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Thinkpad brightness control not working3/19/2023 ![]() Second your LCD needs to allow overwriting the EDID (unfortunately i can't help with finding out about that) and it's timings must be the same as one of accepted LCDs (read this as being "compatible replacement part") I attached the full lists for the T450/T450s and the T550/W55s that i found in the notebookreview forum by user T456 Well, you can either get a first party replacement LCD or you can hack yours so the EDID on it is one of the ones white listed on the BIOS, and i choose the latter.įirst of all you need at least one of the white listed EDIDs on the bios (you can dump the one from your old display if you are just replacing a damaged screen). On the Thinkpad's BIOS that is a list of accepted EDIDs (that just happen to be the first party ones), if your display was an EDID that is not on the list, the video drivers on Windows will not allow you to control the display brightness (it works on Linux just fine by the way). In short terms every modern display device was a thing called EDID (Extended Display Identification Data) that was a identification and timing information for the display. And i figure i would be a good idea to document what i did just in case someone wants to do the same upgrade. I had replaced the screen on my Thinkpad T450 from an 1366x768 TFT panel to an 1920x1080 IPS panel (model LP140WF3-SPC1). At first all seams to work, but when i got into windows the brightness control has not working.Īfter a lot of trouble shooting, research and some frustration later i managed to find why and how to fix the issue. I fixed the problem with fairly simple hack on the LCD panel. TL DR I replaced the screen on my T450, but the brightness control was not working on Windows.
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