On 2021年11月26日 0:50:28 JST, Linus Walleij <linus.walleij@xxxxxxxxxx> wrote: >On Wed, Nov 24, 2021 at 6:42 AM Hector Martin <marcan@xxxxxxxxx> wrote: > >> Pulling down an I2C bus between transactions is not legal; the idle >> state has to be high. > >Oh right. > >> Apple are actually not very good at configuring GPIOs for power saving; >> e.g. the I/Os for that unused i2c bus still have their input buffers >> turned on, which is a waste of power. If they wanted to save the >> smallest drop of power they'd turn that off. But the effect of this is >> so trivial it probably makes no difference in the context of a laptop, >> nevermind a desktop like the Mac Mini. > >Hm that's true. The saying is that 99% is the backlight, the remaining 1% isn't >so significant after that. >From watching a USB power meter plugged into the MacBook Air, I can say the backlight is about 70% :-) Then again, the new MBPs have LED matrix backlit screens... so suddenly dark themes are more efficient again! I should measure that one, see how much power changing themes saves. -- Hector Martin "marcan" (marcan@xxxxxxxxx) Public key: https://mrcn.st/pub
