Bug#610043: xorg: Incorrect screen size and resolution
> > Package: xorg
> > Severity: important
> > On Dell 710m laptop with 1280x800 screen, X only produces 1024x768.
> > Screen should be 96x96 dpi, but instead is ~120x100. Problem exists
> > on standard Squeeze install. Upgrading to packages in experimental
> > does not help.
> > Xorg.0.log is included below.
> You're using the vesa driver. Why?
If I understand the modern operation of xorg correctly, user
configuration is not expected; it's supposed to configure itself. The
log shows the result of its self-configuration. I don't know why it
chose the vesa driver, but if it's not the right one, that would seem to
be a bug.