First time MorphOS user / intermittent blank screen…

[Dragster]

I usually have the same problem with my 24" Monitor under OS 4.1 and MorphOS 2.6...when using a 1920x1200 screen on my Pegasos II.  As far as I know, it's the DVI cable/connection... I think this can be solved by using a DVI-D DUAL LINK cable  instead of a single link one...  it has nothing to do with going low on video memory.

Hope that helps,

Cheers,

Dragster

PD. I read about that somewhere, don't take it as a fact, I haven't tested it myself!

[Dragster]

@Dragster
Using the VRAM monitor I described above, I made some experiments and, when I overloaded the VRAM by opening lots of drawers and applications I noticed a kind of "swapping" effect : when I ran very low of VRAM (typically above 60MB used out of 64), I noticed a short freeze followed with a big flush of the VRAM that went back to around 40MB used, without me doing anything. I concluded from that that, for performances enhancement, MOS keeps a graphic copy of each drawer or application we open into its VRAM, even when masked, but flushes this copy if the original is not visible, when necessary. As a result it has to "rebuild" its layout when the drawer or the application is unmasked.
So yes, the more VRAM you have, the better Though, of course, you could certainly overload 256MB too. But setting my color-depth to 15/16bits kept my medium VRAM use under 40% all the time and I never suffered again from those short freezes that occur during the flushes.

Interesting, but... the issue happens to me with a 128 MB ATI Radeon GFX card and I *never* force it to go below 70 MB of free vram which is still plenty... still the issue happens.

So, yours could be the 2nd reason for the monitor to blank at times...  low vram...  hope the original poster of this thread can find the right fix for his problem and share his experience with us.

I'll try the dual link dvi-d cable thingy sometime...

Cheers,

Dragstrer