Provide longer options for automatically switching off screen

[Matthew Exon]

At the moment the options for automatically turning off the screen are 1, 2, 3, 4, 5 and 10 minutes. Due to Bug #1512211 I would like to have some longer options, for example 30 minutes.

I freely admit that my use cases are pretty obscure :-) I would prefer the things discussed in Bug #1512211 to be implemented. But anyway, here goes...

* I'm cooking a meal using a receipe on the web. My hand are dirty and I don't want to manipulate my phone, I just want it sitting there for reference. Irritatingly, just as I need to find out how much salt I'm supposed to add, it switches off.

* I'm trying to get a GPS signal while on a sleeper train, which is awkward because I'm on the top bunk and the only place to put my phone is the table below, and the window isn't a great way to get GPS reception. I expect it'll take about 20 minutes. I want to be able to look down and see my phone, and collect it when and only when it has got a fix.

* I'm debugging a problem on my website and I have a bug report in an IM on my phone. The bug report contains a number of unique identifiers I have to constantly search for. I'd like my phone to just sit there for about 20 minutes while I figure out the problem. Having to nudge my phone every 10 minutes is distracting.

[Pat McGowan (pat-mcgowan)]

Is there a reason you prefer not to set it to "never" temporarily during these use cases?

[Matthew Exon (ubuntubugs-mexon)]

Yes: I don't trust myself to set it back. Especially in the "debugging" example, where I tend to forget stuff. I might waste a lot of power that way but I won't end up with a dead phone.

Not that this is a zero-sum game, but... I am genuinely curious to see the real-life use case for 4 minutes, in which 3 and 5 minutes were found to not be satisfactory substitutes. ;-)

[Jean-Baptiste Lallement (jibel)]

I agree with Matthew that there is not much difference between 3, 4 and 5. Then there is nothing between 10 and never while for example acquiring a GPS fix takes up to 20 minutes with an app running in foreground.

We could use a scale like:
- immediate : 15s or 30s
- short: 1 min, 2 min
- medium: 5, min, 10 min
- long: 30 min, maybe 60 min
- Never.