Screen DPI detected incorrectly by xdpyinfo

[Jan Baier]

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.

[Timo Aaltonen (tjaalton)]

you have four displays connected? looks fine to me

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

[Jan Baier (jan-baier)]

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)]

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

[Matteo Dell'Amico (della)]

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!