Windows 10: Windows 10 Insider Preview Build 15048 for PC & Build 15047 for Mobile Insider

Page 33 of 33 FirstFirst ... 23313233
  1.    15 Mar 2017 #320

    MTA said: View Post
    Brightness doesn't work on my ThinkPad, it's 100% all the time. On last build at least i could lower it on lock screen by key combo.
    For me it works until I first hibernate the computer. Then it stops working until a full reboot. (However sometimes it works also after hibernation.)

    I found the following workaround: Download the Intel HD Graphics driver for your ThinkPad model from the Lenovo website and install it. You then have a folder C:\DRIVERS\VIDEO\Graphics.

    Now, every time it stops working, go to this folder, search for the *.inf file located there (for me it was called ki120591.inf but it may be different for different models), right-click it and select "install". After a few seconds, the screen will refresh and brightness will work again for the current session.

    This can also be done from a shortcut using "infdefaultinstall" and the full path to the inf file, e.g. "infdefaultinstall c:\DRIVERS\VIDEO\Graphics\ki120591.inf"


    Latest, even faster, solution:
    Download "devcon.exe" as described here: windows - Quick Method to install DevCon.exe? - Super User
    Then, from an elevated command prompt, run "devcon listclass display" to identify the device ID of the video card. It will start with PCI\VEN_8086&. Now, to fix the brightness when it is stuck, run - again from an elevated command prompt (otherwise you will get a misleading error that no matching devices were found): devcon restart "@PCI_VEN8086&........." - where the thing after the @ is the device ID you copied earler.

    For me, for example (not sure if it's the same at all models), the command was: devcon restart "@PCI\VEN_8086&DEV_1916&SUBSYS_223817AA&REV_07\3&33FD14CA&0&10"

    This can even be automated by adding a task scheduler entry which triggers on a system event as follows:

    • Log: System
    • Source:Power-Troubleshooter
    • Event ID: 1

    Then configure it to run the command I wrote above (adjust path to devcon.exe and device ID as needed) and enable "run with highest privileges" to avoid a UAC prompt.
    A simpler way may be restarting the Windows graphics stack using the key combination Win+Shift+Ctrl+B. However I can't test it right now because brightness works for me now even after hibernation, but who knows for how long. << Nope, this simpler way doesn't work
    Last edited by CherryDT; 16 Mar 2017 at 16:30.
      My ComputerSystem Spec


 
Page 33 of 33 FirstFirst ... 23313233

Related Threads
837363037765980161 835189458769059840 Source: Announcing Windows 10 Insider Preview Build 15042 for PC and Build 15043 for Mobile - Windows Experience Blog
804385014485917696 Source: Announcing Windows 10 Insider Preview Build 14977 for Mobile - Windows Experience BlogWindows Experience Blog How to Update to Windows 10 Mobile Insider Preview Builds for Phones
UPDATE: 742889757512867840 Source: Announcing Windows 10 Insider Preview Build 14366 Mobile Build 14364 | Windows Experience Blog
723527224192692229 Source: Announcing Windows 10 Insider Preview Build 14328 for PC and Mobile | Windows Experience Blog How to Update to Windows 10 Mobile Insider Preview Builds for Phones
Gabe Aul tweeted: Gabriel Aul ‏@GabeAul 29m29 minutes ago #WindowsInsiders have spoken :) Preparing to release 10572. It will take about 3.5hrs for publishing prep. Will...
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd
All times are GMT -5. The time now is 09:08.
Find Us