firefox/minefield screen resolution

[darrell pfeifer]

On Fri, Feb 15, 2008 at 7:04 PM, Felix Miata <mrmazda at ij.net> wrote:
> On 2008/02/15 09:46 (GMT-0800) darrell pfeifer apparently typed:
>
>
>  >> darrell pfeifer pisze:
>
>  >> > In today's rawhide firefox/minefield seems to have an incorrect
>  >>  > impression of the screen size.
>
>  >>  > The icons are very large. Any web page I go to I need to zoom out. It
>  >>  > feels like firefox thinks that the screen is 800x600 rather than
>  >>  > 1900x1200.
>
>  >>  > This also happened about a week ago and magically corrected itself.
>
>  >>  > I checked bugzilla for both firefox and nodoka related problems but
>  >>  > don't see anything.
>
>  >>  > Any idea what component might be causing this?
>
>
> > Everything is very big. The navigation buttons, bookmark toolbar
>  > icons, etc are all huge. For any new web page that is opened the
>  > entire content is also huge. Zooming out two or three times gets the
>  > web page down to a decent readable size.
>
>  > I'd say that the problem is with DPI detection for firefox. Not other
>  > applications seem to be affected. The only exception is that gnome
>  > Appearance/Theme/Customize/Icons shows some big/blurry icons for
>  > Crystal SVG and Slick Icons.
>
>  > xdpyinfo says
>
>  > screen #0:
>  >   dimensions:    1920x1200 pixels (300x230 millimeters)
>  >   resolution:    163x133 dots per inch
>
>  You've run into a relatively new Gecko "feature", pixel scaling for high DPI systems. See https://bugzilla.mozilla.org/show_bug.cgi?id=378927 for upstream bugs about this. You can confirm this by visiting  http://mrmazda.no-ip.com/auth/dpi-screen-window.html to see reported DPI and default FF px setting will probably be about half what xdpyinfo and 'xrdb -query | grep dpi' report.
>
>  The crossover point is 144 DPI. As long as your X DPI is below this, FF will behave as you are used to. If your system is really a 163 DPI system, and you don't like the scaling effects, you'll have to reconfigure something so that FF thinks or knows the DPI is less than 144. In about:config you could set layout.css.dpi to 143 as a direct workaround. Also you could set the system's Xft.dpi to less than 144.
>
>  If your system is not really a 163 DPI system, you need to reconfigure X so FF doesn't think that's what it is.
>  --

Thanks for the information, it really helped.

xrdb reports:

Xft.dpi:	120

Setting that value in about:config gives a decent display. If I go
higher (say the 143) then portions of the window on the right and
bottom aren't visible.

I'm assuming that the value from xdpyinfo is probably incorrect,
though I don't know at this point where to look.

darrell