Latitude E6400 Owner's Lounge

Like I said, you have to take into account the inefficiency of the power adaptor. I was saying it was drawing 11W measured with the adaptor. If the adaptor uses 1W, then the E6400 only draws 10W. And I also said that I have not tweaked things much.

If one can run the intel graphics at 8W, that's over 10 hours. At the 11W that you are drawing, it runs less than 8 hours.

 

Who's calculating wrong? That 10W is the total laptop consumption. No one said the GPU consumes 10W.

 

Please, nobody suggested that. Another helpful poster (John Ratsey) told him to set that option in BIOS, so that USB devices can be charged when the computer is turned off or in standby. That is the correct answer, but the OP went into DEVCICE MANAGER and started turning things off.

 

I know no one did, here. I was wondering if he listen to someone else, and starting doing his own thing and then end up in with a pickle (not the kind that you eat).

 

So what is the correct way to do it in the BIOS setting? please advise.
also look at the past post I put asking about the settings for when running on batter settings..

 

... I asked about the GPU. How is the laptop only consuming at 10w. Sure it runs that at idle and low settings... Giving me a headache trying to explain.

 

You were asking how much more watts the Nvidia graphics use over the Intel graphics. We have been telling you the wattage of systems using those two different graphics chips. The difference is due to the graphics cards.

You were also asking how much battery life difference there is. Of course, you need to know the power consumptions to calculate battery life differences.

You're right though, all these numbers probably give you a headache...

 

I said, "You are calculating it wrong though. The GPU doesn't draw 10w the whole time. There is still the processor, the screen, etc."

You replied, "Who's calculating wrong? That 10W is the total laptop consumption. No one said the GPU consumes 10W."

You responded previously to my statement about the differences of watts between the two GPUs, not the whole system. So was I wrong to assume you were actually trying to answer my question about GPU?

 

If you have two systems that are the same except for the GPU's, doesn't it make sense to assume that difference in the laptops' power consumption is due to a large extent to the difference in power consumptions of the two GPU's?

And more to the point, you were asking about the difference in battery life!

 

It depends if you want the absoulte or percent difference. The percent difference relies on the original values, which will be hard to extrapolate with the data he gave. However, you can measure the absolute difference in watts between the two GPUS. It is the difference in watts between the two systems, all things remaining the same.

Of course, you also need to take into account the power saving features and whether you want to measure in terms of full load, tpd, or "typical" use. The bottom line is that your question was not specific enough. If you just wanted the TPDs, say so.