LinuxQuestions.org
Welcome to the most active Linux Forum on the web.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Distributions > Bodhi
User Name
Password
Bodhi This forum is for the discussion of Bodhi Linux.

Notices


Reply
  Search this Thread
Old 03-08-2019, 08:37 AM   #1
madmax25
Member
 
Registered: Aug 2018
Posts: 136

Rep: Reputation: Disabled
Arrow BL.4.5.0-32bit - How to increase display brightness beyond 100%, please?


Usually, on my little netbook, I can adjust the brightness of my display by pressing Fn+F4 or Fn+F5.

But even with the brightness at its maximum, the display is quite dark.

Is there a way to increase the maximum?

I already tried to edit
Code:
/sys/class/backlight/acpi_video0/max_brightness
from 8 (default) to let's say 10, but the file refuses to be edited, even as sudo.

Now, what can I do to increase the brightness of my display, please?
 
Old 03-08-2019, 08:40 AM   #2
hemlocktree
Member
 
Registered: Aug 2018
Location: Northern Exposure
Distribution: Bodhi 5
Posts: 490

Rep: Reputation: 207Reputation: 207Reputation: 207
i believe physically that highest you can get is the hidhest you can get re: limits. ther is no way to go beyond it as such. the screen can only put out so much and then that is it.
 
Old 03-08-2019, 09:11 AM   #3
madmax25
Member
 
Registered: Aug 2018
Posts: 136

Original Poster
Rep: Reputation: Disabled
Ok, but then I wonder, how can it be, VLC can make videos much brighter?

Isn't there by any chance some tool capable of doing something similar for Bodhi?
 
Old 03-08-2019, 09:24 AM   #4
hemlocktree
Member
 
Registered: Aug 2018
Location: Northern Exposure
Distribution: Bodhi 5
Posts: 490

Rep: Reputation: 207Reputation: 207Reputation: 207
no clue. sorry.
 
Old 03-08-2019, 04:03 PM   #5
RonCam
Member
 
Registered: Dec 2008
Posts: 78

Rep: Reputation: 28
Quote:
Originally Posted by madmax25 View Post
...
I already tried to edit
Code:
/sys/class/backlight/acpi_video0/max_brightness
from 8 (default) to let's say 10, but the file refuses to be edited, even as sudo.
Just for comparison, on an eeePC, in the directories eeePC and intel_backlight we have max_brightness values of 15 and 125, respectively.
 
1 members found this post helpful.
Old 03-08-2019, 04:20 PM   #6
rbtylee
Bodhi Developer
 
Registered: Jun 2018
Location: Ladson, SC US
Distribution: Bodhi
Posts: 127

Rep: Reputation: 147Reputation: 147
Quote:
Originally Posted by madmax25 View Post
...

I already tried to edit
Code:
/sys/class/backlight/acpi_video0/max_brightness
from 8 (default) to let's say 10, but the file refuses to be edited, even as sudo.

...
Root should be able to edit that file but you can not enter a value that the driver thinks does not exist.

Have you tried the backlight module?
 
1 members found this post helpful.
Old 03-10-2019, 06:38 AM   #7
ondoho
LQ Addict
 
Registered: Dec 2013
Posts: 11,046
Blog Entries: 7

Rep: Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780
i think the max_brightness is a read-only value provided by the hardware. it's the maximum brightness possible.
the number does not reflect physical brightness; if it's 8, it means you can adjust brightness in 8 steps, no more.

there must be another file in that directory that you can echo a value between 0 and 8 into. as root.
sorry, i don't have a laptop atm so i can't be more precise.

the actual full brightness varies wildly between different (physical) screens, but you can only measure it from the outside.

VLC does not make it brighter; maybe there's just more contrast.

that said, it is possible that the desktop environments brightness adjustment thingymajick has gone haywire.
i suggest trying the command line trick again, maybe as described here.
 
Old 03-15-2019, 08:11 AM   #8
madmax25
Member
 
Registered: Aug 2018
Posts: 136

Original Poster
Rep: Reputation: Disabled
@ rbtylee
Yes, I tried this module, but it is set to its maximum already.

@ ondoho
With the value of 8 I reached the maximum already, but I'm looking for a way to reach 9 or 10. Of course, without damaging the display.

