Rockbox Development > Feature Ideas

Brightness (While Plugged In)

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Yotto:
I like to leave the backlight on while my RockBoxed iPod is plugged in. I can do this easily with the "Backlight (While Plugged In)" option, turning it to "on"

However, while it's plugged in I don't need the backlight as bright as I keep it normally, and it just eats up (more) battery charge time. So, I was thinking how nice it would be to have a "Brightness (While Plugged In)" option as well, that I could turn down to the lower limits.

Is this feasible?

tomers:

--- Quote from: Yotto on February 13, 2010, 01:19:24 AM ---Is this feasible?

--- End quote ---

I it definitely feasible, but you'll have to convince others that it is really needed. TMHO, a new feature that is added to Rockbox must be relevant for a big enough audience, otherwise it does more harm than good (feature bloat).
I personally not sure it is a useful feature for many people, but that's just my opinion. Let's see what others think :-) Try contacting developers in IRC to discuss this.

mcuelenaere:
Something like FS#10862?

torne:
I was going to post and tell you that the brightness doesn't make that much difference, but I just tested it on my ipodvideo and it's a massive difference, for that model at least.

Player idle, backlight off (but LCD on): ~120mW
Player idle, backlight on minimum: ~165mW
Player idle, backlight on maximum: ~410mW

This actually means that if you charge while in Rockbox, having the backlight on full draws so much power that the battery won't really charge at all (because of the issue where we only draw 100mA from USB).

Having said that it also means that having the backlight up that bright means the battery drains at that rate, so hm.

Yotto:
@tomers: I cannot say if it's feature bloat or not. I obviously would like it but if nobody else sees a use for it, I'm perfectly willing to do without. Same goes for if nobody feels like doing the work to add it. It's not like I'm offering, and my code likely would need fixing because I'm by no means a programmer.

@mcuelenaere: #10862 is for two backlight dimmers that work on their own timers, but function in every area of the firmware. I'm talking a backlight that has a different timer because it's in a different mode (powered instead of battery).

@torne: your quantitative numbers match with my qualitative analysis that led me to want this feature. The battery obviously takes longer to charge when I have the screen on than when it's off.

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