Specific to Lenovo e540 ThinkPad Brightness level #s gone. When I press F5 & F6 brightness still changes but the graphical 1-15 level indicator is gone. I thought it'd be the Lenovo HotKeys software but the graphical 1-50 level indicator still works for the volume keys F2 & F3. So I don't know what's up.
The first thing I'd try is installing the latest version of the Hotkey Features Integration software. https://pcsupport.lenovo.com/us/en/...er-list/component?name=Software and Utilities
I did reinstall the latest 12.06.2017 n1qvub3e.exe. At first it took away the graph for the sound. After booting into Safe Mode & reinstalling again the sound graph came back but the brightness graph is still not back.
Here are some more things to try. Other than the solutions listed in the following two links, I'm out of ideas. https://forum.thinkpads.com/viewtopic.php?t=126960 https://forums.lenovo.com/t5/Lenovo...isplay-Not-Working/m-p/1045219?page=1#1049871 One more thing to try I guess would be to see if the Windows 10 version will install on Windows 8.1. It's been updated very recently, so I think it's worth trying.
Idk if what you pointed out worked or not. But THANK YOU. I never remember exactly how I fix these things. I just Google like crazy (like super fast) & try what seems reasonable (fast, fast, fast) from reasonable sources. This was fixed after I deleted Lenovo PM Driver in Device Manager did not reboot, installed an older version of Lenovo PM Driver. Then rebooted & W7P64 said it installed Lenovo PM Driver. It would not work without installing the older version. So uninstalled 1.67.16.42, didn't reboot, installed 1.67.14.7, rebooted. Now Device Manager reports 1.67.14.7 is installed.
