Thinkpads Forum

Hi all,
I have a T420 (4180-CM1). Specs:

• Windows 8.1 Pro (64 bit)
• i5 2520M 2.5GHz
• Crucial M500 mSata 240GB SSD Boot Drive
• Seagate ST320LT007-9ZV142 Storage Drive
• 8GB RAM

I have two problems:

1. When the PC is in suspend mode, the battery continues to drain. It loses about 40% charge over half a day whilst in suspend mode.
2. The screen seems to have some sort of active dimming, where if what is displayed on screen is of a dark colour, the screen dims and if it's whiter then the screen brightens.
   I'd like to disable this, it's fairly annoying. I've tried, Power Options>Change plan settings>Change advanced power settings>Display>Enable adaptive brightness>Off but this hasn't helped.

Can anyone help me understand why my battery drains so much whilst suspended and help with the screen brightness issue?

Many thanks in advance.

Hi,
Sorry to bump this, but would anyone have any ideas on the above? Or perhaps point me toward a different forum if this is not the appropriate one for my issues?
Thank you.

Some more information is required:

- How fast does your battery drain whilst using the notebook?
- What kind of memory are you using? The thing that drains battery the fastest should usually be the memory. Are they low Voltage variants or normal ones (sometimes named DDR3L)? (I am not even sure if the notebook will even run with non-low voltage memory)

- Maybe there is something else wrong, are you sure the notebook is going into suspend? Maybe only the screen turns off but it's actually still running? You might not notice if you only have solid state storage (and not even necessarily with a harddrive that spins down)... There you should try some CPU power-mode statistics tools, and it will depend on your operating system what to use for these diagnostics...

- Is your system 100% updated?