I know the question seems very simple at a first glance, but please hear me out before responding. I did my own research, and want to hear your thoughts/opinions. If you don't care, and just want to see what I'm asking, see the points at the end of my post.
The primary reason for me asking this question here is to raise awareness - we all believe that the second our laptop power is in jeapordy, we must hibernate the system... Why?
To start, I am assuming that hibernation is basically dumping the system RAM and process states to the hard-drive, and shutting the computer down (ref). Resuming would simply load the RAM back from the hard drive - a somewhat time consuming process when compared to standby.
Standby is simply putting the system in a low-power state, providing just enough power to keep the RAM from erasing itself (ref).
Now, according to some websites, standby mode in the S3 state consumes next to no power. Even if the consumption was at "worst" (1.8W according to the linked website - which was for a desktop) in standby mode, this is nothing compared to my laptop's ~30W usage on idle (this figure was found by using HWMonitor). From these figures, it can be estimated that my battery will last roughly 17 times as long in this state.
Now, assuming that you have a battery that lasts about two hours, and you set the critical battery level to 3%, you would have 3.6 minutes left on normal consumption, or roughly 1 hour on standby. In most cases, you would have already saved your work if the battery level reached this critical level, regardless. I don't believe that the consumption of a laptop in S3 mode is even near 1.8W, the reason for this being my own test.
I then turned on the machines again, rebooted them (just to drain the battery a little more), and manually placed them into standby. After leaving them overnight, without even plugging them in again, I turned them back on (~12 hours later), to find that all of my data was still there (long enough for me to grab my power cable and save what was on the screen).
Both of these laptops are just over a year old, which isn't too old... But the Compaq battery isn't very good, and lasts usually around 1.5 hours.
- Now, am I safe in assuming that I can completely disable the hibernate mode on my laptop, and just use the standby mode?
- Has anyone done any tests like this in the past?
- Does anyone know advanced, detailed power consumption of desktops/laptops in S3 mode?
- Has anyone else tried something like I did and found similar/different results?
- Are there any disadvantages (or advantages that I'm unaware of) to using standby over hibernate?