05-09-2016 07:22 AM
When I put my P70 on the dock station and I boot. I'm not able to see the screen that boot on my Monitor. I have a DVI connector.
I'm able to see the Windows screen when the boot ended, but not the boot menu. I been in the BIOS and change the setting from THINKPAD LCD to all monitors (3th one).
if I want to see the boot menu, I have to open the p70 screen and close it after the boot. I had no problem with my T510 and my monitor.
Do I have to change to a Displayport cable ?
Solved! Go to Solution.
05-12-2016 12:34 PM
Think Engineering has provided additional information about why booting a ThinkPad P70 from a dock to a monitor connected via DVI cables or DisplayPort results in a blank screen.
The blank screen occurs because the discrete GPU will not turn on until the Windows device driver is loaded in Hybrid Graphics mode. Thus, a setup that uses DVI or DisplayPort on Dock cannot display the ThinkPad boot logo to external monitor.
There is a workaround to change this.
Go to BIOS Setup -> Config -> Display -> Graphics Device setting and change from “Hybrid Graphics” to “Discrete Graphics”. Please note that using Discrete Graphics mode will result in shorter battery life when the system is undocked.