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On Kubuntu and Xubuntu the brightness of my monitor goes down to zero (i.e. the backlight got switched off).

On Ubuntu this does not happen, the minimux brightness is still with backlight on and sometimes, especially at night, is too bright and painful.

Anyone that has some ideas on why is it and on how to allow Ubuntu to go down to 0?

My hardware configuration

dadexix86
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  • It's not an answer just a work-around: Try redshitf: http://askubuntu.com/a/482596/428369 . if you are on 12.04 f.lux also helps to dim the screen https://justgetflux.com/ – Jand Sep 28 '15 at 17:33
  • Do you know whether it works on Ubuntu? Because it does not show up... And for the brightness (option -b N), it overlaps a grey layer to the screen, it does not change the brightness :( – dadexix86 Sep 28 '15 at 17:38
  • yeah, for me too it did not appear on applications menu, but it works from terminal: redshift & – Jand Sep 28 '15 at 17:39
  • I found the indicator – dadexix86 Sep 28 '15 at 18:17
  • Well, I'm using gnome-fallback. Maybe that's why it does not show up for me. – Jand Sep 28 '15 at 18:24
  • Did you install it? Does it say anything when opened by terminal? – dadexix86 Sep 28 '15 at 18:35
  • Yes, I installed it and worked from terminal. It does not return any message but dimmed the screen. you can kill the process anytime you like by pkill redshift. – Jand Sep 28 '15 at 18:38
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    If you want the icon, you have to launch gtk-redshift :) – dadexix86 Sep 28 '15 at 18:40
  • No new on this anybody? :( – dadexix86 Oct 02 '15 at 09:32
  • What Ubuntu Version are you on? After I upgraded to 15.X my monitor could go to zero brightness, but before it could not. – Robobenklein Nov 15 '15 at 22:50
  • 15.10, but it was the same with older versions since I remember :) – dadexix86 Nov 15 '15 at 22:54
  • @dadexix86, you may try this workaround http://askubuntu.com/questions/632698/screen-brightness some thing like: sudo sh -c "echo '0' >/sys/class/backlight/intel_backlight/brightness" – user.dz Nov 20 '15 at 14:11
  • @Sneetsher That does the same as putting the brightness to 0 in Ubuntu, aka does not switch off the backlight... – dadexix86 Nov 21 '15 at 09:48
  • @dadexix86, another try sudo sh -c "echo -n '4' >/sys/class/backlight/intel_backlight/bl_power" ref: https://www.kernel.org/doc/Documentation/ABI/stable/sysfs-class-backlight – user.dz Nov 21 '15 at 10:18
  • @Sneetsher Nope, also the last does not change anything. BTW, since that is for HAL, I believe that that is why it does not work any more on Ubuntu ;) – dadexix86 Nov 21 '15 at 10:22

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