Mailing List Archive

On Sun, Mar 24, 2024, 9:16?AM John Pilkington <johnpilk222@gmail.com> wrote:

> I just did a quick search on this without finding much.
>
> For years I have been running mythtv master in Fedora KDE X11 with a
> cheapo nvidia GT 710 card, mainly to get an HDMI output, using the
> rpmfusion build of the closed-source 470xx driver. That driver will
> lose support later this year and its latest version is not yet available
> in rpmfusion.
>
> A few weeks ago after a kde update I started getting usually-brief
> pauses with notifications of graphics resets in Kwin, and the kde-fedora
> list suggested switching to the reverse-engineered nouveau driver, with
> the possibility that this might also work with Wayland, the 'coming thing'.
>
> I now have MythTV master running with nouveau in the Plasma-X11
> environment, although I haven't yet tried using VDPAU acceleration or
> deinterlace; it works and suits my use case.
>
> But Wayland isn't as good. mythfrontend says VDPAU isn't available,
> the menu screens show ghosting, the HDMI TV screen needs a new login
> after it times out or is power cycled, and the (deprecated) mythtv-setup
> crashes on exit.
>
> I'm not sure whether these are 'known unknowns' or just unknown. Are
> they worth an 'issue' ?
>
> John P
>
>
> _____________
>

On my front ends running Wayland I run mythfrontend --platform xcb

Jim A

On 24/03/2024 19:56, James Abernathy wrote:
>
>
> On Sun, Mar 24, 2024, 9:16?AM John Pilkington <johnpilk222@gmail.com
> <mailto:johnpilk222@gmail.com>> wrote:
>
> I just did a quick search on this without finding much.
>
> For years I have been running mythtv master in Fedora KDE X11 with a
> cheapo nvidia GT 710 card, mainly to get an HDMI output, using the
> rpmfusion build of the closed-source 470xx driver.  That driver will
> lose support later this year and its latest version is not yet
> available
> in rpmfusion.
>
> A few weeks ago after a kde update I started getting usually-brief
> pauses with notifications of graphics resets in Kwin, and the
> kde-fedora
> list suggested switching to the reverse-engineered nouveau driver, with
> the possibility that this might also work with Wayland, the 'coming
> thing'.
>
> I now have MythTV master running with nouveau in the Plasma-X11
> environment, although I haven't yet tried using VDPAU acceleration or
> deinterlace;  it works and suits my use case.
>
> But Wayland isn't as good.  mythfrontend says VDPAU isn't available,
> the menu screens show ghosting, the HDMI TV screen needs a new login
> after it times out or is power cycled, and the (deprecated)
> mythtv-setup
> crashes on exit.
>
> I'm not sure whether these are 'known unknowns' or just unknown.  Are
> they worth an 'issue' ?
>
> John P
>
>
> _____________
>
>
> On my front ends running Wayland I run mythfrontend --platform xcb
>
> Jim A

Thanks Jim, that could be useful. I just tried the inverse.

from konsole under Plasma-X11. None of the wayland options were found.
{{{

[john@HPFed ~]$ mythfrontend --platform wayland
Failed to create wl_display (No such file or directory)
qt.qpa.plugin: Could not load the Qt platform plugin "wayland" in ""
even though it was found.
This application failed to start because no Qt platform plugin could be
initialized. Reinstalling the application may fix this problem.

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl,
offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl,
wayland-xcomposite-glx, xcb.

Aborted (core dumped)