In VLC, I can increase both brightness and contrast, but they affect only videos, not the system itself.


EDIT:
The xbacklight package doesn't give me more brightness than the backlight module does.

Last edited by madmax25; 03-15-2019 at 08:31 AM.
 
Old 03-15-2019, 08:36 AM   #9
BW-userx
LQ Guru
 
Registered: Sep 2013
Location: MID-SOUTH USA
Distribution: Slackware 14.2 current / Linux Mint / Debian / Void Linux
Posts: 8,131

Rep: Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677
yes, you need to check your max brightness then adjust it accordingly,
max_brightness just tells you the max_brightness you can obtain, you need to adjust the brightness in the brightness file in the same directory. Adjust in increments of positive whole numbers to max_brightness. 0 ... max_brightness in the brightness file, not the max_brightness file.

on this laptop HP 8460p
Code:
$ ls   /sys/class/backlight/radeon_bl0
actual_brightness  brightness  max_brightness  subsystem  uevent
bl_power           device      power           type
Code:
$ cat   /sys/class/backlight/radeon_bl0/max_brightness
255

$ cat   /sys/class/backlight/radeon_bl0/brightness
253
example working script
Code:

#!/bin/bash
# for use to set laptop backlight on 
# hp 8460p with ATI graphics card, and hp 840 g2
# intel graphics chip
# Run as user with sudo permissions nopasswd
# should be able to use with passwd
#Monday Feb 18, 2019
 


if [[ -z $1 ]] ; then
	#check for hp 8460p setting or hp 840 g2 setting
	[[ -d /sys/class/backlight/radeon_bl0/brightness ]] && \
	{ sudo su -c ' echo 200 >  /sys/class/backlight/radeon_bl0/brightness' ; \
	  echo "Backlight Max setting is $(cat /sys/class/backlight/radeon_bl0/max_brightness)" ; \
	  echo "Backlight is set at $(cat /sys/class/backlight/radeon_bl0/brightness) " ; }
	  
	  [[ -d /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight ]] && \
	  { sudo su -c 'echo 800 > /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight/brightness' ; \
		  echo "Backlight Max setting is $(cat /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight/max_brightness)" ; \
		  echo "Backlight is set at $(cat /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight/brightness)" ; }
else
	[[ -d /sys/class/backlight/radeon_bl0/brightness ]] && \
	{ sudo su -c ' echo $1 >  /sys/class/backlight/radeon_bl0/brightness' ; \
	  echo "Backlight Max setting is $(cat /sys/class/backlight/radeon_bl0/max_brightness)" ; \
	  echo "Backlight is set at $(cat /sys/class/backlight/radeon_bl0/brightness) " ; }
	  
	  [[ -d /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight ]] && \
	  { sudo su -c 'echo $1 > /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight/brightness' ; \
		  echo "Backlight Max setting is $(cat /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight/max_brightness)" ; \
		  echo "Backlight is set at $(cat /sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight/brightness)" ; }
fi
the system will not allow a higher setting than what is in max_brightness. just locate that file then check to see what it is.

Last edited by BW-userx; 03-15-2019 at 09:14 AM.
 
2 members found this post helpful.
Old 03-15-2019, 04:13 PM   #10
madmax25
Member
 
Registered: Aug 2018
Posts: 136

Original Poster
Rep: Reputation: Disabled
Quote:
Originally Posted by BW-userx View Post
the system will not allow a higher setting than what is in max_brightness.
Indeed, that's my problem.

The max_brightness file only allows me to increase the brightness up to 8 and the Fn keys for the brightness do also work fine, but I can't get more brightness than the 8.
Unfortunately, even with the brightness set to its possible maximum of 8, I think, the display is too dark.

That's why I wanted to set a higher value in that max_brightness file, but the system doesn't allow me to edit it, not even as sudo, because I get the message "Cannot open file to overwrite."

Last edited by madmax25; 03-15-2019 at 04:20 PM.
 
1 members found this post helpful.
Old 03-15-2019, 04:55 PM   #11
rbtylee
Bodhi Developer
 
Registered: Jun 2018
Location: Ladson, SC US
Distribution: Bodhi
Posts: 127

Rep: Reputation: 147Reputation: 147
Maybe it is something else other than brightness you are looking for, see How do I adjust the screen contrast?.
 
