I don't know what happened, now it is worked. What I know that I did to my laptop: 1. There is an update from Windows to 21H1 2. I did disable the pagefile and hibernate file Don't know which one make the button worked again.
Hi, I just realized (but don't know since when) that my Fn+F4 (mute) function is not working anymore, I have been searched in the discussion try the solutions: 1. Check BIOS version (mine currently 1.29.4) 2. Check Fn setting in BIOS (enable/disable with any combination) 3. Uninstall drivers   None of them are working. Please kindly help, do I need to downgrade the BIOS?   Thanks, Rgds, Adhari
Dell E7470 Fn F4 not working