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Thread: Unable to change screen resolution on Raspberry Pi 3 Model B

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  1. #1
    Join Date
    2016-Aug
    Posts
    1

    Unable to change screen resolution on Raspberry Pi 3 Model B

    When I first boot up its running at 656x416 on my 4K monitor. In the display settings there weren't any other options. I found bits of info on various blog posts and tried to use:

    cvt 1920 1080 60

    which returned

    Modeline "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync

    After that I used xrandr to create a new mode

    xrandr --newmode "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync

    Which returned the error

    xrandr: Failed to get size of gamma for output default

    But I saw some people mention that this error was harmless so I continued. Using xrandr at this point I could see my new mode in the list. I added the mode

    xrandr --addmode default "1920x1080_60.00"

    which gave that same error again. But this time in the screen settings I could see the new resolution option. But when clicking and applying this resolution nothing happened. I then tried to set the size with xrandr

    xrandr -s "1920x1080_60.00"

    and even with sudo I kept getting the same error

    Failed to change the screen configuration!

    I tried to restart after doing this, but after restarting I couldnt see my new mode in xrandr or in the system settings. Does anyone know how to fix this?

  2. #2
    Join Date
    2016-Aug
    Posts
    2
    I also have this issue, did you find a solution?

    Thanks

    David

  3. #3
    Quote Originally Posted by itzdk View Post
    When I first boot up its running at 656x416 on my 4K monitor. In the display settings there weren't any other options. I found bits of info on various blog posts and tried to use:

    cvt 1920 1080 60

    which returned

    Modeline "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync

    After that I used xrandr to create a new mode

    xrandr --newmode "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync

    Which returned the error

    xrandr: Failed to get size of gamma for output default

    But I saw some people mention that this error was harmless so I continued. Using xrandr at this point I could see my new mode in the list. I added the mode

    xrandr --addmode default "1920x1080_60.00"

    which gave that same error again. But this time in the screen settings I could see the new resolution option. But when clicking and applying this resolution nothing happened. I then tried to set the size with xrandr

    xrandr -s "1920x1080_60.00"

    and even with sudo I kept getting the same error

    Failed to change the screen configuration!

    I tried to restart after doing this, but after restarting I couldnt see my new mode in xrandr or in the system settings. Does anyone know how to fix this?
    Try sudo nano /boot/config.txt
    You should be able to change screen resolution and more from there.

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