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9 Posts

06-23-2015

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T450s Unable to adjust screen brightness Windows 8.1

2015-06-24, 0:00 AM

Got brand new ThinkPad T450s, unable to adjust screen brightness. Func keys have no effect, Power Options do not have option to adjust screen brightness, Windows Settings it says "Windows can't adjust the brightness of this display".

 

If anyone has ideas what's not working pleas help! Thank you.

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9 Posts

06-23-2015

US

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Re: T450s Unable to adjust screen brightness Windows 8.1

2015-06-28, 4:11 AM

Still no luck. Tried version of Intel HD Graphics 5500 drivers .4206, .4222 (with these drivers Youtube video crashes Chrome - it starts clocking, CPU goes to 100% and everything freezes), version .4170, and Microsoft Basic Video Adapter drivers Chrome video work ok but neither of those drivers make Display Brightness adjustable. Dont know what else besides video drivers could be a factor.

 

I have model 20BXX009US, BIOS 1.14, HD+ 1600x900 screen, monitor in Device Manager is Generic PnP Monitor, i5-5200U with Intel HD Graphics 5500

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9605 Posts

12-27-2009

CA

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Re: T450s Unable to adjust screen brightness Windows 8.1

2015-06-28, 4:15 AM
Try reinstalling the Power Management driver?

Does adjusting the brightness work in the BIOS screen?

W520: 2960XM, Q2000M @ 1091/1380, 32GB RAM, 500GB&750GB HDD & 500GB SSD, FHD&MB168B+
X61T: L7500, 4GB RAM, 500GB HDD, XGA screen, Ultrabase
W550s: 5600U, K620M at 1164/1281, 16GB RAM, 512GB SSD, 3K touchscreen
X200s: SL9400, 6GB RAM, 64GB SD card, WXGA+ screen
TPT1: 1839-23U
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9 Posts

06-23-2015

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Re: T450s Unable to adjust screen brightness Windows 8.1

2015-06-28, 4:37 AM

Reinstalling Power Management Driver did nothing. Bightness control does not work in BIOS.

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9 Posts

06-23-2015

US

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Re: T450s Unable to adjust screen brightness Windows 8.1

2015-06-30, 2:55 AM

Ended up using recovery partition to reset laptop to factory settings, brightness control still does not work. Called Lenovo support, they said they will fix it if I buy Premium support for $199. I guess this is new Lenovo business model, ship non-working product and then charge to fix it.

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