X problems, likely vertical refresh

[Matthew Weier O'Phinney <matthew@weierophinney.net>]

I just installed an ATI All-in-Wonder PCI VGA card in my machine, and
I'm having a few problems with X.

I'm using a Slimline flat-panel LCD monitor, and I have a chart showing
Horizontal frequency and Vertical refresh rates. I've specified the
appropriate ranges in my /etc/X11/XF86Config-4 file. I've also specified
the "ati" driver for my video device. (I've attached the full
XF86Config-4 file below.)

I'm getting some wierd behaviour, though. When I load X, I get a gray
pattern that has vertical dark areas that then gradate out to vertical
lighter areas. Once blackbox has loaded with my backdrop, it's not
noticable ... until you start looking at apps, and start to notice that
wherever there was a dark bar, any text/graphics overlying that area are
darkened and defocussed along those vertical strips. It makes it
difficult to read, to say the least.

I hadn't noticed this behaviour on the same monitor with a different
graphics card (I've tried it with both an S3 Savage and an old NVidia
TNT card), so I'm wondering if it's specific to the ATI card. In
addition, I may have had it working previously with the ATI card -- but
I cannot find any settings that work correctly right now.

The settings available to the monitor are:
Res.        Horiz(KHz)  Vertical(Hz)
640x400     31.47       70
640x400     31.47       70
640x480     31.47       59.9
640x480     37.9        72
640x480     37.86       75
800x600     35.16       56.3
800x600     37.88       60.3
800x600     48.09       72
800x600     46.9        75
1024x768    48.36       60
1024x768    56.48       70.1
1024x768    60          75

/etc/X11/XF86Config-4:
### BEGIN DEBCONF SECTION
# XF86Config-4 (XFree86 server configuration file) generated by dexconf, the
# Debian X Configuration tool, using values from the debconf database.
#
# Edit this file with caution, and see the XF86Config-4 manual page.
# (Type "man XF86Config-4" at the shell prompt.)
#
# If you want your changes to this file preserved by dexconf, only make changes
# before the "### BEGIN DEBCONF SECTION" line above, and/or after the
# "### END DEBCONF SECTION" line below.
#
# To change things within the debconf section, run the command:
#   dpkg-reconfigure xserver-xfree86
# as root.  Also see "How do I add custom sections to a dexconf-generated
# XF86Config or XF86Config-4 file?" in /usr/share/doc/xfree86-common/FAQ.gz.

Section "Files"
	FontPath	"unix/:7100"			# local font server
	# if the local font server has problems, we can fall back on these
	FontPath	"/usr/lib/X11/fonts/misc"
	FontPath	"/usr/lib/X11/fonts/cyrillic"
	FontPath	"/usr/lib/X11/fonts/100dpi/:unscaled"
	FontPath	"/usr/lib/X11/fonts/75dpi/:unscaled"
	FontPath	"/usr/lib/X11/fonts/Type1"
	FontPath	"/usr/lib/X11/fonts/Speedo"
	FontPath	"/usr/lib/X11/fonts/100dpi"
	FontPath	"/usr/lib/X11/fonts/75dpi"
EndSection

Section "Module"
	Load	"GLcore"
	Load	"bitmap"
	Load	"dbe"
	Load	"ddc"
	Load	"dri"
	Load	"extmod"
	Load	"freetype"
	Load	"glx"
	Load	"speedo"
	Load	"type1"
	Load	"vbe"
EndSection

Section "InputDevice"
	Identifier	"Generic Keyboard"
	Driver		"keyboard"
	Option		"CoreKeyboard"
	Option		"XkbRules"	"xfree86"
	Option		"XkbModel"	"pc104"
	Option		"XkbLayout"	"us"
EndSection

Section "InputDevice"
	Identifier	"Configured Mouse"
	Driver		"mouse"
	Option		"CorePointer"
	Option		"Device"		"/dev/input/mice"
	Option		"Protocol"		"ImPS/2"
	Option		"ZAxisMapping"		"4 5"
EndSection

Section "Device"
	Identifier	"ATI Mach64 Rage 3d +DVD"
	Driver		"ati"
	VideoRam	8192
EndSection

Section "Monitor"
	Identifier	"flatpanel"
	HorizSync	30-60
	VertRefresh	50-75
	Option		"DPMS"
EndSection

Section "Screen"
	Identifier	"Default Screen"
	Device		"ATI Mach64 Rage 3d +DVD"
	Monitor		"flatpanel"
	DefaultDepth	16
	SubSection "Display"
		Depth		1
		Modes		"1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		4
		Modes		"1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		8
		Modes		"1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		15
		Modes		"1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		16
		Modes		"1024x768" "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Depth		24
		Modes		"1024x768" "800x600" "640x480"
	EndSubSection
EndSection

Section "ServerLayout"
	Identifier	"Default Layout"
	Screen		"Default Screen"
	InputDevice	"Generic Keyboard"
	InputDevice	"Configured Mouse"
EndSection

Section "DRI"
	Mode	0666
EndSection

### END DEBCONF SECTION

Any help would be greatly appreciated!

-- 
Matthew Weier O'Phinney
matthew@weierophinney.net