Video interference & slow running solved but...

TNWestTex mcforum at
Wed Feb 20 20:26:59 UTC 2008

Frank Cox-2 wrote:
> I seem to have solved a problem and created a new one.
> I got an ATI X1550 video card and set that up to use the DVI output to my
> monitor instead of the analog VGA that I had off of the built-in Intel
> video.
> To my surprise, that seems to have got around the issue of that Intel bios
> bug
> causing the huge slowdown on this computer (see the "s-l-o-w installation"
> thread that I started the other day. I don't need to specify any "mem="
> kernel
> parameter any more; it just works at full speed without any problem.
> In addition, this seems to have solved the problem of the interference
> lines on
> my display -- I haven't seen one so far since I put this card in.
> However...
> I can't manage to get 1680x1050 video resolution.  "Out-of-the-box" I got
> 1400x1050, which looks squashed.  I tried fiddling around with xorg.conf
> by
> specifying the modeline and resolution that I want.  This is what I ended
> up
> with:
> # Xorg configuration created by pyxf86config
> Section "ServerLayout"
> 	Identifier     "Default Layout"
> 	Screen      0  "Screen0" 0 0
> 	InputDevice    "Keyboard0" "CoreKeyboard"
> EndSection
> Section "InputDevice"
> 	Identifier  "Keyboard0"
> 	Driver      "kbd"
> 	Option	    "XkbModel" "pc105"
> 	Option	    "XkbLayout" "us+inet"
> EndSection
> Section "Monitor"
>         Identifier   "Monitor0"
>         VendorName   "Monitor Vendor"
>         ModelName    "Acer 2223W"
>         DisplaySize     474     296
> Modeline "1680x1050" 149 1680 1784 1960 2240 1050 1053 1059 1089
> EndSection
> Section "Device"
> 	Identifier  "Videocard0"
> 	Driver      "vesa"
> EndSection
> Section "Screen"
> 	Identifier "Screen0"
> 	Device     "Videocard0"
> 	Monitor "Monitor0"
> 	DefaultDepth     24
> 	SubSection "Display"
> 		Viewport   0 0
> 		Depth     24
> 	Modes   "1680x1050" "1280x1024"
> 	EndSubSection
> EndSection
> This made it worse because all I get is 1280x1024 using this xorg.conf.  I
> copied what appeared to be the relevant lines from the xorg.conf file that
> I had
> made for Fedora 7 and the Intel video chipset a while back when I first
> got this
> widescreen monitor.  Obviously, I've missed something somewhere.
> I would like to get this going without having to install the proprietary
> driver, if I can.
> So... what can I do now?
> software seems to over ride xorg.conf with what it thinks it has
detected from the queries of the card and monitor.  Modeline no longer seems
to set anything.  Even if xvidtune fixes a display problem, the found
parameters won't hold in xorg.conf.  You can look at xorg.0.log in /var/log
to see what is being detected.  The proprietary drivers do a better job but
Fedora is changing faster than the updates to the drivers.  Rawhide is off
the bleeding edge.  Also it seems that one either has a new card that
doesn't have drivers yet or an older one that has fallen out of the support

Robert McBroom
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