Christos Zoulas wrote:
> In article <20050104215942.C4FE43BFF1C@berkshire.machshav.com>,
> Steven M. Bellovin <smb@cs.columbia.edu> wrote:
> 
>>I'm having trouble trying to configure X on a new Dell 8400 with a flat 
>>panel display.  I ran X -configure; it mostly got things right, but 
>>doesn't seem able to figure out the 1600x1200 resolution that the 
>>adapter, the screen, and -- "the OS shipped with the box" -- can all 
>>handle.
>>
>>I've put the Xlog at http://www.machshav.com/~smb/Xlog; I think the 
>>problem is that 1600x1200 is described as a "future mode".  I assume I 
>>need a Modes section; what I don't know is what all the mystical 
>>numbers should be.  I mean -- I don't even know what a DotClock or an 
>>hdisp are, let alone what values I should supply....
>>
> 
> 
> ModeLine "1600x1200" ?? 1600 1664 1856 2160 1200 1201 1204 1250 +hsync +vsync
> 
> Where ?? is the refresh rate supported by your flat panel. Probably something
> like 60-80. You can use xvidtune to make this better once it works.

One can use the 'gtf' command (part of XFree86) to generate VESA 
compatible modes, for instance:

     gtf 1600 1200 60

But this is useless with the vesa driver.
-- 
					Matthieu