@PR1
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The story: Bought an expensive DVI-cable in the hope that the Radeon9250 output would give a better picture from the ViewSonic monitor in this XE. This has been discussed in aw.net but I hope there is the wisdom here to tell that it does/does'nt work when the os4 should pop up.
No, the Radeon driver included in OS4 Final didn't support DVI yet. Only OS4 beta testers have a newer version with DVI support, but AFAIK it doesn't work with all cards yet.
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No signal just comes out in the digital output but U-Boot can be seen in every different cabling(vga or not) setups.
U-Boot includes a x86 emulator, it executes the BIOS of the gfx card which sets up all outputs. AmigaOS4 doesn't use U-Boot and it has no x86 emulator either, the AmigaOS4 drivers have to support it themself.