[Bug 19232] Can't set some resolutions using 'xrandr -s ' or '--mode' commands

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=19232





--- Comment #14 from Alex Deucher <agd5f at yahoo.com>  2009-01-29 06:07:13 PST ---
(In reply to comment #11)
> > xrandr --output DVI-0 --mode <mode name>
> > Please post your new xorg log and config after remving the monitor and modes
> > sections if you are still having trouble.
> 
> Yes, I am using 'xrandr --output DVI-0 --mode <mode name>' most of the time. I
> stopped using '-s' :-)
> 
> Now my observations are:
> 
>  -checked the EDID info, and found that the MAX supported resolution is
> '1280x1024'. And I can successfully change the resolution upto that.

Good.

> - Any clue why it is showing the extra "1400x1050"? I couldn't set this
> resolution.
> 

The Xserver adds default modes that are within the sync range supported by your
monitor.  That's where the extra modes come from.  In xserver from git, the
default xserver modes should only be added if the edid from your monitor has
the continuous frequency bit set since a lot of LCD monitors don't like
non-edid modes.  Previous xservers always add the default modes.

> - When reduce the 'Virtual 2048 2048' to 'Virtual 1024 1024' i don't get
> '1400x1050' and infact, i get fewer than listed above.

The virtual line in your config limits the size of your framebuffer.  When you
limit the framebuffer to 1024x1024, the xserver culls out modes larger than the
framebuffer.


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