XPost: linux.debian.maint.x

Source: mesa
Version: 25.0.4-1
Severity: normal
Tags: patch

Hi,

TLDR: please consider carrying this as a patch in Trixie: https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34685

Long story: the upload of gtk 4.18 last month broke GTK applications relying on the GL renderer on "very old drivers and hardware" as GTK upstream describes it [1]. Affected applications will refuse to open with messages like:

(clapper:75218): Gsk-WARNING **: 16:04:34.205: The old GL renderer has been removed. Try GSK_RENDERER=help
(clapper:75218): GStreamer-CRITICAL **: 16:04:35.334: gst_object_ref: assertion 'object != NULL' failed
(clapper:75218): GStreamer-GL-CRITICAL **: 16:04:35.334: gst_gl_memory_allocator_get_default: assertion 'GST_IS_GL_CONTEXT (context)' failed
**
GStreamer-GL:ERROR:../gst-libs/gst/gl/gstglbufferpool.c:151:gst_gl_buffer_pool_set_config: assertion failed: (priv->allocator)
Bail out! GStreamer-GL:ERROR:../gst-libs/gst/gl/gstglbufferpool.c:151:gst_gl_buffer_pool_set_config: assertion failed: (priv->allocator)
Aborted

[1] https://blog.gtk.org/2025/02/01/whats-new-in-gtk-winter-2025-edition/#:~:text=Spring%20Cleaning

Unfortunately, three platforms affected by this change are the imx8mq, imx8mplus and the ls1028a as they are found in the open hardware computers MNT Reform and MNT Pocket Reform. With this change in GTK, users of those platforms are stuck with Bookworm. This is unfortunate, as there are not many laptops out there which are as open as the products by MNT and my work for that platform recently even received EUR 1.400,00 sponsorship by Debian itself [2]. It would be nice if Debian Trixie continued supporting devices with Vivante GC7000 running GTK applications that require GL renderer.

[2] https://mister-muffin.de/reform/funding-application.html

I already approached the GTK maintainers about this but they are understandably not keen about reverting 18k line long patch. [3] Fortunately, there seems to be a relatively easy workaround for the situation. Christian Gmeiner opened a MR [4] which adds texelfetch support and with that, one can then run applications like clapper with the environment variable MESA_GL_VERSION_OVERRIDE=3.2 and things work again.

[3] https://gitlab.gnome.org/GNOME/gtk/-/commit/af2aadbe9b4683b752eb2ee10776e36f3fd9f2a7
[4] https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34685

Especially having clapper working would be of great value for above platforms as clapper seems to be the only video player application which is able to take advantage of the hardware acceleration that the affected platforms offer (via hantro). Otherwise, users of those platforms will be stuck to 720p or lower quality video.

I know that it is late in the freeze but the GTK 4.18 upload was also late in the freeze and the MNT Reform and MNT Pocket Reform were working just fine until the GTK upload broke applications like Clapper due to dropping the GL backend. It would be really nice if mesa in Debian Trixie could backport the relatively small and targeted improvements from above MR by Christian Gmeiner to at least have a relatively simple workaround using MESA_GL_VERSION_OVERRIDE=3.2 in the environment.

Thanks!

cheers, josch

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XPost: linux.debian.maint.x

Hi,

Quoting Johannes Schauer Marin Rodrigues (2025-04-24 15:24:17)

I already approached the GTK maintainers about this but they are understandably
not keen about reverting 18k line long patch. [3] Fortunately, there seems to be a relatively easy workaround for the situation. Christian Gmeiner opened a MR [4] which adds texelfetch support and with that, one can then run applications like clapper with the environment variable MESA_GL_VERSION_OVERRIDE=3.2 and things work again.

[...]

I know that it is late in the freeze but the GTK 4.18 upload was also late in the freeze and the MNT Reform and MNT Pocket Reform were working just fine until the GTK upload broke applications like Clapper due to dropping the GL backend. It would be really nice if mesa in Debian Trixie could backport the relatively small and targeted improvements from above MR by Christian Gmeiner to at least have a relatively simple workaround using MESA_GL_VERSION_OVERRIDE=3.2 in the environment.

I have an important correction to make. The correct environment variable setting is this one:

MESA_GLES_VERSION_OVERRIDE=3.2

Sorry for the trouble that my typo caused!

cheers, josch
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XPost: linux.debian.maint.x

Control: affects -1 + src:clapper src:livi

Hi Timo,

Quoting Johannes Schauer Marin Rodrigues (2025-04-24 15:24:17)

Source: mesa
Version: 25.0.4-1
Severity: normal
Tags: patch

Hi,

TLDR: please consider carrying this as a patch in Trixie: https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34685

Long story: the upload of gtk 4.18 last month broke GTK applications relying on
the GL renderer on "very old drivers and hardware" as GTK upstream describes it
[1]. Affected applications will refuse to open with messages like:

(clapper:75218): Gsk-WARNING **: 16:04:34.205: The old GL renderer has been removed. Try GSK_RENDERER=help
(clapper:75218): GStreamer-CRITICAL **: 16:04:35.334: gst_object_ref: assertion 'object != NULL' failed
(clapper:75218): GStreamer-GL-CRITICAL **: 16:04:35.334: gst_gl_memory_allocator_get_default: assertion 'GST_IS_GL_CONTEXT (context)' failed
**
GStreamer-GL:ERROR:../gst-libs/gst/gl/gstglbufferpool.c:151:gst_gl_buffer_pool_set_config: assertion failed: (priv->allocator)
Bail out! GStreamer-GL:ERROR:../gst-libs/gst/gl/gstglbufferpool.c:151:gst_gl_buffer_pool_set_config: assertion failed: (priv->allocator)
Aborted

[1] https://blog.gtk.org/2025/02/01/whats-new-in-gtk-winter-2025-edition/#:~:text=Spring%20Cleaning

Unfortunately, three platforms affected by this change are the imx8mq, imx8mplus and the ls1028a as they are found in the open hardware computers MNT
Reform and MNT Pocket Reform. With this change in GTK, users of those platforms
are stuck with Bookworm. This is unfortunate, as there are not many laptops out
there which are as open as the products by MNT and my work for that platform recently even received EUR 1.400,00 sponsorship by Debian itself [2]. It would
be nice if Debian Trixie continued supporting devices with Vivante GC7000 running GTK applications that require GL renderer.

[2] https://mister-muffin.de/reform/funding-application.html

could we please get your feedback on this bug?

It would be really nice if users of the very few reasonably open smartphone (librem5) and laptop (mnt reform) platforms could continue to enjoy watching 1080p video in Debian Trixie despite the recent GTK 4.18 upload.

If you do not have time, I can also offer to NMU mesa with the patch by Christian Gmeiner after agreement with the release team.

Thanks!

cheers, josch
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XPost: linux.debian.maint.x

Hi Timo,

Quoting Timo Aaltonen (2025-05-16 13:16:09)

Sorry for the delay, but yes I'll add these patches for the next version. 25.0.6 is out, but maybe I'll shoot for 25.0.7 instead which is the last of the series, and should be released on the 28th. Or upload just this now (next week) and the bugfix release later.

this is amazing news! Thank you so much! \o/

cheers, josch
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