Re: problem in screen resolution at 1024*768

[Bill Benedetto <bbenedetto@goodyear.com>]

>>> Rafael Quintanilla writes:

  Rafa> I recently installed debian from a Knoppix 3.3
  Rafa> catalan. The problem is that I want to have a 1024*768
  Rafa> resolution (BTW my monitor is a 15" SyncMaster 551S,
  Rafa> samsung, with a recommeded refresh vertical rate of 85
  Rafa> Hz). I obtain only a 800x600 resolution (see attached
  Rafa> file XF86Config-4_old.txt).

I just had an issue like this as well.  I used the XF86Config-4
file from Knoppix and couldn't get the resolution that I wanted.
In order to get that resolution, my first attempt was to just add
the mode like this:
 OLD:
   Modes "800x600" "640x480"
 NEW:
   Modes "1280x1024" "800x600" "640x480"
but that didn't work.

The REASON it didn't work is that the XF86Config-4 from Knoppix
had all these ModeLine's:
  # These are the DDC-probed settings reported by your monitor.
  # 1152x864, 75.0Hz; hfreq=67.50, vfreq=75.00
  ModeLine "1152x864"	108.00 1152 1216 1344 1600  864  865  868  900 +hsync +vsync
  # 1024x768, 75.0Hz; hfreq=60.02, vfreq=75.03
  ModeLine "1024x768"	 78.75 1024 1040 1136 1312  768  769  772  800 +hsync +vsync
  # 800x600, 75.0Hz; hfreq=46.88, vfreq=75.00
  ModeLine "800x600"	 49.50  800  816  896 1056  600  601  604  625 +hsync +vsync
  etc...
and XFree86 didn't like something about them.

In order to fix it, I just removed all of the ModeLine's and let
XFree86 do its work.

I decided to remove them based on the XFree86-Video-Timings-HOWTO
which said:

   This HOWTO is effectively obsolete. Current (4.0.1 and up) versions of
   XFree86 compute optimal modelines from the resolution you specify in the
   Modes section of your X configuration file.

So I removed the ModeLine's from my XF86Config-4 file and then I
could get 1280x1024 like I wanted.

Note that I *DID* have to have the "1280x1024" in the Modes line
so that XFree86 knew that I wanted to use the resolution....

HTH,

- Bill
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Bill Benedetto     <bbenedetto@goodyear.com>    The Goodyear Tire & Rubber Co.
I don't speak for Goodyear and they don't speak for me.  We're both happy.