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Old 07-13-2017, 08:53 PM   #1
Ztcoracat
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Slackware 14.2 and a 26' Vizio T.V.


Hi:

After years of that little 19' Acer monitor opportunity knocked and I switched to a bigger monitor, my T.V.:-

A few days ago I hooked up my 26' Vizio T.V. to my Slackware box.
All I had to do was disconnect the 15 pin cable from the Acer that was connected to my GPU and plug it into the RGB pc slot on my Vizio.

Linux ROCKS on this T.V. for a monitor but certain pages are blinding!
If it wasn't for the dark pc glasses that I wear I'd probably be 1/2 blind by now. lol

Any ideas on how I can dim the screen?

I installed redshift but it's not launching:-
https://slackbuilds.org/repository/1...earch=redshift

Last edited by Ztcoracat; 07-13-2017 at 10:04 PM.
 
Old 07-14-2017, 03:00 PM   #2
montagdude
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Usually TVs have brightness settings that are accessible via the remote or buttons on the monitor. I'm not sure if it's possible to control it via your computer.
 
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Old 07-14-2017, 04:28 PM   #3
Ztcoracat
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I checked the buttons on the remote and on the T.V. itself. No dice.

Looking on Amazon I was able to find a filter for $68.00. Little ridiculous for a piece of tinted plastic but I may consider it over time.

Red Shift didn't launch for me last night. I'll try to get it working today and see what happens.
 
Old 07-14-2017, 05:44 PM   #4
Ztcoracat
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A friend and I went through the Menu together and found a Setting for the Picture.

The brightness was set to 50% so I had him adjusted it all the way down to 1% and now the screen on white pages aren't so bad anymore.

I'd still like to know if there is software for this.

I found an article that was Windows related. There is a program called Screen Tinter Lite. So I'll head over to Alternative to and see if there is a Linux alternative app:-

If I find one I'll post it.

Oh yeah, those plastic film covers that fit over pc monitors and the like are between $50.00 and $200.00 dollars.
The one company that makes them is called Low Blue Lights.

Last edited by Ztcoracat; 07-14-2017 at 08:44 PM.
 
Old 07-14-2017, 07:58 PM   #5
montagdude
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xrandr has a pseudo brightness control that might work for your TV. E.g.:

Code:
xrandr --output HDMI1 --brightness 0.4
From the man page:
Quote:
--brightness brightness
Multiply the gamma values on the crtc currently attached to the
output to specified floating value. Useful for overly bright or
overly dim outputs. However, this is a software only modifica‐
tion, if your hardware has support to actually change the
brightness, you will probably prefer to use xbacklight.
Maybe xbacklight would work too, but I don't know of a way to specify a monitor for xbacklight.
 
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Old 07-14-2017, 08:43 PM   #6
Ztcoracat
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Quote:
Originally Posted by montagdude View Post
xrandr has a pseudo brightness control that might work for your TV. E.g.:

Code:
xrandr --output HDMI1 --brightness 0.4
From the man page:
Maybe xbacklight would work too, but I don't know of a way to specify a monitor for xbacklight.
Thanks montagdude.-

I don't have a HDMI cable at the moment so I'm not sure if xrandr will work. I'll have to pick one up.

I'll check out xbacklight and read the man page:-

For now the brightness is gone and I'm not getting that nasty headache anymore.
 
Old 07-14-2017, 08:58 PM   #7
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It doesn't need to be HDMI. That was just my guess. You can use xrandr -q to find out the names of the monitors available.
 
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Old 07-14-2017, 09:26 PM   #8
Ztcoracat
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Quote:
Originally Posted by montagdude View Post
It doesn't need to be HDMI. That was just my guess. You can use xrandr -q to find out the names of the monitors available.
Oh, ok:-

Code:
bash-4.3$ xrandr -q
Screen 0: minimum 320 x 200, current 1360 x 768, maximum 16384 x 16384
DisplayPort-0 disconnected primary (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-0 disconnected (normal left inverted right x axis y axis)
DVI-1 connected 1360x768+0+0 (normal left inverted right x axis y axis) 575mm x 323mm
   1360x768      60.02*+
   1024x768      75.08    70.07    60.00  
   832x624       74.55  
   800x600       75.00    60.32  
   640x480       75.00    60.00  
   720x400       70.08
1024 x 768 shows on the screen when Grub boots.

I'll have to due some reading over the weekend as I've never use xrandr or xbacklight before. And re-read the flags on the man page to manipulate things.

I think I know why Red Shift won't launch. It's Gnome based and there is nothing Gnome on my Slack box.
I'm not a fan of Gnome.
 
Old 07-14-2017, 09:37 PM   #9
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Quote:
Originally Posted by Ztcoracat View Post
I checked the buttons on the remote and on the T.V. itself. No dice.

Looking on Amazon I was able to find a filter for $68.00. Little ridiculous for a piece of tinted plastic but I may consider it over time.

Red Shift didn't launch for me last night. I'll try to get it working today and see what happens.
Your TV should have a menu. That's where you should look.
 
Old 07-15-2017, 01:05 PM   #10
enorbet
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Another possibility worth considering is investing in an HDMI cable assuming your monitor and graphics card have them. I have a 32" Vizio and an nVidia GTX 760 and there is very noticeable improvement using HDMI. This is not merely anecdotal as the comparison is well-documented even if HDMI's days are numbered thanks to USB 3.1.
 
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Old 07-15-2017, 03:35 PM   #11
Ztcoracat
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Quote:
Originally Posted by enorbet View Post
Another possibility worth considering is investing in an HDMI cable assuming your monitor and graphics card have them. I have a 32" Vizio and an nVidia GTX 760 and there is very noticeable improvement using HDMI. This is not merely anecdotal as the comparison is well-documented even if HDMI's days are numbered thanks to USB 3.1.
Yeah I plan on picking up a HDMI cable and this Vizio has an HDMI slot.

I think I'd like having sound from the T.V. rather than the sound coming from the speaker I have.
 
Old 07-15-2017, 03:35 PM   #12
Ztcoracat
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Quote:
Originally Posted by MikelN View Post
Your TV should have a menu. That's where you should look.
SEE post #4.
 
Old 07-15-2017, 04:30 PM   #13
Ztcoracat
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This is helpful is anyone needs more information about xrandr.

https://en.wikipedia.org/wiki/RandR

Links for xbacklight:
https://www.x.org/archive/X11R7.5/do...cklight.1.html

Code:
bash-4.3$ xbacklight -get
No outputs have backlight property
Trying to run "xbacklight -dec percent" should allow me to decrease the brightness by a specified amount. However it doesn't work for me because there aren't any outputs for the backlight property.

I'm happy with the brightness setting on my Vizio now and it's no longer blinding.
Thank you all for your help and support.
 
Old 07-16-2017, 12:13 AM   #14
MikelN
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Quote:
Originally Posted by Ztcoracat View Post
SEE post #4.
I'm just trying to help. You could be friendlier with responding. You never make a mistake? You never miss an answer and are all knowing? Why even post the question? Because apparently you already know. I've been using TV's on computers for DECADES. But all I want to tell you now is: RTFM!
 
Old 07-16-2017, 12:23 AM   #15
Ztcoracat
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Quote:
Originally Posted by MikelN View Post
I'm just trying to help. You could be friendlier with responding. You never make a mistake? You never miss an answer and are all knowing? Why even post the question? Because apparently you already know. I've been using TV's on computers for DECADES. But all I want to tell you now is: RTFM!
I was being brief because of time. I have a lot going on and was helping other members in the Forums.
I was not trying to be offensive or unappreciative of your time.
 
  


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