Re: Identifying monitors

[zahlenmeer gmx de]

On 02/09/17 18:23, Norbert de Jonge wrote:
> > I save preferences per monitor
>
> I think giving us more context might be useful. What kind of things do
> you save per monitor, and why? These are not things you could recreate
> by scaling and positioning based on detected monitor dimensions?

The saved settings are mostly for aesthetics. Monitor background,
slideshow preferences. So the monitor geometry does not affect what I do.

> If we're assuming monitors can be arbitrarily plugged in and out, and
> detection is unreliable or users may even have unidentifiable monitors,
> no function will ever help you. If this is not a cross-platform
> application and you _really_ need to recognize monitors, your program
> could make a system call to "xrandr --prop" and compare EDID strings.

The application already works with gtk2 where it uses
gdk_screen_get_monitor_plug_name and the index in
gdk_screen_get_n_monitors. It works ok but I was hoping to get rid of
the last corner cases with the new API. However, if there is no
straightforward way to achieve this, then this is a limitation I have to
live with.
Are there any statistics how many monitors do not have a model returned
by gdk?

> If you have a broad range of users, all GTK+ 3.22 and newer functions,
> including both gdk_monitor_get_model() and gdk_display_get_monitor(),
> may be problematic. 

3.22 is the target. There is an old version of the application running
with gtk2 that those distributions can ship.