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Created attachment 479721 [details] Log file showing monitor DPI being detected I have an Acer Aspire One netbook with an ~134DPI monitor. Under Fedora 11, this was correctly detected and reported. With Fedora 14, while the Intel driver initially seems to correctly detect the resolution, it then reports the wrong value. I've attached the Xorg.0.log file, but here are the interesting bits: [ 18.539] (**) intel(0): Display dimensions: (200, 110) mm [ 18.539] (**) intel(0): DPI set to (130, 138) ... [ 18.664] (II) intel(0): Setting screen physical size to 270 x 158 The monitor is 200mm x 110mm, 1024px x 600px, 130DPI x 138DPI. The size 270mm x 158mm is wrong. I've set the DPI in Gnome's font settings to 134, which has fixed the font sizes for a lot of programs, but some are still selecting fonts that are too small (e.g. Epiphany).
Created attachment 479722 [details] Output from xdpyinfo Attaching the output from xdpyinfo showing the wrong display dimensions & DPI.
Just noting here IMHO relevant part of xdpyinfo: jakoubek:~ $ curl -s 'https://bugzilla.redhat.com/attachment.cgi?id=479722'|grep -E '(resolution|dimensions)' dimensions: 1024x600 pixels (270x158 millimeters) resolution: 96x96 dots per inch jakoubek:~ $
Just FYI I have the same problem in Rawhide. $ xrandr Screen 0: minimum 320 x 200, current 1280 x 800, maximum 4096 x 4096 LVDS1 connected 1280x800+0+0 (normal left inverted right x axis y axis) 331mm x 207mm $ xdpyinfo | grep -E '(resolution|dimensions)' dimensions: 1280x800 pixels (337x210 millimeters) resolution: 96x97 dots per inch # cat /var/log/Xorg.0.log | grep DPI [ 227.349] (**) intel(0): DPI set to (98, 96) The values from xrandr are correct and the DPI counted from them is (after rounding) 98x98, so where the other values came from? 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03) 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03) xorg-x11-drv-intel-2.14.0-2.fc15.i686
Oh, and forgot to add, Xorg.0.log reports yet another different dimensions... [ 227.349] (**) intel(0): Display dimensions: (330, 210) mm
The DPI and physical size as reported by xdpyinfo (and, for the most part, the X log) is a lie. They are properties of the X screen, but X screens do not map 1:1 to monitors, thanks to RANDR. So in general you can't trust them, and anything doing font sizing based on them is broken. If you want that you need to look at the EDID block for each RANDR output, and even then you really can't win because what do you do if one output is 60dpi and one is 130dpi. Which is why the server tends to report the screen dpi as 96, and to compute physical size backwards from that and the number of pixels.