Doublescan 320x240 modeline

[Dave Maxwell <emaxwell@columbus.rr.com>]

Back when I running Mandrake, I had some low resolution modelines defined 
that I used to get nice fullscreen displays of SDL games, XMMS plugins and 
the like.  Now that I'm running Debian, the xserver refuses to utilize these 
modes.  The relevant portions of XFree86Config-4 looks like this:

Section "Modes"
        Identifier   "Modes[0]"
        ModeLine     "320x240" 15.7 320 324 348 388 240 241 244 253 doublescan
        ModeLine     "400x300" 24.2 400 408 448 504 300 302 306 316 doublescan
        ModeLine     "512x384" 39.5 512 524 596 648 384 387 392 404 doublescan
EndSection

Section "Monitor"
        Identifier   "Display 1"
        UseModes     "Modes[0]"
        HorizSync    30.0 - 67.0
        VertRefresh  50.0 - 100.0
EndSection

Section "Device"
        Identifier  "MATROX CARD 1"
        Driver      "mga"
        Option      "AGPMode" "2"
        Option      "DPMS"
        BusID       "PCI:1:0:0"
        Option      "OverclockMem" "on"
EndSection

Section "Screen"
        Identifier "Display 1"
        Device     "MATROX CARD 1"
        Monitor    "Display 1"
        DefaultDepth     16
SubSection "Display"
                Depth     16
                Modes    "1024x768" "800x600" "640x480" "512x384" "400x300" 
"320x240"
        EndSubSection
        SubSection "Display"
                Depth     24
                Modes    "1024x768" "800x600" "640x480" "512x384" "400x300" 
"320x240"
        EndSubSection


This is what XFree86.0.log had to say about my modelines:

(II) MGA(0): Not using mode "320x240" (bad mode clock/interlace/doublescan)
(II) MGA(0): Not using mode "400x300" (bad mode clock/interlace/doublescan)
(II) MGA(0): Not using mode "512x384" (bad mode clock/interlace/doublescan)


In both distros of Linux, I was using XFree86 4.1.0 with a Matrox G400Max 
video adaptor.  Identical monitor scan rates and the like were in both 
XFree86Config-4 files.  Basically, it worked in Mandrake and won't in Debian. 

My partial solution to this problem was to create new modelines for 512x384 
and 400x300 that don't use the doublescan flag. So far, so good the refresh 
rates for the new modes are much better.  However, to get a 320x240 mode that 
is within my monitor's specs I HAVE to use doublescan.  As near as I can 
tell, there was something enabled in the Mandrake xserver that isn't enabled 
in the Debian counterpart.

Does anyone have any idea why the xserver is complaining about this mode?

Thanks,

Dave Maxwell


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