Old 03-15-2019, 05:38 PM   #12
BW-userx
LQ Guru
 
Registered: Sep 2013
Location: MID-SOUTH USA
Distribution: Slackware 14.2 current / Linux Mint / Debian / Void Linux
Posts: 8,131

Rep: Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677
Quote:
Originally Posted by madmax25 View Post
Indeed, that's my problem.

The max_brightness file only allows me to increase the brightness up to 8 and the Fn keys for the brightness do also work fine, but I can't get more brightness than the 8.
Unfortunately, even with the brightness set to its possible maximum of 8, I think, the display is too dark.

That's why I wanted to set a higher value in that max_brightness file, but the system doesn't allow me to edit it, not even as sudo, because I get the message "Cannot open file to overwrite."
one you missed the part where that file,max_brightness is not made to be edited by user period.
the brightness file is. and that is the max limit that is set by the manufacturer of the item. so no you can not get over 100 percent on it.

being a net book the screen probably, I'd say is not a quality screen. get a better laptop with a better display, or look into seeing if that one can be upgraded with a better screen, or use it in a darker environment.

as far as watching movies as suggested, even I increase the brightness of some movies with what ever movie player I am using (MPV) then adjust the contrast to blend it into a nicer not so over powered washed out look.

In summery, there is no easy fix for this other than getting something that has a better display, or replacing your current with a better display. which can be done, if the manufacturer of that netbook has made other higher quality screens for it, as I have done it with this very laptop. taken out the screen and replaced with one that has a higher resolution. It is not a hard task.

if it is an old screen maybe getting a new one will look brighter. because it will not be as worn out.

other wise you're stuck with what you have, and you'll have to learn how to deal with it.

Last edited by BW-userx; 03-15-2019 at 05:42 PM.
 
1 members found this post helpful.
Old 03-16-2019, 04:44 AM   #13
ondoho
LQ Addict
 
Registered: Dec 2013
Posts: 11,046
Blog Entries: 7

Rep: Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780Reputation: 2780
Quote:
Originally Posted by madmax25 View Post
@ ondoho
With the value of 8 I reached the maximum already, but I'm looking for a way to reach 9 or 10. Of course, without damaging the display.
this is physically impossible.
please re-read my last post.
 
Old 03-16-2019, 06:57 AM   #14
madmax25
Member
 
Registered: Aug 2018
Posts: 136

Original Poster
Rep: Reputation: Disabled
I know, it's the brightness file, that's meant for adjustments.
I was hoping, I could find a way to get a higher range of brightness.

Sad to learn, there's no software solution for this, and the only solution is to get another hardware.
But ok, I have to confess, this netbook is in fact very old (I got it back in 2008) and in all these years, the display probably has lost a part of its brightness anyway.
 
1 members found this post helpful.
Old 03-16-2019, 07:18 AM   #15
BW-userx
LQ Guru
 
Registered: Sep 2013
Location: MID-SOUTH USA
Distribution: Slackware 14.2 current / Linux Mint / Debian / Void Linux
Posts: 8,131

Rep: Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677Reputation: 1677
its called, or referred to as, "physical limitations"
 
1 members found this post helpful.
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
Can't adjust brightness with function key and can't adjust brightness after suspend. QuarkDev Linux Deepin 2 03-19-2015 10:46 AM
Mint 15 = black screen (brightness = 0) on start up - have to manually set brightness Netnovice Linux Mint 4 01-16-2014 08:46 PM
[SOLVED] Brightness set to zero: moved to http://www.linuxquestions.org/questions/slackware-14/brightness-set Z0K4 Linux - Laptop and Netbook 5 09-15-2011 10:09 AM
Fedora 13 32bit and then Linux Mint 32bit and then Ubuntu 10.04 32bit ciao303 Linux - Newbie 3 08-09-2010 11:03 PM
How to increase/decrease brightness? ginda Linux - Newbie 3 02-01-2005 10:25 PM

LinuxQuestions.org > Forums > Linux Forums > Linux - Distributions > Bodhi

All times are GMT -5. The time now is 03:43 AM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration