Looks like your monitor is reporting its dimensions as:
(II) intel(0): Max H-Image Size [cm]: horiz.: 31 vert.: 23
...
(II) intel(0): clock: 25.2 MHz Image Size: 306 x 230 mm
which is 12" x 9", which calculates out to a 15" diagonal.
I confirmed this via your monitor's manual
(www.p4c.philips.com/files/1/17e4222e82/17e4222e82_dfu_eng.pdf), which
says:
Recommended display area: 12.0" x 9.0" / 306 x 230 mm
So... sounds like Philip's marketing department is rounding up to 17",
but internally coding it a 15" monitor.
So there is no error in gnome-display-properties after all, it seems to
be accurately reporting the dimensions specified by Philips'
engineering. There isn't anything we can do about their marketing
department exaggerating numbers... ;-)
** Changed in: gnome-desktop (Ubuntu)
Status: New => Won't Fix
--
[Hardy] gnome-display-properties shows wrong size
https://bugs.launchpad.net/bugs/210069
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