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Forum index » Advanced Topics » Additional Software (PETs, n' stuff) » Desktop

Brightness & colour temperature control for desktop PCs

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greengeek

Joined: 20 Jul 2010
Posts: 5359
Location: Republic of Novo Zelande

Posted: Wed 10 Oct 2018, 14:21 Post subject:

fredx181 wrote:

I cannot understand btw, what can be the problem when restarting X, but apparently for you there's some issue with that.

Yes, X restart is problematic for me - I will try to explain:

I try to keep my system small and "lean" - so I often use software by loading pets during a session - rather than having those pets permanently loaded into a savefile (I have no savefile).

Imagine the situation where I have a number of windows open (browser , word processor etc) and I decide the screen is too bright so I load Mikes pet to control gamma and brightness - if I am forced to restart X to get the pet working, then all of those windows will close and I will be back to a blank desktop and I will have to start my session all over again.

(Restart WM does not cause window loss)

fabrice_035

Joined: 28 Apr 2014
Posts: 542
Location: Bretagne / France

Posted: Wed 10 Oct 2018, 14:25 Post subject:

greengeek wrote:

Code:

xrandr --output LVDS1 --set BACKLIGHT 5

Code:

xrandr --output LVDS1 --set BACKLIGHT 10

("BACKLIGHT" must be uppercase)
.

Code:

root# xrandr | grep " connected " | awk '{ print$1 }'
HDMI-0
LVDS

root# xrandr --output LVDS --set BACKLIGHT 5
X Error of failed request: BadName (named color or font does not exist)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 11 (RRQueryOutputProperty)
Serial number of failed request: 33
Current serial number in output stream: 33
root#

greengeek

Joined: 20 Jul 2010
Posts: 5359
Location: Republic of Novo Zelande

Posted: Wed 10 Oct 2018, 14:32 Post subject:

Mike Walsh wrote:

Does anybody know where the script dealing with the contents of the notification area resides? Be interesting to find out, actually.:

Hi Mike,

I am no expert at this but hopefully I can show one method to position tray icons:

If you are using JWM as your WM, open the hidden file /root/.jwmrc-tray
Here is mine:

Code:

<JWM>
<Tray autohide="false" insert="right" x="0" y="-1" border="1" height="28" >
   
   <TrayButton label="Menu" icon="logo-mini.png" border="true">root:3</TrayButton>
   <TrayButton popup="Show Desktop" icon="mini-desktop.xpm" border="true">showdesktop</TrayButton>
   <TrayButton popup="Terminal" icon="/usr/local/lib/X11/pixmaps/console24.png" border="true">exec:urxvt</TrayButton>
   <TrayButton popup="Files" icon="/usr/local/lib/X11/pixmaps/folder24.png" border="true">exec:rox</TrayButton>
   <TrayButton popup="Browser" icon="/usr/local/lib/X11/pixmaps/www24.png" border="true">exec:defaultbrowser</TrayButton>
   <TrayButton popup="Leafpad" icon="/usr/local/lib/X11/mini-icons/leafpad.png" border="true">exec:leafpad</TrayButton>
   <TrayButton popup="BacklightUP" icon="/usr/local/lib/X11/pixmaps/brightup24.png" border="true">exec:xbacklight +15</TrayButton>
   <TrayButton popup="BacklightDWN" icon="/usr/local/lib/X11/pixmaps/brightdwn24.png" border="true">exec:xbacklight -10</TrayButton>

   <TrayButton popup="XVkbd" icon="/usr/local/lib/X11/pixmaps/kbd24.png" border="true">exec:xvkbdstart</TrayButton>
   <Pager/>
   
   <TaskList maxwidth="200"/>
   <Dock/>
   



      

   <Swallow name="xload" width="32">
      xload -nolabel -bg "#888888" -fg red -hl white
   </Swallow>
   <Clock format="%H:%M">minixcal</Clock>
</Tray>
</JWM>

I can now add in the line that Mochi was using to position his unicode symbol as a tray icon eg:

Code:

<TrayButton label="◑">exec:/usr/bin/mm_brightness_slider</TrayButton>

If I put that line in the "TrayButton" area (eg in the blank space that I left above the "XVKBD" tray button declaration) then that icon will appear on the left hand side of the menu tray, with the icons sitting to the right of the menu button.

