Disappointing battery life on 13 Ryzen 7640U


Loving my new laptop so far, except for one aspect: Battery life.

I started with Ubuntu 20.04 and was impressed with the smooth install and hardware support (finger print reader was a bit tricky).

However noticed battery life was pretty bad (4 hours), and high standby battery usage - read that this laptop is capable of 12 hours.

So bit the bullet and installed windows 11 enterprise, again very smooth experience with driver packs etc… but disappointed again that battery life was 4-5 hours, similar to ubuntu.

Any idea how to unleash the battery capability?

Specs: 64G Kingston RAM, 2TB nvme BIOS 3.03

Cards: 1xhdmi 1xusb-a 2xusb-c



There are several things that you can do.


  • Make sure USB-C cards are in the back 2 ports

Windows Settings:

  • Set power setting to best battery life
  • Lower screen brightness (I usually have it at 20-30% and I get 8-10 hours on my Ryzen 7 board)
  • If your SSD has a power saving mode, activate it in the manufacturer’s software
  • Update to latest drivers directly from AMD
  • Uninstall unneeded apps
  • Turnoff unneeded services in System Configuration

Power Plan Settings

  • Set minimum processor state to 1%
  • Set PCIE Link State Power Management to Maximum Power Savings
  • Turn on USB selective suspend setting
  • Set USB3 Link State Power Management to Maximum Power Savings
  • Turn off Network connectivity in standby

You can also use O and O Shutup 10 to disable hidden services. Do note that since the Ryzen 5 version has a 55 watthour battery instead of a 61 watthour battery, you may still not get the same battery life as some reviews suggest.


Personally on NixOs with xfce (for now – trying to find something else very small and lightweight but modern), only usb-c when not having a special need, been getting 7-8ish hours of active use spread over 5-6 days. Screen goes to lowest brightness a minute in, it’s only on second lowest usually. The idea is the less stuff there is on the system the less stuff runs, LOVING NixOs for that, being able to just temporarily install a thing I need has been great for that.
(Note I do stay in the terminal most of the time though so that also plays a factor since the screen is primarily very dark)

A data point - I’m getting 6-7 hours on Win11 with the 7840U mostly using Firefox, Brave, Slack & Jupyter. Original smaller battery with USB-C at the back ports, SSD and USB-A front ports.

Have you fiddled with the windows power plans at all, battery saver on?

I’ve been getting varying battery life results on Fedora 39. I’ve just recently installed auto-cpufreq to see if that will increase the battery life a bit, or at least limit excessive heat that my system usually creates. So far I’ve not noticed a big difference, other than that my fans spin less. (I’m thinking I should go in and tweak the settings to make it more intense). So I am still on the hunt for trying to increase my battery life for my current workflow.

It goes without saying, but it depends on what tasks you are doing. For example:

  • As I am tying this in Firefox, my system is on 92%, projecting another 8hrs of battery via Gnome settings.
  • I just watched a ~10m YT video, my battery dropped to 89%, and it is projecting 5 1/2 hrs of battery via Gnome settings.

System info: FW-13 AMD Ryzen 5 7640U, Fedora Linux 39 Kernel 6.5.6-300, 2xusb-c (rear), 1xusb-a, 1xdp.

I have also the 7640U, but with 8Gb RAM, 1x usb C (left back), 1x HDMI (right back), 2x usb A (front positions), and on Windows 11 with the BIOS 3.03. I also have the 55Wh battery.
My usage is light: spotify, netflix, browser, the classic…

My battery life is very good, I would say worst case 8 hours, best 14 hours.
Since you have had your bad battery experience on both Windows and Linux, I would say you have either a material or BIOS issue? Or maybe your usage? (64G of RAM: CFD or CAD?)

Well, for good battery life you need a newer version of Ubuntu. Why not using the official 22.04 version and follow the post-install instructions?

How on earth are you getting this on Windows!? Incredible.

Well according to Windows, should we trust those guys? :rofl:
More seriously, my usage is light as mentioned, I just meant that I did not have the very low battery like in the OP.

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