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Old 11-22-2012, 01:35 PM   #1
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Turn off PW light completely
Even at the lowest setting (0), the light is on. Will there ever be a tweak/hack that allows it to be off completely?
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Old 11-22-2012, 01:47 PM   #2
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Hmm. there is one IIRC. maybe GM knows
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Old 11-22-2012, 02:51 PM   #3
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Quote:
Originally Posted by twobob View Post
Hmm. there is one IIRC. maybe GM knows
Maybe?

How to control PW backlight brightness (including completely OFF):
https://www.mobileread.com/forums/sho....php?p=2252313

Quote:
Originally Posted by geekmaster View Post
... Now let's try to turn [the backlight] COMPLETELY off:
[root@kindle /]# echo -n 0 > /sys/devices/system/fl_tps6116x/fl_tps6116x0/fl_intensity
Yes, it is completely off even while awake! ...
Last edited by geekmaster; 11-22-2012 at 02:55 PM.
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Old 11-22-2012, 04:31 PM   #4
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tee hee hee.

I should get as good odds on a horse.
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Old 11-22-2012, 08:47 PM   #5
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There's also a 'debug' command (;toggleLight, IIRC) .

EDIT: It simply calls
Code:
xtestlab126 -l
Last edited by NiLuJe; 11-23-2012 at 01:12 PM.
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Old 12-07-2012, 03:47 AM   #6
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So does this work? Just entering ";toggleLight" in the search bar?
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Old 12-08-2012, 12:06 AM   #7
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allegedly so
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Old 12-08-2012, 12:47 AM   #8
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Quote:
Originally Posted by NiLuJe View Post
There's also a 'debug' command (;toggleLight, IIRC) .

EDIT: It simply calls
Code:
xtestlab126 -l
... which uses functions from /usr/lib/libfrontlight.so, which is somehow related to /dev/yoshime_fl.

(Just was curious.)
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Old 12-13-2012, 01:29 AM   #9
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Quote:
Originally Posted by geekmaster View Post
How to control PW backlight brightness (including completely OFF):
https://www.mobileread.com/forums/sho....php?p=2252313
Can you tell me step by step to do that?
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Old 12-13-2012, 01:36 AM   #10
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Quote:
Originally Posted by phuongxuanhieu View Post
Can you tell me step by step to do that?
If you click that link in your quote, you will see that it does a series of "step by step" experiments, showing how to read and write brightness values (including completely off) to the PW backlight.

Those steps cannot really be broken down into smaller steps. What more do you need? Your request has me a bit puzzled...

You can do those commands from a shell script, or from an USB networking SSH command shell. They are just simple linux commands.
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Old 12-13-2012, 04:09 PM   #11
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So does this work? Just entering ";toggleLight" in the search bar?
This command gives me a Horizontal Slider where I can turn the light brightness Up or Down. I don't know if it turns it off completely.
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Old 12-13-2012, 04:59 PM   #12
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Quote:
Originally Posted by FF2 View Post
This command gives me a Horizontal Slider where I can turn the light brightness Up or Down. I don't know if it turns it off completely.
Just tried it, and I confirm that it shows a horizontal version of the "light intensity" bar. Seems like it's pretty much the same as the "normal" one, except that it's horizontal and not as fancy. It won't allow you to turn the light off completely.

To really control it (including turning it off), use the commands that geekmaster posted in the other thread:

Code:
echo -n LEVEL > /sys/devices/system/fl_tps6116x/fl_tps6116x0/fl_intensity
where LEVEL is an integer between 0 and 254 (or 255?), and 0 means "light off". You have to run these commands from a command line, so install the usbnetwork package and access your device through that.

Sorry, but there is no "step-for-step tutorial" for using Linux command line tools - if you want to dive into it, you have to learn it the hard way, like everybody else here did.
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