cancel
Showing results for 
Search instead for 
Did you mean: 
Reply
Guru
Posts: 1,422
Registered: ‎06-08-2013
Location: BE
Views: 165
Message 11 of 13

Re: Discrete / Integrated Graphics lags. How to connect external monitors on P52/P72

To get to a solution faster. Post the following information if you are affected when hybrid mode is enabled:

- Model
- BIOS version
- Integrated graphics driver version
- Discrete graphics driver version

Warm regards,
Jonas Hendrickx

Lenovo Insider - Windows Insider MVP

Personal website: ThinkScopes

Lenovo4K
Punch Card
Posts: 56
Registered: ‎01-07-2019
Location: DE
Views: 148
Message 12 of 13

Re: Discrete / Integrated Graphics lags. How to connect external monitors on P52/P72


@jonas_hendrickx wrote:
To get to a solution faster. Post the following information if you are affected when hybrid mode is enabled:

- Model
- BIOS version
- Integrated graphics driver version
- Discrete graphics driver version

I have the P72 and all drivers are up to date. directly from the website.

 

I had the issue in the beginning of the year and then switched to discrete mode and left and there.

This week, I tried the hybrid mode again after many driver updates from lenovo to check if this issue was solved.

 

I would say that the issue is not completely gone but much better than before. It might have something to do with the fact, that I have a 4K screen in my P72 and clone that 4K screen to a 1080p beamer via HDMI. Intel is generating the 4K desktop and Nvidia is scaling this picture to 1080p for the hdmi output. This causes high CPU usage for Desktop Window Manager (dwm.exe) which causes lags in hardware accelerated task like youtube. Running two youtubes with 60fps is not possible.

 

If I change the desktop resolution to 1080p and therefore remove the need of scaling to the beamer because it is 1:1 already, the problem is more or less gone.

 

My suggestion is, that the commnication between Intel HD Graphics 630 and Nvidia P2000 is not good.

 

Intel HD Graphics 630 alone should be able to run 4K without issues, even run 4K desktop +2x external extended 1080p screens. 

But with the hybrid mode and Nvidia Quadros, all external monitors are always forced through Nvidia and internal laptop screen is forced through Intel, makes it inevitable that these two drivers need to communicate and synchronise when cloning desktop.

 

ve2mrx
802.11n
Posts: 217
Registered: ‎07-07-2019
Location: CA
Views: 130
Message 13 of 13

Re: Discrete / Integrated Graphics lags. How to connect external monitors on P52/P72

I finally tried yesterday on my P52 with FHD screen and P1000 connected to a FHD external screen and noticed no lag. However, I was not doing anything intense.

 

All was up to date on Windows 10 1809, and it was running in hybrid graphics. Intel was managing the built-in FHD screen, Quadro P1000 managed the external HDMI FHD monitor. I think I had set the GPU to auto-select.

 

One more data point.

Martin

I'm a user, NOT a Lenovo employee. If my post helped, consider giving me a Kudos. If I solved your issue, please mark it as Solved.
P52 I7-8750H P1000 FHD 16GB 512GB-SSD 1TB-HDD

Check out current deals!


Shop current deals

Top Kudoed Authors