, Bright 100, Con 50 -- 116 watts total
"No" BL: BL 0, Bright 100, Con 50 -- 80 watts total

As you can see, whatever the Brightness control is adjusting seems to do pretty much nothing to power consumption on my setup, while the backlight seems to be drawing around 36 watts nearly all on its own when set to max. Shocked I believe it too. It's CRAZY bright.

I guess the thread is thoroughly derailed now. Rolling Eyes

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greengeek

Joined: 20 Jul 2010
Posts: 2477
Location: New Zealand

PostPosted: Wed 28 Nov 2012, 01:14    Post subject:  

sketchman wrote:
I guess the thread is thoroughly derailed now. Rolling Eyes

Interesting though. I have a passion for low energy devices as some of my gear is run in a workshop that has no mains power - only solar. I think it would be great to have a topic that discussed low power computing. There are so many neat devices coming on stream now. One of my projects is a eeepc that is charged/run by solar panels. (It is VERY economical after sundown - it draws no power at all!)
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Colonel Panic


Joined: 16 Sep 2006
Posts: 1510

PostPosted: Thu 29 Nov 2012, 08:48    Post subject:  

greengeek wrote:
sketchman wrote:
I guess the thread is thoroughly derailed now. Rolling Eyes


Interesting though. I have a passion for low energy devices as some of my gear is run in a workshop that has no mains power - only solar. I think it would be great to have a topic that discussed low power computing. There are so many neat devices coming on stream now. One of my projects is a eeepc that is charged/run by solar panels. (It is VERY economical after sundown - it draws no power at all!)


Yeah, it'd be a good topic for this forum now that so many people are trying to save energy for environmental as well as financial reasons.

I installed OpenSUSE Edu-life yesterday, and something went wrong with the configuration so that when I boot up I get a root terminal instead of a desktop / window manager. I have to enter at the terminal which of KDE or Gnome I want before I can get a desktop session. Once you get past that though, it's pretty good.

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Last edited by Colonel Panic on Thu 29 Nov 2012, 11:55; edited 1 time in total
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nooby

Joined: 29 Jun 2008
Posts: 10557
Location: SwedenEurope

PostPosted: Thu 29 Nov 2012, 09:10    Post subject:  

http://www.murga-linux.com/puppy/posting.php?mode=editpost&p=667447
Redo Linux that I write about above reminded me of Xpud
in that both are based on Ubuntu and both very small.

But xpud has much more functionality if one download the appications
that he prepared for it.

Sadly he is now unto other challenges so it is not updated anymore.

Any other here that liked xpud?

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puppy_apprentice


Joined: 07 Feb 2012
Posts: 134

PostPosted: Thu 29 Nov 2012, 12:45    Post subject:  

you can try to install new apps in Redo Linux via apt-get
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sketchman


Joined: 01 Jun 2006
Posts: 250
Location: West Virginia, USA

PostPosted: Thu 29 Nov 2012, 13:04    Post subject:  

puppy_apprentice wrote:
you can try to install new apps in Redo Linux via apt-get


It doesn't have Synaptic or Software Center? If not, Synaptic would be my first installed app. Sky's the limit from there.

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