Widescreen on Xorg?

[Tom Evans]

On Wed, 2007-04-11 at 16:19 +1000, David Nugent wrote:
> Jay Chandler wrote:
> > Pretty screen, but running in Xorg and GNOME, I'm limited to a 
> > resolution that's rather crap (1280x1024 before it starts shifting 
> > around following the mouse).
> It should "just work" using the defaults. I have no experience with that 
> specific monitor but have have run the earlier series Samsung SyncMaster 
> which are limited to 1280x1024 native resolution (ie not widescreen), 
> but I do run widescreen 1680x1050 on an asus L4 series notebook which 
> 15.4" screen and OEM ATI Mobility 9700.
> 
> > Section "Monitor"
> >        #DisplaySize      470   300     # mm
> >        Identifier   "Monitor0"
> >        VendorName   "SAM"
> >        ModelName    "SyncMaster"
> >        ModeLine     "1680x1050" 119.0 1680 1728 1760 1840 1050 1053 
> > 1059 1080
> > ### Comment all HorizSync and VertSync values to use DDC:
> >        HorizSync    30.0 - 81.0
> >        VertRefresh  56.0 - 75.0
> 
> As a first shot, comment out these two lines and let X determine the 
> valid ranges, incorrect settings are probably causing valid modes to be 
> discarded (discarded modes are logged in /var/log/Xorg.0.log which will 
> be the first place to look when you're trying to resolve problems like 
> this).
> 
> >        Option      "DPMS"
> > EndSection
> > ~
> > And a screen section with no mode settings but a bunch of color depths.
> 
> You can try removing those as well unless you want to use Ctrl-Alt-+/- 
> mode switching, X defaults are fairly sensible these days.
> 
> Hope this helps,
> 
> David
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To get my widescreen philips screen to work, I had to follow the
instructions in the handbook for creating a modeline that worked with my
monitor. You should not need to specify HorizSync or VertRefresh.

FYI here is my conf:

Section "Monitor"
    Identifier "HomeTFTMon"
    ModeLine "1680x1050" 146.0 1680 1784 1960 2240 1050 1053 1059 1089
EndSection

Section "Screen"
    Identifier "HomeTFT"
    Device "Card1"
    Monitor "HomeTFTMon"
    SubSection "Display"
        Depth     32
        Modes "1680x1050"
    EndSubSection
EndSection      

(The entire conf is a little more complex, dual head on a laptop..)

The relevant section of the handbook is 5.4.3.2 'Adding a Widescreen
Flatpanel to the mix' [1].

To get the values for the modeline, check in your /var/log/Xorg.0.log .

This should help you do the trick:
	grep -A 6 'additional Video Mode:' /var/log/Xorg.0.log


Cheers

Tom

[1]
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/x-config.html#AEN6461
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