[john@HPFed ~]$ mythfrontend
2024-03-25 10:45:13.240403 I Display: Requesting EGL for vendor 'Mesa
Project, 1.5'
2024-03-25 10:45:13.424655 I Setup Interrupt handler
2024-03-25 10:45:13.424663 I Setup Terminated handler
2024-03-25 10:45:13.424670 I Setup Segmentation fault handler
2024-03-25 10:45:13.424677 I Setup Aborted handler
2024-03-25 10:45:13.424683 I Setup Floating point exception handler
2024-03-25 10:45:13.424690 I Setup Illegal instruction handler
2024-03-25 10:45:13.424697 I Setup Bus error handler
2024-03-25 10:45:13.424705 I Setup Real-time signal 0 handler
2024-03-25 10:45:13.424711 I Setup Hangup handler
2024-03-25 10:45:13.424719 I Setup User defined signal 1 handler
2024-03-25 10:45:13.424725 I Setup User defined signal 2 handler
2024-03-25 10:45:13.424888 C mythfrontend version: HEAD
[v35-Pre-895109dd63] www.mythtv.org
2024-03-25 10:45:13.424892 C Qt version: compile: 5.15.12, runtime: 5.15.12
2024-03-25 10:45:13.424917 I Fedora Linux 38 (Thirty Eight) (x86_64)

}}}


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On Mon, Mar 25, 2024, 05:08 John Pilkington <johnpilk222@gmail.com> wrote:

> On 24/03/2024 19:56, James Abernathy wrote:
> >
> >
> > On Sun, Mar 24, 2024, 9:16?AM John Pilkington <johnpilk222@gmail.com
> > <mailto:johnpilk222@gmail.com>> wrote:
> >
> >
> >
> > On my front ends running Wayland I run mythfrontend --platform xcb
> >
> > Jim A
>
> Thanks Jim, that could be useful. I just tried the inverse.
>
> from konsole under Plasma-X11. None of the wayland options were found.
>

I'm not entirely certain if you expected them to be, but indeed this is
certainly not the case.

Wayland is a new architecture that has [partially broken and buggy]
backwards compatibility plugins for x11 applications, while x11 is not
forward compatible with Wayland protocol applications nor will it ever be.
Something like WayDroid does not work under x11 and simply can't.

The fact that QT applications and KDEs compositor can run on both is only
due to two completely separate code paths that ideally the developers would
like to merge into a Wayland only product.

Mike

On 25/03/2024 15:09, Mike Hodson wrote:
> On Mon, Mar 25, 2024, 05:08 John Pilkington <johnpilk222@gmail.com
> <mailto:johnpilk222@gmail.com>> wrote:
>
> On 24/03/2024 19:56, James Abernathy wrote:
> >
> >
> > On Sun, Mar 24, 2024, 9:16?AM John Pilkington
> <johnpilk222@gmail.com <mailto:johnpilk222@gmail.com>
> > <mailto:johnpilk222@gmail.com <mailto:johnpilk222@gmail.com>>> wrote:
> >
> >
> >
> > On my front ends running Wayland I run mythfrontend --platform xcb
> >
> > Jim A
>
> Thanks Jim, that could be useful.  I just tried the inverse.
>
> from konsole under Plasma-X11.  None of the wayland options were found.
>
>
> I'm not entirely certain if you expected them to be, but indeed this is
> certainly not the case.
>
> Wayland is a new architecture that has [partially broken and buggy]
> backwards compatibility plugins for x11 applications, while x11 is not
> forward compatible with Wayland protocol applications nor will it ever
> be.  Something like WayDroid does not work under x11 and simply can't.
>
> The fact that QT applications and KDEs compositor can run on both is
> only due to two completely separate code paths that ideally the
> developers would like to merge into a Wayland only product.
>
> Mike
>

Thank you for that explanation. I really didn't know what to expect.

For the present I think I shall stay with X11, but it does look as if my
hardware could run with Wayland if necessary.

John


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On Mon, Mar 25, 2024 at 3:11?PM Mike Hodson <mystica@gmail.com> wrote:

> Wayland is a new architecture

And MythTV (native) Wayland support
is a work in progress. TTBOMK there
is currently no developer who is focusing
on Wayland development at the moment.

It should be noted that while X11 on
Wayland (using XWayland) can work
for many cases, there are various
issues about GPU acceleration support
depending on your GPU and platform
versions.

As more distros and DE's are sunsetting
native X11 support (in favor of using
XWayland for apps still using X11)
some of the issues may get resolved
over time, although there are some
issues that are stated to require
protocol changes to Wayland, and
those take time to be accomplished.
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