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Old 08-25-03, 06:40 AM   #1
markuslaker
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Join Date: Aug 2003
Posts: 3
Default G4, Mandrake 9.1: Wobbly, rippling image at high res

I'm running a GeForce 4 on a fully patched Mandrake 9.1 machine. At low resolutions (up to 800x600), the picture is flicker-free and rock-solid. At 1024x768, there are noticeable horizontal ripples. At 1152x864 and above, the rippling is worse, the refresh rate is so low that it's seriously uncomfortable to work with.

How can I get a stable picture and high refresh rate at 1280x1024?

My XF86Config-4 is shown below; I've attached my XFree86.0.log.

Thanks,

Markus


# File generated by XFdrake.

# ************************************************** ********************
# Refer to the XF86Config man page for details about the format of
# this file.
# ************************************************** ********************

Section "Files"
# Multiple FontPath entries are allowed (they are concatenated together)
# By default, Mandrake 6.0 and later now use a font server independent of
# the X server to render fonts.
FontPath "unix/:-1"
EndSection

Section "ServerFlags"
#DontZap # disable <Crtl><Alt><BS> (server abort)
AllowMouseOpenFail # allows the server to start up even if the mouse doesn't work
#DontZoom # disable <Crtl><Alt><KP_+>/<KP_-> (resolution switching)
EndSection

Section "Module"
Load "dbe" # Double-Buffering Extension
Load "v4l" # Video for Linux
Load "extmod"
Load "type1"
Load "freetype"
Load "/usr/X11R6/lib/modules/extensions/libglx.so"
EndSection

Section "InputDevice"
Identifier "Keyboard1"
Driver "Keyboard"
Option "XkbModel" "pc105"
Option "XkbLayout" "gb"
Option "XkbCompat" ""
Option "XkbOptions" ""
EndSection

Section "InputDevice"
Identifier "Mouse1"
Driver "mouse"

# Option "Protocol" "MouseManPlusPS/2"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/psaux"
Option "ZAxisMapping" "4 5"
EndSection

Section "Monitor"
Identifier "monitor1"
VendorName "Generic"
ModelName "1280x1024 @ 74 Hz"
HorizSync 31.5-79.0
VertRefresh 50-90

# Sony Vaio C1(X,XS,VE,VN)?
# 1024x480 @ 85.6 Hz, 48 kHz hsync
ModeLine "1024x480" 65.00 1024 1032 1176 1344 480 488 494 563 -hsync -vsync

# TV fullscreen mode or DVD fullscreen output.
# 768x576 @ 79 Hz, 50 kHz hsync
ModeLine "768x576" 50.00 768 832 846 1000 576 590 595 630

# 768x576 @ 100 Hz, 61.6 kHz hsync
ModeLine "768x576" 63.07 768 800 960 1024 576 578 590 616
EndSection

Section "Device"
Identifier "device1"
BoardName "NVIDIA GeForce4 (generic)"
Driver "nvidia"
Option "DPMS"
Option "NoLogo" "on"
EndSection

Section "Screen"
Identifier "screen1"
Device "device1"
Monitor "monitor1"
DefaultColorDepth 24

Subsection "Display"
Depth 8
Modes "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
EndSubsection

Subsection "Display"
Depth 15
Modes "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
EndSubsection

Subsection "Display"
Depth 16
Modes "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
EndSubsection

Subsection "Display"
Depth 24
Modes "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
EndSubsection
EndSection

Section "ServerLayout"
Identifier "layout1"
InputDevice "Keyboard1" "CoreKeyboard"
InputDevice "Mouse1" "CorePointer"
Screen "screen1"
EndSection
Attached Files
File Type: log xfree86.0.log (27 Bytes, 92 views)
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Old 08-26-03, 01:48 AM   #2
eliu
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Your xf86config is 1280x1024@74
Did you try 76Hz and above ? You can do it in mandrake control center.
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Old 08-26-03, 03:51 PM   #3
markuslaker
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Eliu wrote:

Quote:
Your xf86config is 1280x1024@74
Did you try 76Hz and above ? You can do it in mandrake control center.
When I set the frequency to anything above 74Hz, the picture blanks out.

[Time passes]

In the last few minutes, I've found the problem. XF86Config-4 stated that the monitor supports a 79kHz refresh rate, but a Web search reveals that it supports only 72kHz. That meant the monitor was being driven outside its spec, which is why the image was so unstable.

The same Web search shows that the monitor only supports a 60Hz vertical refresh rate at 1280x1024. That's what I'm getting now. So it looks as if I ought to have spent a few quid extra when I bought my monitor. Next time, I'll know better.

Cheers,

Markus
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