[mythtv-users] MythTV 29.1 nVidia video jump hesitation with 5.15 kernel

[Stephen Worthington]

On Tue, 25 Jan 2022 10:37:05 +0000, you wrote:

>On Tue, 25 Jan 2022 22:23:43 +1300
>Stephen Worthington <stephen_agent at jsw.gen.nz> wrote:
>
>> On Mon, 24 Jan 2022 14:16:00 -0500, you wrote:
>> 
>> >This is a tough one, and I tend to doubt anyone will have any ideas,
>> >but I figured I'd throw it out there:
>> >
>> >For reasons I won't get into, I'm still running MythTV 29.1. This is
>> >under Gentoo and the frontend is an x86 (32 bit) machine with a GT
>> >430 nVidia card, using nvidia-drivers-390.147, and using vdpau.
>> >Currently I have both the 5.10.93 and 5.15.16 Linux kernels
>> >installed. When I use the 5.15 kernel...and ONLY with that
>> >kernel...I'm getting odd video/audio hesitations when jumping
>> >forward or back, and only in MythTV. That is, I can't reproduce this
>> >in xine or mpv. This occurs both with TV records as well as h264
>> >videos in browse mode reading from the local disk.
>> >
>> >Specifically, when I jump forward or back, there's a momentary
>> >hesitation before the audio kicks in, and during that short time, the
>> >video gets a little wonky, like it's slowing down for a second. In
>> >the 5.10 kernel everything's fine. Sort of really sucks. For now I'm
>> >just sticking with the 5.10 kernel. If anyone has any ideas I'd
>> >appreciate it. Thanks!
>> >
>> >Tom  
>> 
>> The Nvidia 390 drivers are "legacy" and support for them is limited.
>> Support ends at the end of 2022.  I suspect that they have not been
>> properly updated for the 5.15 kernels.  If you file a bug report with
>> Nvidia, it is possible that they may do something about it, but even
>> if they do, support for your GT 430 card ends at the end of 2022 with
>> the end of support for the 390 drivers.  The current 470 drivers do
>> not support cards older than the 600 series.  So if you want to keep
>> on updating the kernels on your frontend box, you will need to replace
>> the GT 430 with something more modern that will be supported, such as
>> a GT 1030.
>> 
>> And support for 32-bit mode is also going away fairly rapidly at the
>> moment in a lot of distros.  I have no idea what is planned for Gentoo
>> though.
>>
>
>I also have a GT 430 card, Nvidia 390 driver and kernel 5.15.16 on
>Gentoo. But with 64 bit and MythTV 31. I am /not/ seeing this problem,
>so maybe it is the 32bit or Myth version that is causing the issue.
>
>Steve

The 32-bit kernels are generally unloved these days - they are
reported to be much buggier than 64-bit ones.  I have not used a
32-bit one for ages so I have no personal experience.