Please remove the one modeline in /usr/share/xorg/extramodes marked as needed for the SGI 1600SW and add the following ones instead: ModeLine "1600x1024" 103.125 1600 1600 1656 1664 1024 1024 1029 1030 HSkew 7 +Hsync +Vsync ModeLine "1600x1024" 103.125 1600 1600 1656 1664 1024 1024 1029 1030 HSkew 5 +Hsync +Vsync ModeLine "1600x1024" 103.125 1600 1600 1656 1664 1024 1024 1029 1030 HSkew 1 +Hsync +Vsync ModeLine "800x512" 54.375 800 800 840 848 512 512 514 515 HSkew 7 DoubleScan +Hsync +Vsync ModeLine "800x512" 54.375 800 800 840 848 512 512 514 515 HSkew 5 DoubleScan +Hsync +Vsync ModeLine "800x512" 54.375 800 800 840 848 512 512 514 515 HSkew 1 DoubleScan +Hsync +Vsync These are required for proper function of this display, in combination with changes to pyxf86config and rhpxl. The source for these modelines is: http://ftp.x.org/pub/X11R7.0/doc/html/I1284.html#4
It is the extramodes file in the raw source that needs patching, as the /usr/share/xorg/extramodes is a read-only file which is present only so the config tools know what video modes the X server was compiled with. ie: if you edit the file, it wont do anything at runtime. ;)
This might be a dup of 115679.
No, this is one of the things that needs to be done so 115679 can be closed. There's several parts to this problem and this bug is just so the X people know what part they need to deal with.
Adjusted the extra mode we ship in 1.0.1-8