I'm running Buster (with Pi-4 options), with an HP2311 23" monitor rated as 1920x1080 60Hz.

The maximum resolution offered is 1024x768. With the Stretch installed, it is quite happy at 1080p.

In both cases, I have to set hdmi_force_hotplug=1 and config_hdmi_boost=4 in the config.txt to get any o/p.

  • Hello and welcome -- Change the config_hdmi_boost=4 to config_hdmi_boost=2 OR config_hdmi_boost=7. What happened?
    – M. Rostami
    Mar 2, 2020 at 18:33
  • You should split the question and the answer. Mar 4, 2020 at 12:41
  • Thanks M. Rostami, I'll try that at the weekend.
    – Fredca
    Mar 6, 2020 at 9:46
  • Dmitry Grigoryev, I originally thought I'd posted the question but one of my Tags had prevented the post so I couldn't answer it and decided to include my solution in the question before posting in case it helped anyone. I do realise that this is the WRONG way to do things but hey life's short at my age!
    – Fredca
    Mar 6, 2020 at 9:50
  • Having set "advanced options -> resolution -> DMT MODE 82 -> Finish " the config_hdmi_boost=4 doesn't matter. I ended up commenting it off.
    – Fredca
    Mar 7, 2020 at 14:38

1 Answer 1


To fix it I ran sudo raspi-config Then:

advanced options -> resolution -> DMT MODE 82 -> Finish

Then I selected:

preferences -> screen settings -> 1920 1080 16:9"

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