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The Glamo X.Org video driver reports to the Xserver the correct DPI
value based on the display size and resolution. The following formula
can be used to calculate the exact DPI value for a given resolution
(in pixel) and size (in mm):
resolution * 25.4 / size = DPI
Given that the Openmoko Neo FreeRunner (GTA02) touch screen has a size
of 2.84" (43mm x 58mm) and a resolution of 480x640 pixels, the above
formula gives 284x280 DPI values, which are the ones reported by
xdpyinfo and are very similar to the construction value of 285 DPI.
However, some GTK+ applications can not automatically cope with this
value and they show big fonts, because UNIX traditionally has used
lower values, typically 96 DPI, regardless of display size or
resolution. The suggested workaround is to specify your preferred
value in ~/.Xresources:
Xft.dpi: 96
For more information, check the corresponding Debian bug:
http://bugs.debian.org/500626
-- Luca Capello <luca@pca.it>, Mon, 18 May 2009 18:13:16 +0200
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