Bug 102669 - display physical dimensions (& DPI) inaccurate (as reported by xdyinfo from macports)
Summary: display physical dimensions (& DPI) inaccurate (as reported by xdyinfo from m...
Alias: None
Product: XQuartz
Classification: Unclassified
Component: New Bugs (show other bugs)
Version: 2.7.11 (xserver-1.18.4)
Hardware: Other All
: medium normal
Assignee: Jeremy Huddleston Sequoia
QA Contact: Jeremy Huddleston Sequoia
Depends on:
Reported: 2017-09-12 05:01 UTC by sto
Modified: 2019-05-23 18:32 UTC (History)
0 users

See Also:
i915 platform:
i915 features:


Description sto 2017-09-12 05:01:40 UTC
XQuartz 2.7.11 on macOS Sierra 10.12.6, using  27-inch Apple LED Cinema display, with resolution set to 2048x1152.

using a browser I visit https://www.sven.de/dpi/ and enter diagonal=27 to get reasonable physical dimensions of the screen:

23.53" x 13.24" = 311.5in^2 (59.77cm x 33.62cm = 2009.68cm^2) at 87.03 PPI, 0.2919mm dot pitch, 7574 PPI^2

But using xdpyinfo (from macports) it reports:

  dimensions:    2048x1152 pixels (541x303 millimeters)
  resolution:    96x97 dots per inch

The pixels are correct, but the millimeters are too small: so DPI is too high.
The millimeters should be: 598x336.
Comment 1 GitLab Migration User 2019-05-23 18:32:08 UTC
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.

You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/xorg/xserver/issues/793.

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.