[gnome-settings-daemon] xrandr: Don't check for hi-dpi on monitors with broken EDID

[Bastien Nocera <hadess src gnome org>]

commit 1356fe5eaf51eecad6c107a3fe1badf2f6eb63f5
Author: Bastien Nocera <hadess hadess net>
Date:   Thu Oct 30 11:26:24 2014 +0100

    xrandr: Don't check for hi-dpi on monitors with broken EDID
    
    If the monitor reports a width/height that looks suspiciously like an
    aspect ratio (16/9 or 16/10) don't check for hi-dpi. We can assume that
    makers of devices that do support hi-dpi aren't so careless.
    
    See http://cgit.freedesktop.org/~daniels/xserver/commit/?h=lodpi
    
    https://bugzilla.gnome.org/show_bug.cgi?id=738748

 plugins/xsettings/gsd-xsettings-manager.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/plugins/xsettings/gsd-xsettings-manager.c b/plugins/xsettings/gsd-xsettings-manager.c
index 4d4698d..489021c 100644
--- a/plugins/xsettings/gsd-xsettings-manager.c
+++ b/plugins/xsettings/gsd-xsettings-manager.c
@@ -599,6 +599,14 @@ get_window_scale (GnomeXSettingsManager *manager)
                 if (height < HIDPI_MIN_HEIGHT)
                         goto out;
 
+                /* Somebody encoded the aspect ratio (16/9 or 16/10)
+                 * instead of the physical size */
+                if ((width_mm == 160 && height_mm == 90) ||
+                    (width_mm == 160 && height_mm == 100) ||
+                    (width_mm == 16 && height_mm == 9) ||
+                    (width_mm == 16 && height_mm == 10))
+                        goto out;
+
                 window_scale = 1;
                 if (width_mm > 0 && height_mm > 0) {
                         dpi_x = (double)width / (width_mm / 25.4);