Red Hat Bugzilla – Bug 439007
dpi calculation for multihead setups bad
Last modified: 2014-06-18 05:10:08 EDT
g-s-d seems to calculate the dpi value for my X11 setup incorrectly. I have two
24" screens attached to an RV630, and the configured dpi value is ridiculously
high because apparently the pixel width of the entire virtual screen is divided
by the physical size of just one of the screens. The result is that firefox uses
huge fonts sizes for everything, which is quite annoying and makes it completely
useless. Gtk applications however seem to ignore the X11 dpi value and use the
one configured in the fonts capplet.
The bug here is this FIXME:
/* FIXME: What do we do about physical size?
* As far as this function is concerned, probably just pass the problem up to
* the callers. There, the best possibility might be to pick the sum of
* physical sizes, but the reality is that the physical size of an X screen is
* a meaningless concept in a randr 1.2 world.
timer = g_timer_new ();
g_print ("setting size to %d %d\n", width, height);
rw_screen_set_size (assign->screen, width, height, 300, 230);
I think the right fix is to simply pick a dpi of 96x96 and disregard the
The workaround is this:
xrandr --dpi 96
BTW: is there any reason why the Gtk font setting dpi value (i.e. the one you
can control in the fonts capplet) is independant from the X display dpi value
(i.e. the one you can change with Xrandr)?
Shouldn't the gnome capplet also update the X display dpi value via xrandr and
keep sure they stay in sync?
Changing version to '9' as part of upcoming Fedora 9 GA.
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