(sorry for delay in answering, Internet broke at home).
Yes, I have these lines:
$ cat /var/log/Xorg.0.log | grep "Max H-Image"
(II) RADEON(0): Max H-Image Size [cm]: horiz.: 31 vert.: 23
[...]
(II) RADEON(0): Max H-Image Size [cm]: horiz.: 31 vert.: 23
(same line is there 12 times).
I did the math you said:
diagonal D = sqrt(31² + 23²) / 2.54 = sqrt(961 + 529) / 2.54 =
sqrt(1490) / 2.54 = 38.60 /2.54 = 15.19 inches
so you're right, my monitor is 15"!
But it's really a 17" model (or so I believed all these years :-)
No, seriously I was starting to disbelieve Pithagoras, so I directly
measured the screen diagonal with a ruler.
Measuring just the visible image in the tube (there are unused black
borders around it), diagonal is 39,5 cm = 15,55 inches; measuring the
whole of the glass (including those black borders), diagonal is 40,5 cm
= 15,94 inches. So yeah, again 15.something.
I also measured a 15" Phillips 105S CRT monitor to know if it really has
15", and its diagonal (again the whole of the glass) is 35,2 cm = 13,86
inches.
Another 15", a Samsung SyncMaster 550s CRT monitor has a diagonal of
34,7 cm = 13,66 inches.
Hmm, maybe vendors are (were) selling CRT monitor a bit smaller than
what they advertised?
A trick I noticed in all these diagonal values (in inches) is that
truncating them (say turning 15,19 into 15) and adding 2 yields the
(supposedly) correct value (in this case 15 + 2 = 17 inches).
The same seems to work for those 15 inchers: 13.something --> 13, plus 2
= 15 inches.
Don't know if this trick can be useful for showing more-or-less correct
diagonals (at least for CRTs); surely TFT monitors are another world in
this regard.
Sorry for this long comment, just my discoveries
--
gnome-display-properties shows incorrect monitor size
https://bugs.launchpad.net/bugs/211409
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