How to get greater resolution

[Richard Fish]

On 12/14/05, reader at newsguy.com <reader at newsguy.com> wrote:
> Richard Fish <bigfish at asmallpond.org> writes:
>
> > Take a look at /var/log/Xorg.0.log.  Most likely the higher resolution
> > modes are being rejected, and you can look there to see why.
>
> The longer I look there the more confused I get.  It says it is
> rejecting the higher res due to hsync out of range.  But I can't tell
> what it is using for refresh rate.

The log shows that it is allowing a 1280x1024 at 60Hz, or 1400x1050 at 60Hz,
so this is ok.  Your monitor apparently does not support a higher
refresh rate than this for these modes, assuming your vertical and
horizontal sync settings are accurate.

> Also it says the `radeon' module failed to load.  That sounds kind of
> important eh?

Not at all.  This is because you are trying to initialize DRI/DRM
support, (Module dri) and using the opensource "radeon" driver
provided with x.org.  (The "Driver" line in your xorg.conf should
really say "radeon", not "ati", but x.org is figuring it out)  The
driver is trying to load the radeon kernel driver for DRI/DRM, but
failing.  Probably you need to reconfigure your kernel to add the
radeon DRI/DRM support (it is under char devices).

If you switch to the proprietary ATI drivers, you will be using the
"fglrx" driver in xorg.conf, which in turn will try to load an "fglrx"
kernel module.

But all of this only affects 3D support...it has nothing to do with
resolution or refresh rates.

> Anyone know how to tell exactly what resolution a desktop is under?
> xwininfo only shows the `Virtual' size I've set but not the actual
> resolution the display is in.

xdpyinfo, in the "Screen #0" section.  Example:

...
screen #0:
  print screen:    no
  dimensions:    1680x1050 pixels (403x303 millimeters)
  resolution:    106x88 dots per inch
...

> A snippet from /etc/X11/xorg.conf and the log produced by it follow:
>
> [...]
>
> Section "Screen"
>    Identifier "Screen0"
>    Device     "Card0"
>    Monitor    "Monitor0"
>    DefaultDepth      24
>    SubSection "Display"
>       Viewport   0 0
>       Virtual   2048 1536
>       Depth     24
> #      Modes     "1152x1024" "1280x1024"
> # Modes     "1152x1024" "1280x1024" "1600x1280"
>       Modes     "1024x768" "1280x960" "1280x1024" "1400x1050"

Um, this line means that you will come up in "1024x768".  Try
reversing the order of modes on this line:

       Modes    "1400x1050" "1280x1024" "1024x768"

-Richard
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