[mythtv-users] mythfrontend core dumps after upgrade to Ubuntu 24.04

[Alain]

Thanks John,

      This issue is now resolved as far as I can tell.  I removed the 
left-over /usr/lib/x86_64-linux-gnu/dri/nvidia_drv_video.so, 
installed nvidia-vaapi-driver and recompiled myth-0.35 with VAAPI : no 
more crashes.

Alain

On 1/2/26 18:12, Alain via mythtv-users wrote:
> On 1/2/26 17:42, John Hoyt wrote:
>>
>>
>> On Fri, Jan 2, 2026 at 11:32 AM Alain via mythtv-users 
>> <mythtv-users at mythtv.org> wrote:
>>
>>     On 1/2/26 17:15, John Hoyt wrote:
>>>     On Fri, Jan 2, 2026 at 11:10 AM Alain via mythtv-users
>>>     <mythtv-users at mythtv.org> wrote:
>>>
>>>             So next, recompile myth without VAAPI, or figure out why
>>>         using dkms would make a difference from using apt.
>>>
>>>     The dkms suggestion was more from me being bit by the kernel
>>>     upgrade process not completing fully leaving bad modules in
>>>     place.  It was a long shot, but worth trying.
>>
>>     Thanks, I do believe I had a similar experience in the past.
>>
>>        I've now recompiled mythtv with --disable-vaapi and without
>>     --disable-vdpau. I no longer get a core dump from mythfrontend.
>>
>>     Not being an expert, I don't know what the next step might be or
>>     should be.
>>
>> Another couple ideas, did the ubuntu upgrade remove (or not update) 
>> the nvidia-vaapi-driver?   Also, did Ubuntu possibly switch you from 
>> Xorg to Wayland?
>
> Thanks John, I believe you had the right idea about VAAPI.
>
> Definitely Xorg, not Wayland.
>
> mytv[32] apt list nvidia-vaapi-driver
> Listing... Done
> nvidia-vaapi-driver/noble 0.0.8-1 amd64
>
>     So not installed, but it only holds one file :
>
> nvidia-vaapi-driver: /usr/lib/x86_64-linux-gnu/dri/nvidia_drv_video.so
>
>     Of which, I have a left-over  :
>
> root%mytv[27] ls -l /usr/lib/x86_64-linux-gnu/dri/nvidia_drv_video.so
> -rw-r--r-- 1 alain alain 93056 jan  3  2021 
> /usr/lib/x86_64-linux-gnu/dri/nvidia_drv_video.so
>
>      So tomorrow, remove, the old nvidia_drv_video.so, recompile with 
> VAPPI, retry, and install nvidia-vaapi-driver if required.
>
> Alain
>
>
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