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Thread: DPMS appears not to work on Raspberry Pi 4B (Xubuntu, 19.10)

  1. November 15th, 2019 #1
    steveb-uuser
    steveb-uuser is offline First Cup of Ubuntu
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    DPMS appears not to work on Raspberry Pi 4B (Xubuntu, 19.10)

    It appears DPMS does not work with Xubuntu (19.10) on Raspberry Pi 4B.

    The screen blanks but the HDMI monitor back light is still on (e.g. when the screen saver blanks or log out after DPMS configured)
    Code:
    xset dpms force off
    does blank the screen but the backlight is still on.

    This was a firmware issue but
    Code:
    tvservice -o
    does switch off the hdmi and the back light goes off.
    (Background info: I think this was fixed in Raspbian).

    Any clues?

    xset -q shows DPMS Enabled
    Kernel: aarch64 Linux 5-3-0-1012-raspi2
    Nothing reported in /var/log/Xorg.0.log with xset dpms force off

    Possibly related to the kernel or libxcb-dpms0 package?
    Last edited by steveb-uuser; November 15th, 2019 at 02:28 PM. Reason: Added more information.
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