I have now gotten OS4 to boot with a 1280x1024 screenmode.
But there must be a bug somewhere because how I did it is not a normal way (I hope)..
Why does Radeon monitor use Picasso96Settings file even
if I have it removed from the tooltypes?
Why doesn't OS4 open up a 800x600 screen mode when I
have explicitly saved this mode with ScreenMode prefs?
What I did was boot the OS4 update 4 CD.
Open Picssso96Mode prefs program.
Edit the 1280x1024 mode so that it worked and fit.
Saved Picasso96Settings to DEVS:.
Did NOT call Picasso96Settings from Radeon tooltype.
Added three modes (800x600, 1024x768 & 1280x1024) to
Radeon monitor tooltype.
Opened Screenmode prefs (while being in 800x600 from the
CD boot). Saved the 800x600 screenmode settings to ENVARC: of my harddisk.
Rebooted.
OS4 works for the first time in 2 months (since I got the new
LCD) for me. But strangely it opens in the fixed 1280x1024
mode I just had made with Picasso96Mode..
What more strange is that once I saved Screenmode prefs
into one of the modes in the Radeon icon everything works
as expected. Now any new mode works directly.
It can't be expected to have this much trouble just from
changing monitor from CRT to LCD?!?
The problem I had was because my CRT prefs was saved
at 1280x960@85, this is not supported by the LCD so I got
a black screen. It doesn't help just to fix the Radeon icon
apparently.. It seems when screenmode.prefs settings can't
be found it chooses one mode in Picasso96Settings.
I thought OS4 would just revert to 800x600@60 when it
can't find a correct setting for the monitor.