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MightyMauz
Not applicable
Posts: 59
Registered: ‎11-06-2008
Location: US
Views: 754
Message 1 of 5

T550 can't adjust brightness

I just received a second-hand T550 and it is a great machine, with one problem: I cannot change the screen brightness. I have done a clean reinstall of Windows 10 and let Lenovo System update download all the drivers, but I cannot change the brightness anywhere. Not with the Fn keys, not in the notification center, and it doesn't even show up in the power options. Where on my other laptops there are options for turn off display, put computer to sleep and brightness, on my new T550 the brightness option is non-existent.

I have installed the latest:

  • intel 5500HD driver
  • hotkey integration
  • monitor inf file

And still, it is not working. Does anyone have a suggestion for me?

---------------
X220 Tablet 4298R45; X200s 7470CR9
richk
Not applicable
Posts: 9,482
Registered: ‎01-01-2010
Location: US
Views: 752
Message 2 of 5

Re: T550 can't adjust brightness

It means someone changed the LCD to a non-Lenovo panel.  The edid (configuration chip) has the wrong information.


Rich


I do not respond to requests for private, one-on-one help. Your questions should be posted in the appropriate forum where they may help others as well.

If a response answers your question, please mark it as the accepted solution.

I am not an employee or agent of Lenovo.
MightyMauz
Not applicable
Posts: 59
Registered: ‎11-06-2008
Location: US
Views: 721
Message 3 of 5

Re: T550 can't adjust brightness

My system information (F10 on boot) says that I have a BOE NV156FHM-N42 panel.
---------------
X220 Tablet 4298R45; X200s 7470CR9
richk
Not applicable
Posts: 9,482
Registered: ‎01-01-2010
Location: US
Views: 703
Message 4 of 5

Re: T550 can't adjust brightness

My experience has been that the Lenovo ones have the panel id changed.  Lenovo or Len in the name.

 

I don't have a T550 to check.


Rich


I do not respond to requests for private, one-on-one help. Your questions should be posted in the appropriate forum where they may help others as well.

If a response answers your question, please mark it as the accepted solution.

I am not an employee or agent of Lenovo.
MightyMauz
Not applicable
Posts: 59
Registered: ‎11-06-2008
Location: US
Views: 689
Message 5 of 5

Re: T550 can't adjust brightness

Is there a way to fix this? Other than putting in a whole new (Lenovo) panel? Maybe just a new chip or a modded BIOS?

---------------
X220 Tablet 4298R45; X200s 7470CR9

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