An update: I found this which appeared to describe my problem:

I checked /var/log/Xorg.0.log and found  the "reverting to software 
rendering" line. I then followed the recommended fix for EFI by adding "
i915.preliminary_hw_support=1" to the xen.cfg file. I then rebooted but the 
boot failed. Since the drive was encrypted I could see no way to get back 
to change xen.cfg back to the original. So I used a live LM 19.2 stick to 
see if I could access the file from it. It did ask for my encrypt password 
but would not access the drive. I finally had to re-install the Qubes OS. 
No loss, except the time involved. But I can still not watch videos.

On Sunday, July 12, 2020 at 11:10:34 PM UTC-4, Pmonf wrote:
> I recently installed Qubes 4.0.3 on a new Thinkpad E15 with an Intel 
> i-5-10210U with 16GB ram with a 512SSD.I have two problems I have not yet 
> resolved:
>      1. There is no sound on, for instance, youtube videos and the 
> framerate is very slow. It doesn't matter what template I use to access the 
> browser.
>      2. The touchpad and mouse pointer movement is not smooth and "hops" 
> across the screen in all domains.
> I have played with the Pulse Audio controls without success. If anyone 
> knows of a fix for either problem, please let me know.
> Thanks!

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