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Update dependencies to switch qt backend to pyqt6#1187

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switch-qt-backend
Jun 17, 2026
Merged

Update dependencies to switch qt backend to pyqt6#1187
constantinpape merged 5 commits into
mainfrom
switch-qt-backend

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@anwai98

@anwai98 anwai98 commented Apr 1, 2026

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This currently switches the qt backend to pyqt6 for making napari v7 GUI launch work! (more context in napari/napari#8808)

PS. I still need to check micro-sam's compatibility with the v7 updates, that'll be the next step!

cc: @constantinpape (I'll leave this PR open for now)

@anwai98

anwai98 commented Apr 1, 2026

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Okay, the conda platform selector trick does not work for Windows like the way I did. Hmm interesting!

@anwai98

anwai98 commented Apr 1, 2026 •
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Okay, it's indeed true that macOS and Windows don't like / have qt6-wayland package compatibility at all (makes it a bit more difficult to generalize).

PS. I think the last resort (an obvious solution) might be to ask users to install micro-sam by adding qt6-wayland as an additional dependency by hand!

@constantinpape

constantinpape commented Jun 4, 2026

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Just following up here: it appears like napari/napari#9009 will fix the issues and make it possible to install without users needing to specify GUI packages. We should wait for this before updating qt backends / unpinning napari in the conda env.

@anwai98

anwai98 commented Jun 4, 2026

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Nice!

@TimMonko

TimMonko commented Jun 4, 2026

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Thanks you for following along with napari's work, and do continue to reach out in scenarios like this (like in napari/napari#8808) so that we can all move forward together! 🍻

@anwai98

anwai98 commented Jun 8, 2026

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Thanks @TimMonko for the appreciation. And quick re on the PR above: @constantinpape: the PR with modular backend switch has been merged now napari/napari#9009.

We'll wait until the next official release to check it out! ;)

@anwai98 anwai98 mentioned this pull request Jun 9, 2026
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@constantinpape

constantinpape commented Jun 16, 2026 •
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The release is there now: https://github.com/napari/napari/releases/tag/v0.7.1
Edit: but not on conda-forge yet, so can't yet be tested

@constantinpape

constantinpape commented Jun 17, 2026

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Release is on conda-forge now.

@constantinpape constantinpape marked this pull request as ready for review June 17, 2026 13:10
@constantinpape constantinpape changed the base branch from dev to main June 17, 2026 13:10
@anwai98

anwai98 commented Jun 17, 2026

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Let's wait until we merge this @constantinpape. I got segfaults in the morning when I tried installing it!

(I'll debug it in some what's the root cause)

@constantinpape

constantinpape commented Jun 17, 2026

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I am also setting up an env to test it right now.

@anwai98

anwai98 commented Jun 17, 2026 •
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Okay the segfaults can be dodged using your fontconfig cache removal, but I notice some other RuntimeError: Cannot FRAMEBUFFER object 15 because it does not exist, once napari opens up -> I'll debug this quickly with Claude!

@anwai98

anwai98 commented Jun 17, 2026

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Found it. It's an opengl platform choice issue. Lemme validate a few more things before I conclude on a solution!

@constantinpape

constantinpape commented Jun 17, 2026

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I also had to delete the font-cache to avoid the Segmentation Fault. But then it worked for me.

@constantinpape

constantinpape commented Jun 17, 2026

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I will go ahead and merge this. Can you update the FAQ with a short description how to fix the pyopengl backend issue if it happens?

@constantinpape constantinpape merged commit 0d8cd33 into main Jun 17, 2026
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@constantinpape constantinpape deleted the switch-qt-backend branch June 17, 2026 14:27
anwai98 added a commit that referenced this pull request Jun 17, 2026
@anwai98 @constantinpape
Merge main to dev (#1242)
456b74d 
* Update dependencies to switch qt backend to pyqt6 (#1187)

* Update dependencies to switch qt backend to pyqt6

* Try to remove qt6-wayland from dependencies and add it for linux CI

* Update napari version requirement in environment.yaml

* Bump version from 1.8.2 to 1.8.3

---------

Co-authored-by: Constantin Pape <constantin.pape@informatik.uni-goettingen.de>

* Bump version in PyPI as well (#1239)

* Add FAQ for napari fontconfig segfault and Wayland OpenGL errors (#1240)

* Update release overview with napari pins removed (#1241)

---------

Co-authored-by: Constantin Pape <constantin.pape@informatik.uni-goettingen.de>
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3 participants

@anwai98 @constantinpape @TimMonko