I am trying to install MorphOS 3.20 on a Pegasos 2 using a Radeon 9200 SE (128MB) and a portable monitor and MorphOS doesn't seem to allow/detect the resolutions supported by the monitor (1920x1080 is its native resolution):
- when booting from the ISO, the only supported resolution is 640x480x8/16/28bit
- with the "BM" boot parameter, I can select 1024x768 resolution from the early startup menu and it works just fine (but unfortunately, running the Monitors prefs still only shows the 640x480 as supported resolution) so there's no way I can use this resolution when booting without boot menu

The monitor is plugged using DVI > HDMI.

Is there something I can do to make MorphOS use higher resolutions for Ambient?

The resolutions available: https://ibb.co/gbdWXjxF
GraphicsBoard details: https://ibb.co/qF4gKs3J

The serial logs shows these messages about the Radeon:

29.573| Radeon: Failed to initialise Radeon DMA
29.578| Radeon: Failed to allocate CCE DMA memory

[ Edited by Leo 28.06.2026 - 17:43 ]

You should be able to manually set higher bandwidth numbers in monitors prefs and than add better resolutions there.