Microsoft's January 2026 update for Windows 11 (KB5074109) has introduced a significant issue affecting the sleep function on some older PCs. Users have reported that after installing this update, their systems fail to enter sleep mode properly, leading to system freezes and necessitating hard resets. (windowslatest.com)
Issue Details
The problem primarily affects devices utilizing the S3 sleep state, the traditional sleep mode where the system powers down most components while keeping the RAM active. This issue does not impact newer PCs that use modern standby (S0) for sleep. Affected users have described scenarios where, upon selecting sleep, the screen turns off, but the system remains active, requiring a hard restart to recover. (windowslatest.com)
Potential Workaround
A possible workaround involves disconnecting USB webcams from the affected systems. Reports suggest that removing the webcam may allow the system to enter sleep mode correctly. However, this solution is not universally effective, and users should exercise caution when attempting this workaround. (windowslatest.com)
Microsoft's Response
Microsoft has acknowledged the issue and is actively working on a resolution. In the meantime, users experiencing this problem are advised to monitor official Microsoft channels for updates and consider reaching out to Microsoft Support for personalized assistance. (windowslatest.com)
Conclusion
The January 2026 Windows 11 update has introduced a sleep mode issue affecting certain older PCs. While a potential workaround involving USB webcams exists, it may not resolve the problem for all users. Microsoft is aware of the issue and is working on a fix. Users are encouraged to stay informed through official channels and exercise caution when attempting workarounds.