Keyboard Backlit Precision 3551 Always On

I'm struggling to find a solution for the backlit keyboard on my Precision 3551. After migrating to Windows 11 and updating to the most current bios version (1.26.0), downloaded directly from Support Assist, the light is always on. In Bios there is no option related to this feature. I configured the system to turn off the video and hard drive after one minute. After this time, the keyboard light also turns off, but as soon as it comes back from sleep, the problem persists. I already removed and reinstalled the cables, left the battery empty and held the power button for 30 seconds. The function is working, but not properly. I saw some users reporting the same problem after installing this version. I downgraded to versions 1.25.0 and 1.24.1, but without success, neither in functionality nor in the bios configuration. Can someone help me?