Battery Charge Limit does not work correctly on Lenovo Legion Go S running SteamOS

Your system information

• Device: Lenovo Legion Go S
• Steam client version (build number or date): Latest Steam Client update (July 27, 2026)
• Distribution: SteamOS 3.8.16 (Build 20260716.1)
• Opted into Steam client beta?: No
• Have you checked for system updates?: Yes
• GPU: AMD Ryzen Z2 Go (Integrated AMD Radeon Graphics)

Please describe your issue in as much detail as possible

First of all, thank you for the latest SteamOS update.

The improvements to Performance Mode, Balance Mode, and Low Power Mode are excellent. The system feels much smoother, more stable, and I rarely experience stuttering anymore. I really appreciate the work the SteamOS team has done.

However, I am still experiencing a battery charging issue on my Lenovo Legion Go S.

The Battery Charge Limit feature does not always work correctly. Even when the charging limit is set (for example, 80%), the device sometimes continues charging beyond the configured limit. In addition, the battery percentage occasionally behaves unexpectedly while charging.

This issue has occurred multiple times since updating to SteamOS 3.8.16 (Build 20260716.1). The issue is intermittent and cannot be reproduced every time, but it has happened multiple times since the update. Since battery health is very important for handheld gaming devices, I hope this issue can be investigated and fixed in a future SteamOS update.

Thank you for your continued hard work and support.

Steps for reproducing this issue

1. Enable Battery Charge Limit (for example, 80%).
2. Connect the charger.
3. Leave the device connected to the charger.
4. Occasionally, the battery continues charging beyond the configured charge limit.
5. The battery percentage may also behave unexpectedly while charging.

Expected behavior

The battery should stop charging once it reaches the configured charge limit, and the battery percentage should remain accurate and stable.

Actual behavior

The device occasionally ignores the configured Battery Charge Limit and continues charging past the configured limit. The battery percentage may also behave unexpectedly during charging.

The issue names no files, tests, or entry points. Start by reproducing the charge-limit behavior on the Lenovo Legion Go S running SteamOS 3.8.16, following the listed steps and checking the battery percentage while connected. Done means the configured limit is consistently respected and the reported percentage remains accurate and stable.