[iforgotpassword]

Actually traditional tft displays need to apply a current to turn a pixel black, so if you don't use adaptive brightness that would dim the backlight if the display is mostly black, you actually consume more power with a black theme. I have a low power Pentium notebook with 15" led backlit screen and the difference between a terminal with black or white background is significant.

[clarry]

> I have a low power Pentium notebook with 15" led backlit screen and the difference between a terminal with black or white background is significant.

How significant? Turn the screen black, and show the remaining battery time estimate. Turn it white, do the same. I'm curious.

[iforgotpassword]

Battery at 74%. Sitting at black screen for about a minute, the highest estimate I got was 4:50, lowest 4:05. It was mostly showing numbers close to either of these, almost never something in between.

Switching to white I got 5:40 and 4:50 showing pretty much the same behavior.

It's an HP pavilion 15-p005ng with a Pentium N3530. Terrible machine btw. Linux freezes in irregular intervals, almost immediately with OpenGL stuff...

[firethief]

Surely it isn't extrapolating from current instantaneous power consumption?

[camgunz]

I'm pretty sure that's how it works. The drivers report total battery capacity, current battery capacity, and current power draw, so the meters just do the math.