Screen DPI detected incorrectly by xdpyinfo

Bug #1650192 reported by Jan Baier on 2016-12-15
10
This bug affects 2 people
Affects Status Importance Assigned to Milestone
xorg-server (Ubuntu)
Undecided
Unassigned

Bug Description

xdpyinfo reports wrong resolution

screen #0:
  dimensions: 5120x1024 pixels (1354x270 millimeters)
  resolution: -2147483648x-2147483648 dots per inch

It worked correctly with analog outputs, after switch to digital one, this bug appeared.

Bug #201491 is related.

Jan Baier (jan-baier) wrote :
Jan Baier (jan-baier) wrote :
Jan Baier (jan-baier) wrote :
description: updated
affects: xorg-server (Ubuntu) → xorg-server
Timo Aaltonen (tjaalton) wrote :

you have four displays connected? looks fine to me

if you do not, then it's a kernel bug

affects: xorg-server → xorg-server (Ubuntu)
Changed in xorg-server (Ubuntu):
status: New → Incomplete
Jan Baier (jan-baier) wrote :

Yes, yes I have four 1280x1024 monitors in one row. After I switched all outputs to digital ones (as seen in xrand.log), the resolution reported by xdpyinfo is wrong -- negative. Expected resolution is somewhere around 96 dpi and definitely not -2147483648.

Launchpad Janitor (janitor) wrote :

[Expired for xorg-server (Ubuntu) because there has been no activity for 60 days.]

Changed in xorg-server (Ubuntu):
status: Incomplete → Expired
Matteo Dell'Amico (della) wrote :

I have the same problem (negative reported DPI) when using an Ubuntu 17.10 VMWare guest running Wayland. This triggers a problem that makes it impossible to zoom in Evince (https://bugzilla.gnome.org/show_bug.cgi?id=774567). Apparently, my monitor size is detected as 0mm x 0mm.

I'd be happy to give more information, please let me know if and how I can help! Thanks!

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