| Re: Graphics problem on Sun Ultra2 workstation [message #36169 is a reply to message #35855] |
Thu, 14 August 2003 07:05  |
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Wonko[3]
Messages: 9
Registered: February 2003
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Junior Member |
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timm.weitkamp@nowhere.edu (Timm Weitkamp) writes:
> Alex and Jim,
> I have little knowledge about the hardware internals of computer
> graphics, but I have seen the phenomenon described by Alex lots of times
> on different kinds workstations (HP, Sun...). It occurs not only with
> IDL.
> I am pretty sure that this is simply the way that their 8-bit visuals
> deal with any application's attempt to allocate a larger number of colors
> than is left free by the other applications (including the window
> manager). In this case, the application gets a "private colormap", and
> every time the focus is put in the application's window, the entire
> screen switches to this colormap, inevitably messing up the rest of the
> screen. In other words: it's a feature, not a bug.
> I'd be surprised if it had anything to do with the refreshing rate.
> Alex, your Sun probably has Netscape installed, right? Try start it by
Sort of, but the times whan I used SUNs to view Web sites are over, I
prefer PCs for that now. Netscape is painfully slow, and crashes way
too often. Mozilla is okay, but even slower.
I used to do the -install trick with Netscape some years ago, but my
problem happens without any color-using applications. There is just
OpenWindows running. I also tried CDE, even in black-white mode, but
this dows not change the color flashing problem.
When I start Netscape, I can see true-color images. Using xcolor to
display the colormap, I see no change here. I can also open another
applicaton, using ~200 colors, without color flickering. But I can see
the color map changing then.
There are a couple of SUNs here I am working with. Sparc5 machines,
sparc10, and some Ultras. But only this Ultra-2 machines gives the
problems. With all other machines I can prevent the flickering (if it
happens at all) by doing a DEVICE, PSEUDO=8 or DEVICE, DECOMPOSED=0
before opening any graphics window.
But looking at the output of xdpyinfo, I just noted that the default
visual ID is 0x20, and this means PseudoColor. Although there are a
couple of TrueColor visuals. But this may be normal, I see a similar
output on another Sun.
Oh, well. This is our biggest Sun, but I don't use it, because IDL
(unless in read TrueColor mode) is no fun here.
Alex
--
Alex Schuster Wonko@wonkology.org PGP Key available
alex@pet.mpin-koeln.mpg.de
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