If I put that line somewhere in the "swallow" declarations then it will appear in the tray area near the clock

To activate the change all I need to do is:

Code:

jwm -restart

and the icon appears without losing all of my open windows (as would happen with a restart X)

(I am sure Mochi and others will correct my fundamental misunderstandings about this Smile

)

greengeek

Joined: 20 Jul 2010
Posts: 5359
Location: Republic of Novo Zelande

Posted: Wed 10 Oct 2018, 14:36 Post subject:

fabrice_035 wrote:

root# xrandr --output LVDS --set BACKLIGHT 5
X Error of failed request: BadName (named color or font does not exist)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 11 (RRQueryOutputProperty)
Serial number of failed request: 33
Current serial number in output stream: 33
root#

[/code]

Hi Fabrice, can you post the output of the following command please?

Code:

xrandr --verbose | grep Backlight

(must use capital B for Backlight)

fredx181

Joined: 11 Dec 2013
Posts: 3650
Location: holland

Posted: Wed 10 Oct 2018, 15:17 Post subject:

@greengeek

Following MochiMoppel's brightness slider example for adding to ~/.jwmrc:

Code:

<TrayButton label="◑">exec:/usr/bin/mm_brightness_slider</TrayButton>

Then:
For Mike's BrightSelect.sh script, add in ~/.jwmrc

Code:

<TrayButton label="◑">exec:/usr/local/bin/BrightSelect.sh</TrayButton>

Then: "jwm -restart" should do.

But then maybe better remove /root/Startup/ScreenControl.sh
(to avoid displaying the yad icon (will be duplicate), in case you do restart X or reboot with save)

Quote:

xrandr --verbose | grep Backlight

This gives no output for me.

Fred
_________________
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Mike Walsh

Joined: 28 Jun 2014
Posts: 4548
Location: King's Lynn, UK.

Posted: Wed 10 Oct 2018, 15:34 Post subject:

@ Ian:-

Give this one a try. It's identical to the one from last night, with the addition of a 'pinstall.sh' script that places the icon in the tray when you install it.

https://www.datafilehost.com/d/dc10b5c2

Not sure how you'd remove the icon afterwards, though.

Code:

jwm -restart

....doesn't get rid of it for me (and I'm not too sure how a 'puninstall.sh' script works.)

See what ya think. I spoil you, buddy..! Laughing

Mike.

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greengeek

Joined: 20 Jul 2010
Posts: 5359
Location: Republic of Novo Zelande

Posted: Thu 11 Oct 2018, 13:36 Post subject:

Mike Walsh wrote:

Give this one a try....
Not sure how you'd remove the icon afterwards, though.

Not a problem for me - the icon mysteriously disappears after I shut down (that's why I like having no save file) Twisted Evil

Quote:

See what ya think. I spoil you, buddy..! Laughing

Indeed - many thanks for the updated pet. It's perfect for some of my needs. Working as described and yad definitely makes the interface look good Exclamation

HOWEVER - i still feel that adjusting gamma is the wrong approach if backlight control is available. Of course it isn't always available, but on many monitors - even external ones it is available so I feel people should be aware of it.

Here are some threads that offer more information:

https://unix.stackexchange.com/questions/189675/is-there-a-way-to-adjusts-the-brightness-of-the-monitor/189690

https://github.com/jonls/redshift/issues/436
(this thread also mentions "Clight")

and here is the thread re ddccontrol: https://github.com/ddccontrol/ddccontrol

I think each user should inspect the output of xrandr (xrandr --verbose) to see if "BACKLIGHT" or "Backlight" or "backlight" are mentioned anywhere.

In theory, any device that has such a variable noted by xrandr should be able to have its backlight controlled, rather than dimming pixels or altering the colour balance of pixels.

Once you have the info from xrandr regarding the range of backlight values permissible within xrandr then you can script the required values into the correctly spelled "backlight" variable.

(i mention this not as a negative against your pets - but just in case future users are looking for other specific ways to control backlight)

greengeek

Joined: 20 Jul 2010
Posts: 5359
Location: Republic of Novo Zelande

Posted: Fri 12 Oct 2018, 04:30 Post subject:

To find out if you might be able to control backlight intensity rather than controlling pixel attributes try the following command:

Code:

xrandr --verbose | grep -e "ack" -e "ACK"

If it returns numerical values then you do not necessarily need to use pixel control as a method of controlling brightness.

EDIT : Ooops! Corrected typo. The command will work now. Sorry!
Embarassed

gjuhasz

Joined: 29 Sep 2008
Posts: 371

Posted: Mon 12 Nov 2018, 19:40 Post subject: Battery saving brightness control for Intel laptops

Hi,

I found a battery saving brightness control method for my HP laptop (HP 250 G6 with Intel HD 520 graphics).

See details at

http://murga-linux.com/puppy/viewtopic.php?t=96964&start=241

Have fun!

Regards

gjuhasz

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