firefox/minefield screen resolution

[Felix Miata]

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.
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