Display brightness

This topic contains 16 replies, has 6 voices, and was last updated by  motamas premium 1 month, 2 weeks ago.

Viewing 17 posts - 1 through 17 (of 17 total)
  • 2. January 2017 at 22:52 #25370

    Can we have control of the RPi 7″ touchscreen brightness via Jivelite?

    13. January 2017 at 15:20 #25858

    Hi epkepk,
    Currently, there is no option to change the brightness of the touchdisplay. However, you can select the black screen as a screensaver and have it start after a few seconds to ensure minimal power usage.

    12. February 2017 at 8:03 #26856

    I would also like to see a screen brightness control made available. Exposing that feature would not be difficult as it can be done through a command line argument to the official Raspberry Pi display.

    13. February 2017 at 13:18 #26872

    Dear apakett,

    We will consider to add this feature to your display plugin, but also you can have a look at this source:

    http://raspberrypi.stackexchange.com/questions/46225/adjusting-the-brightness-of-the-official-touchscreen-display

    Best Regards,
    Mohammad Mbydeen

    13. February 2017 at 21:30 #26911

    With Max2Play I do not have direct access to a command line. Adding the command to Squeezelite Command Line Options caused Squeezelite to not start.

    14. February 2017 at 12:58 #26917

    Dear apakett,

    You can apply the commands in the link we sent you using bash ssh session, not in the Squeezelite Command Line, and in order to apply these commands you need to install the following plugin:

    https://www.max2play.com/en/portfolio/plugin-remote-control/

    Best Regards,
    Mohammad Mbydeen

    16. February 2017 at 21:45 #26999

    The remote control installed without incident.

    Following the instructions for changing display brightness I am getting a Permission denied error:

    max2play login: pi
    Password:
    Linux max2play 4.4.47-v7+ #961 SMP Sun Feb 5 20:17:00 GMT 2017 armv7l

    The programs included with the Debian GNU/Linux system are free software;
    the exact distribution terms for each program are described in the
    individual files in /usr/share/doc/*/copyright.

    Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
    permitted by applicable law.
    [email protected]:~ $ echo 128 > /sys/class/backlight/rpi_backlight/brightness
    -bash: /sys/class/backlight/rpi_backlight/brightness: Permission denied

    I tried to login as “root” but that username was not allowed. Using the “sudo” prefix also did not work.

    • This reply was modified 6 months ago by  apakett.
    20. February 2017 at 14:25 #27039

    Hi apakett,

    You can use this command to over come the permission problem, you open the brightness file and write the value between 0-255:

    [email protected]:/sys/class/backlight/rpi_backlight $ sudo nano brightness

    Regards,
    Mohammad

    20. February 2017 at 20:05 #27060

    I was able to change the brightness file but it had no effect on the display. I tried 128 and 64. Is there a way to apply the change? Rebooting the Pi did nothing to the display.

    • This reply was modified 5 months, 3 weeks ago by  apakett.
    21. February 2017 at 12:15 #27078

    Dear apakett,

    Please make sure that you saved the file correctly, there is no need to restart the pi, also make sure that you have the latest version of max2play, which is 2.41

    We have test the brightness on our lab and it works fine, and we are considering to add this functionality to our display plugin.

    Best Regards,
    Mohammad Mbydeen

    21. February 2017 at 16:54 #27094

    I went back into the Brightness file and the new value was there. To save the value I changed the file attribute to R/W. The system is running Max2play 2.41 (released version). The file Actual_brightness shows the value entered.

    My setup consists of Audio Player running Squeezelite, Squeezebox Server, Jivelite, RPi-Display, HiFiBerry, Filesystem, Raspberry Settings, and Remote Control. The hardware is a Raspberry Pi model 3 and a HiFiBerry Digi+ Pro.

    I am interested in reducing the screen saver clock brightness.

    Thanks for your continued help.

    • This reply was modified 5 months, 3 weeks ago by  apakett.
    22. February 2017 at 12:11 #27111

    Dear apakett,

    Unfortunately, we can not provide you a solution now to control the screen saver clock brightness, we think about it and get back to you soon.

    Regards,
    Mohammad Mbydeen

    23. February 2017 at 7:47 #27161

    Thanks for looking into this. It seems to me that controlling brightness belongs in the display software like all other Operating Systems. That is probably beyond the scope of M2P but it would help for them to take the lead.

    23. February 2017 at 12:38 #27165

    Dear apakett,

    You are very welcome, we are always trying to help 🙂

    Regards,
    Mohammad Mbydeen

    15. March 2017 at 22:30 #27765

    I have just found this thread. I would also be happy to get control over the display brightness, especially for the screensaver.

    Thanks,
    a2kwik4u

    20. March 2017 at 12:10 #27799

    Hi a2kwik4u

    We are happy to help, if you have other questions just post it on our forum.

    Regards,
    Mohammad Mbydeen

    2. July 2017 at 11:11 #29776

    As mentioned in the following thread i would prefere as it said here when it is possible to set up the brightness of displays with a controller (maybe 1-100%) to regulate the brightness.
    Maybe it should be possible to set up the brightness in generals behaviour and a special set up for the screensaver.

    I look forward to see a feature like this in future 😀

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