I am also having this same problem -- any updates?
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T450s refurbished
Lenovo OnScreen Display Utility; Hotkey Features Integration for Windows 10; Advanced Configuration and Power Management Interface (ACPI) Driver; Lenovo Energy Management (Power Management) Tip. If only combinations Fn+F5, Fn+F7 do not work properly, try to install official drivers Wi-Fi and Bluetooth from Lenovo site.
i5-5300
Windows 10 Pro Version 1801 installed 1/3/2019 OS build 17134.112
All my issues are the same:
1) F5 and F6 keys do not adjust brightness. However, the keys themselves DO work. When FnLk is ON, they perform their programmed functions. For example, in Microsoft Edge, pressing F5 refreshes the page. F6 selects all text in the URL bar.
2) In Settings>System>Display there is no option to adjust brightness.
A few other things I tried.
3) In Windows Mobility Center (search in the search box) there is a Display Brightness slider. When I adjust this slider, nothing happens. See screenshot.
4) I went to Device Manager>Display Adapters>Intel HD Graphics 5500>Update Driver>Search automatically for updated driver software. But my driver was up to date.
5) I tried Device Manager>Display Adapters>Intel HD Graphics 5500>Update Driver>Browse my computer for driver software>Let me pick from a list of available drivers on my computer>Microsoft Basic Display Adapter. This did not fix the problem.
6) I tried Device Manager>Monitors> Search automatically for updated driver software. Again, my driver was up to date.
7) I tried Device Manager>Monitors>Disable Device. Nothing happened (I expected my screen to stop working). For good measure, I enable the device again, but nothing changed.
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8) I clicked on Notification Center. There is no adjust brightness setting in there. The only display-related option is 'Night Light', and that button is grayed out.
I would try @Vijay-Verma's advice...
I would recommend that you restore from a system restore point to a point when things were working fine
... but this is a refurbished machine. It arrived to me like this this morning.
And, yes, I called the refurbishing company. I talked to them for 45min trying the solutions above to no effect. They were just as stumped as I was.
Can anyone ANYONE help with this issue? Seems like a Microsoft Windows 10 issue or a Lenovo issue.
Thank you!
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UPDATE: I also tried updating my drivers through the Lenovo Vantage app. I updated 12 different ones, including HD Intel Graphics Driver V.20.19.15.5058. Still no fix.
Another fix that doesn't work: Rolling back the graphics driver. I don't remember the exact one I rolled it back to, it was something like 10.XX.XX.XX.XXXX. I also tried installing another driver (20.19.15.4331). No luck yet.
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Lenovo recognized this problem back in Nov 2017 for ALL lenovos running on Windows, but none of the solutions work on mine. GRR. https://support.lenovo.com/jp/en/solutions/ht500157