Windows 8.1 touch screen not working?

Not that I'm aware of. My guess is that when the screen is off, the touch panel may remain active (in S2 or S3 power modes) so it might wake the computer if you touch it. It will use some power, of course, but I don't think it's going to be noticeable.

Anyway a few months ago I finally could reenable the power settings in my laptop without intermittent problems on the touch screen. Either MS or Sony fixed it for my set up, I' don't know at which point it was safe to enable.

That did the trick. Thanks.

Is there any potential issue having changed these power settings?

I have the same problem, the touch screen works at times but not always. I need to know what to do about it.

I am having the same problem with my new HP all in one purchased last Christmas. The touch screen has had issues with in 4 months of when we got it. Now with the 8.1 upgrade I cannot get it to work at all.

    I agree, Heck you cant even get in touch with Microsoft. At least I have not been able to, it is always some tech service in India where you can not understand them or they can not understand you 90% of the time. Then I have even been told that I have viruses or malware on my machine that is not there. They want almost $200 just for a one time service and push to sell you a $300 or more subscription for just one year. Where in the H#** does it stop. I allowed one of these so called "TECHS" to remote in to my laptop once and ended up with it totally useless as I could no longer get it to access the internet. I had to take it to a local tech, luckily a friend to get it straightened out. Now I am vary skeptical of allowing any of them to remotely access any of my computers, My wife has a fit if I even suggest having to do that.  

    Microsoft makes Billions each year with their products and I do not dispute them that right, but their support of the products they sell has gotten worse and worse. They are a FAR CRY from helping the US economy and job market as well with their farming all tech support out to the country of India. I find it VARY **FRUSTRATING!!!**that I have to struggle to understand the person I have called for tech help not to mention you have to go threw at least three different people, explaining your problem two or three times and as I said then having them tell you that there will be a "NOMINAL FEE" for the service. Oh Yea It almost always is a 2 to 3 hour phone call.

    Why is it that when the software ie the 8.1 upgrade is less than 24 hours old there is zero support or "warranty" from Microsoft. You don't even get the disks any more.

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