English Community

ThinkPad NotebooksThinkPad: T400 / T500 and newer T series Laptops
All Forum Topics

2 Posts



2 Signins

50 Page Views

  • Posts: 2
  • Registered: ‎10-26-2012
  • Location: California
  • Views: 50
  • Message 1 of 2

T420s Crashes with Discrete and Optimus Bios Display Setting

2012-10-26, 21:32 PM

I am running windows 7 64bit and when I boot my laptop crashes and reboots over and over when I have the BIOS Display setting set to Discrete or Optimus. If I use the integrated graphics setting it boots up just fine, but I am not able to use my dock w/ external monitor properly.


The event viewer renders no useful information about the issue. I have installed the latest Intel display driver for my HD 3000 videocard. Has anyone has a similar issue?


1491 Posts



2871 Signins

58967 Page Views

  • Posts: 1491
  • Registered: ‎05-29-2010
  • Location: SG
  • Views: 58967
  • Message 2 of 2

Re: T420s Crashes with Discrete and Optimus Bios Display Setting

2012-10-27, 5:56 AM

Hi codeblue2k

Uninstall the current NVIDIA driver in Integrated mode, switch back to Optimus in BIOS, and install NVIDIA driver again through ThinkVantage System Update.

Have a nice day! :smileytongue::smileyhappy::smileyvery-happy:


W520 (4284-A99)

Does someone’s post help you? Give them kudos as a reward, as they will do better to improve | Mark it as solved if the solution works for you, so it could be reference for others in the future


Sound Enthusiast and Enhancement (Post comments, share mixes, etc.)

Dolby Home Theater v4 ; IdeaPad Slate Tablet

Forum Home

Community Guidelines

Please review our Guidelines before posting.

Learn More

Check out current deals!

Go Shop