XFree86 3.3.2 Mach64 noise (Rage Pro AGP card)
I just upgraded to XFree86 3.3.2, hoping that the noise problems
with my ATI Xpert@Work (4MB, AGP) would be fixed. (The noise appears
as a evenly scattered white and black pixels to the left of a window,
whenever its contents is changed/updated.) The problem wasn't gone, but
I found this comment in the Known Problems section of
lib\x11\doc\README.Mach64):
o With high refresh rates on certain cards (VT-A3 and CT-D) noise can
become a problem in 32bpp mode. This usually only happens with
refresh rates of 85Hz or greater and can be fixed by using a lower
refresh rate (e.g., 72Hz or 75Hz).
I decided to try out different display modes, to see if the noise
still appeared. These are the results (Y marks that noise appears,
N no noise, and n/a that I couldn't test the mode due 4MB limit):
Resoultion Hsync/Vsync/pixelclock 8bpp 16bpp 24bpp 32bpp
640x480 44KHz/85Hz /36.00 N N Y Y
800x600 53KHz/84Hz /56.25 N Y Y Y
1024x768 60KHz/75Hz /78.85 N Y Y Y
1280x1024 (not sure) /108.00 Y Y n/a n/a
Seems like it appears even with 16bpps, even with refresh rates less than
75Hz.
I tried the "no_block_write" option, but that made no difference.
There is no noise at all in Windows 95.
Has anyone else experienced anything like this?
Any specific reason why it appears?
Is there a fix or work-around?
Oskar Liljeblad (osk@hem.passagen.se)
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