I am running Red Hat 7.2 using a Diamond Fire GL 1000 Pro w/8MB. The
version of XFree86 appears to be 4.1.0, however, XFree86-3DLabs-3.3.6-42
is the installed rpm for the server for my video card.
Anyway, the problem I am having was trying to get the display
mode to 1280x1024 @ 75Hz. I spent many hours trying to figure out
why I could not get a refresh rate of 75Hz. Initially, the
display was at 1280x1024, but at 60Hz, which flickers.
After my investigation, it appears that the glint driver imposes
a maximum pixel clock rate of 110, regardless of the specified
display depth. The only way I could get the glint driver to run
in 1280x1024 @ 75Hz was to set the DacSpeed configuration direction
in my XF86Config file. I faked the 32 depth speed since it appears
the driver is always using that as the maximum instead of the
24 depth speed. Hence I have the following in my config:
Section "Device"
Identifier "3Dlabs Permedia2 (generic)"
Driver "glint"
VideoRam 8192
#Chipset "pm2"
#Option "no_accel"
# Insert Clocks lines here if appropriate
#XXX: Should be first line, but it appears glint driver takes the
# 32 depth as ultimate limit preventing 1280x1024 @ 75 Hz
# display mode. So we fake the 32 depth limit to get desired
# display.
#DacSpeed 230 230 150 110
DacSpeed 230 230 150 135
EndSection
Also, under my monitor section I have:
# 1280x1024 @ 75Hz
Modeline "1280x1024" 135 1280 1296 1440 1688
1024 1025 1028 1066 -HSync -VSync
SIDE NOTE: The default modeline settings provided for a Sony 420GS
appear to be useless (for my case).
The closest to my needs was 1280x1024 @ 76Hz.
Why isn't there a setting for 1280x1024 @ 75Hz? Related
to this, is the difficulting in defining a modeline since no
monitor manual I ever owned gives all the hysnc, vsync, et. al.
specs. I found a VESA calculator on the net to get the above listing.
(I do know the 420GS can handle the modelines provided by default,
but there was no modeline for 1280x1024@75Hz, which seems to be
a common mode for video cards and a mode I know my video card can
handle).
So, now I have 1280x1024@75Hz, however, I get "static" on the display
anytime I move windows around or when other "movement" effects
occur on the display. Is this a known problem with the glint
driver?
Historically, I used to have RH 5.2 on my system running
Accelerated X (and yes, I purchased it) since at the time of installation
it had a working driver for my card. The server had no problems
running 1280x1024 @ 75Hz display mode.
Thanks ahead of time for any feedback,
--ewh
=====
Earl Hood,
[EMAIL PROTECTED]
<http://www.earlhood.com/>
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