DisplayLink Forum - View Single Post

btitus · 10-22-2013, 11:23 AM

I still had the issue with a wired mouse. I believe I've tracked this down to a problem with the Intel Dynamic Platform and Thermal Framework. Apparently this software/driver was putting the laptop into a different power state when the Yoga is in non-laptop configurations. Here's a post I made over on the Lenovo forum last night:

OK, just ran some experiments to see what I could figure out.

First of all, if you want to see the problem in action, just open up the Task Manager, and click the Performance tab. At the top you'll see the CPU with a GHz number. Now, keeping Task Manager open, start playing a video and you should see the GHz number climb up to maybe 0.60-0.80 GHz. Still while the video is playing, flip your Yoga back into stand mode. You will see the GHz drop and the number will stick at 0.42 GHz -- that's the throttling that comes from the Dynamic Platform and Thermal Framework.

So I tried the following:

1) Uninstall the DPTF from Programs and Features. I had version 7.1.0.2104 installed, which I had gotten from the Lenovo website.
2) Restart machine. Voila -- no more throttling.

3) Reinstall that same version. I thought maybe doing a complete uninstall and reinstall might make a difference.
4) Restart machine. Back to 0.42 GHz

5) Uninstall DPTF & restart (no more throttling)
6) Install version 6.0.7.1084, which is on my D: drive in the Drivers folder. Presumably the version that my machine came with.
7) Restart machine. Back to 0.42 GHz :-(
8) Uninstall & restart

So, this leads me to believe that there was some configuration of DPTF that is outside of the driver install, and it got overwritten by the 8.1 install. The other possibility is that we were always running at 0.42GHz in tablet mode, but something about 8.1 uses way more processor, so we now see issues. I guess if we could get someone with 8.0 and no issues to check this for us it would be another clue.

So for now, I'm going to leave DPTF off and see how it goes. The alternative is rolling back to 8.0, which I'd rather not do if at all possible.

At this point, I've reinstalled DPTF, but disabled through the BIOS. This solves all the performance issues for me. I'll keep monitoring Lenovo to see if they address with an updated DPTF package.

10-22-2013, 11:23 AM	#10
btitus Junior Member Join Date: Oct 2013 Posts: 6	I still had the issue with a wired mouse. I believe I've tracked this down to a problem with the Intel Dynamic Platform and Thermal Framework. Apparently this software/driver was putting the laptop into a different power state when the Yoga is in non-laptop configurations. Here's a post I made over on the Lenovo forum last night: OK, just ran some experiments to see what I could figure out. First of all, if you want to see the problem in action, just open up the Task Manager, and click the Performance tab. At the top you'll see the CPU with a GHz number. Now, keeping Task Manager open, start playing a video and you should see the GHz number climb up to maybe 0.60-0.80 GHz. Still while the video is playing, flip your Yoga back into stand mode. You will see the GHz drop and the number will stick at 0.42 GHz -- that's the throttling that comes from the Dynamic Platform and Thermal Framework. So I tried the following: 1) Uninstall the DPTF from Programs and Features. I had version 7.1.0.2104 installed, which I had gotten from the Lenovo website. 2) Restart machine. Voila -- no more throttling. 3) Reinstall that same version. I thought maybe doing a complete uninstall and reinstall might make a difference. 4) Restart machine. Back to 0.42 GHz 5) Uninstall DPTF & restart (no more throttling) 6) Install version 6.0.7.1084, which is on my D: drive in the Drivers folder. Presumably the version that my machine came with. 7) Restart machine. Back to 0.42 GHz :-( 8) Uninstall & restart So, this leads me to believe that there was some configuration of DPTF that is outside of the driver install, and it got overwritten by the 8.1 install. The other possibility is that we were always running at 0.42GHz in tablet mode, but something about 8.1 uses way more processor, so we now see issues. I guess if we could get someone with 8.0 and no issues to check this for us it would be another clue. So for now, I'm going to leave DPTF off and see how it goes. The alternative is rolling back to 8.0, which I'd rather not do if at all possible. At this point, I've reinstalled DPTF, but disabled through the BIOS. This solves all the performance issues for me. I'll keep monitoring Lenovo to see if they address with an updated DPTF package.