Button and click on sleep in login screen to sleep my laptop doesn't work I have to login and use application menu and click on sleep

Hi, I hope this is the correct section,
on my laptop CLEVO L141AU 14inch magnesium running LEAP 15.6 KDE
ssd disk=2Tb, RAM=24GB, CPU= intel core i5-1335U, Graphics=Intel Iris Xe Graphics,
many times I cannot sleep clicking on the sleep icon in the login/resume screen neither using keystroke combination (fn+F12 and specially using two users) and I have to login and click on application menu>sleep to perform sleep, both (clicking on the sleep icon in the login/resume screen and using keystroke combination) seems to works, the screen turn to black but the cursor remain on the screen and after 20second the login/resume screen appears again, before doesn’t happen and may be it could be after an update.
how can I have the sleep icon in the login/resume screen and the keystroke combination working again?

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