Killer BE1750x (BE200) Massive slowdown on battery power

[sivthasan]

Hi everyone,

I bought a new laptop recently (MSI Prestige 13 AI Evo) and it comes with a Killer Wi-Fi 7 BE1750x (BE200) chip inside. The chip connects to my router just fine, signal strength is perfect, and reported "link speed" for the network is almost always 1201/1201Mbps.

When the laptop is plugged in/charging, measured throughput speeds are 750-800Mbps with 1-3ms test server ping on speedtest.net as expected. When the laptop is on battery power, the speeds drop down to <1Mbps, sometimes even <100kbps, and ping goes up to 70-400ms. Even the most basic web pages take ages to load up.

As soon as I plug the laptop charger back in, the speeds quickly climb back up to 750-800Mbps, and everything works perfectly. 

I didn't have this issue on my previous laptop connected to the same Wi-Fi network, which had an Intel AX211 card. The speeds were also lower on battery power, perhaps due to some built-in power saving feature, but nowhere near as poor as this.

I've tried the originally installed Killer Wireless LAN Driver 23.0.5.7, and the latest Driver 23.60.0, but with no luck.

Has anyone encountered this issue before? Any help would be appreciated!

*EDIT* Simple but non-ideal fix. As suspected, the automatic MIMO power saving mode wasn't working properly. So I turned off power saving entirely.

Device Manager -> Network Adapters -> Killer Wi-Fi 7 BE1750w... -> Advanced -> MIMO Power Save Mode -> No SMPS

Hopefully, battery life isn't terribly impacted.

[DhannielM_Intel]

Hi sivthasan,

Thank you for posting on the community.

I would like to confirm if the issue has been fix with your method or do you require an alternative method for this issue?

If you are looking for an alternative solution, how about you doing this troubleshooting steps: Power Management Settings for Intel® Wireless Adapters.

Please let me know what will be the outcome so we can further investigate this situation.

Best regards,

Dhanniel M.

Intel Customer Support Technician

[DhannielM_Intel]

Hi sivthasan,

I hope you had the opportunity to review the information I posted. At your earliest convenience, please let me know so we can determine the best course of action to resolve this matter efficiently.

Best regards,

Dhanniel M.

Intel Customer Support Technician

[DhannielM_Intel]

Hi sivthasan,

Since I haven't heard back from you I will close this thread now. Also, if you need further assistance and inquiries, please submit a new post as this thread will no longer be monitored.

Best regards,

Dhanniel M.

Intel Customer Support Technician