On 2011/09/30 11:00 (GMT+0100) Daniel Drake composed: > I'm working on bringing OLPC up-to-date with all the great efforts > with GNOME 3, systemd, etc.
> On the OLPC XO laptops we have quite a strange screen - it is small > (152mm x 114mm) but very high resolution (1200x900 i.e. 201 dots per > inch). > Previously, on Fedora 14, we had to adjust the default GNOME font > sizes since they didn't look right on the screen (I think they were > too big). Now I'm looking at applying the same set of customisations > to Fedora 16 since the default fonts are uncomfortably small on our > display. > However, I've noticed a fundamental difference in the sizing of fonts > between Fedora 14 and Fedora 16. This is visible with a simple > experiment: > 1. Open gedit > 2. Change document font size to Sans 72 > 3. Write the capital letter "I" and measure the height of the printed > character with a ruler > I do this on two laptops side by side, one running Fedora 14 and the > other running Fedora 16. > On F14 the height of the I character is 1.9cm, and on Fedora 16 it is > 0.9cm. That is quite a difference. > On both laptops, xdpyinfo correctly prints the screen resolution, DPI > and display size, which have not changed. >> From a typographic standpoint, F14 seems to be correct here. As 1pt is > (approx) 1/72 of an inch, size 72 should produce characters of around > 1 inch in size - and 1.9cm (the F14 measurement) is about an inch. > Also, Cantarell seems to play by its own rules. On F16, the "I" in > Cantarell 72 is 0.8cm, not too different from Sans 72, but the > difference between Sans 11 and Cantarell 11 is more significant - at > size 11, Cantarell is tiny. > Can anyone help me understand this behaviour? Sounds to me like your F14 is using correct DPI while your F16 is forced to 96. Does your F14 have /etc/X11/xorg.conf file or a non-empty /etc/X11/xorg.conf.d/? Can you try opening Firefox 3.x with hidden (about:config) pref layout.css.dpi set to 0, and again set to 201, and loading http://fm.no-ip.com/Auth/dpi-screen-window.html to see what DPI it reports? Same in Konqueror? (other/newer browsers lock to 96). -- "The wise are known for their understanding, and pleasant words are persuasive." Proverbs 16:21 (New Living Translation) Team OS/2 ** Reg. Linux User #211409 ** a11y rocks! Felix Miata *** http://fm.no-ip.com/ -- devel mailing list devel@lists.fedoraproject.org https://admin.fedoraproject.org/mailman/listinfo/devel
