Jerky video playback

[Volker Wysk]

Am Mittwoch, dem 14.06.2023 um 16:54 +0200 schrieb Oliver Grawert:
> hi,
> Am Mittwoch, dem 14.06.2023 um 16:40 +0200 schrieb Volker Wysk:
> 
> > > 
> > > which ubuntu release is this and what kernel/HWE stack do you have
> > > installed on it ... 
> > > 
> > > especially for AMD it makes sense to always have the latest HWE
> > > stack
> > > for kernel/graphics drivers and particuary for your problem VAAPI
> > > libs
> > > installed.
> > 
> > It's Ubuntu 22.04.2 LTS.
> > 
> > I've googled a bit about HWE stack. I found this:
> > https://www.thomas-krenn.com/de/wiki/Ubuntu_LTS_Hardware_Enablement_Stack
> > 
> > I've always just done an "apt full-upgrade". I've never cared about
> > HWE
> > stacks and HWE kernels... This seems to list what's installed:
> > 
> > desktop ~ $ apt list --installed '*linux-image*'
> > Auflistung… Fertig
> > linux-image-5.19.0-42-generic/jammy-updates,jammy-security,now
> > 5.19.0-
> > 42.43~22.04.1 amd64  [Installiert,automatisch]
> > linux-image-5.19.0-43-generic/jammy-updates,jammy-security,now
> > 5.19.0-
> > 43.44~22.04.1 amd64  [Installiert,automatisch]
> > linux-image-generic-hwe-22.04/jammy-updates,jammy-security,now
> > 5.19.0.43.44~22.04.17 amd64  [Installiert,automatisch]
> > 
> > desktop ~ $ apt list --installed '*linux-generic-hwe*' -a
> > Auflistung… Fertig
> > linux-generic-hwe-22.04/jammy-updates,jammy-security,now
> > 5.19.0.43.44~22.04.17 amd64  [installiert]
> > linux-generic-hwe-22.04/jammy 5.15.0.25.27 amd64
> > 
> > Now, do I have a HWE kernel or a GA kernel..?
> 
> GA kernel for 22.04 was 5.15.x IIRC 
> 
> it always depends how you installed or when you did a release-to-
> release upgrade with the LTS ... 

I've installed from an Ubuntu installer USB-Stick, no do-release-upgrade
done. I can't remember if it was 22.04.0 or 22.04.1.

> 
> the .0 isos/images always have the GA kernel and will not automatically
> update ... 
> 
> from .1 on the images automatically carry the HWE stack for kernel,
> xorg, wayland, mesa and such ... seems your install/upgrade was after
> .1 so you have the HWE bits (5.19.x) by default and should be fine ...
> 
> that sadly trashes my theory, but it was worth a look at least :)


I vaguely remember that I sometimes got warnings about kernels, non-existent
drivers and hwe-stack. In particular, "amd gpu" was mentioned. This seems to
occur when a new kernel is installed. Those messages were labeled
"warnings", not "errors".

I'll watch out for those messages now.


Cheers,
Volker
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