Web video suddenly plays at 1/6 speed

[justin.h...@gmail.com]

I have a recent desktop machine running Qubes 3.2 on a 4GHz i7 with 16GB of RAM
and integrated Intel graphics. Until yesterday, I'd been happily watching
Netflix and Youtube videos without any trouble.

Then I boot up my PC one day and suddenly playback on those sites is at about
1/6 speed--totally unwatchable. It's the same whether the Qube is based on
fedora-23, fedora-24, debian-8, or debian-9. It also doesn't matter whether I
use Firefox or Chrome. It still happens on a fresh Qube made from an untouched
template.

Performance otherwise is great--my connection is testing at about 50Mb,
applications (including browsers) are fast and responsive as ever. I can even
watch videos in VLC without any problems. It's only browser-based playback that
doesn't work, and it never works no matter what.

I didn't do anything unusual before this started happening except trim all the
templates (which I'd never done) and update all the templates (which I do
regularly).

I'm completely baffled by this, so I'm turning to the list for help. Any ideas?

[Andrew David Wong]

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Make sure hardware acceleration is disabled in your browsers' settings.

- --
Andrew David Wong (Axon)
Community Manager, Qubes OS
https://www.qubes-os.org
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[justin.h...@gmail.com]

On Saturday, January 14, 2017 at 1:44:05 AM UTC-8, Andrew David Wong wrote:
>
> Make sure hardware acceleration is disabled in your browsers' settings.
>

Unfortunately, this didn't help in my case.

[raah...@gmail.com]

I've believed appvms are trimmed already and only dom0 might need manually trimming. But I could be wrong.

Weird how its only your browsers affected. Have you tried deleting the appvm's and recreating them?

[justin.h...@gmail.com]

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Closing the loop here since I partially diagnosed and ultimately fixed the issue.

I had been booting Qubes in UEFI mode for as long as it was working normally. I then updated the kernel and must have done something wrong because after that the machine would only boot in BIOS mode. That was when the video playback issues started.

I ended up re-installing the entire OS and restoring my individual VMs from backups, which was overkill to fix the boot issue but I wasn't sure at the time that that's what it was.

Finally, to answer the question immediately above, I did try with totally fresh TemplateVMs and AppVMs to no avail.

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