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[Launchpad Bug Tracker <2124106@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package ubuntu-raspi-settings - 25.10.3

---------------
ubuntu-raspi-settings (25.10.3) questing; urgency=medium

  * 10-pi-gsk-renderer.conf: Work around rendering issues in GTK4 applications
    by using the "gl" renderer instead of "vulkan" (LP: #2124106)

 -- Dave Jones <dave.jones@xxxxxxxxxxxxx>  Tue, 30 Sep 2025 17:18:54
+0100

** Changed in: ubuntu-raspi-settings (Ubuntu)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/2124106

Title:
  Ptyxis output and window corruption on Raspberry Pi

Status in GTK+:
  New
Status in gtk4 package in Ubuntu:
  Confirmed
Status in mesa package in Ubuntu:
  Confirmed
Status in ptyxis package in Ubuntu:
  Invalid
Status in ubuntu-raspi-settings package in Ubuntu:
  Fix Released

Bug description:
  On the current questing daily for the Raspberry Pi, on a Pi 5 (tested
  on 8GB and 16GB models), the ptyxis terminal seems to struggle to
  output all characters when many (non-blank) characters are present on
  the screen, and the terminal is above a certain size.

  When the application is maximized on a 1920x1080 screen, ptyxis
  initially displays everything correctly (vim within tmux, including
  various indicators at the bottom right of the terminal); this is
  1.png. However, splitting the vim window to display two buffers
  results in ptyxis failing to display the characters beyond a certain
  row of the terminal; 2.png.

  Scrolling around the file, the row of the terminal beyond which output
  fails is not fixed, which makes me think this is some sort of timing
  bug. However, despite not displaying the characters themselves, ptyxis
  does appear to display the *background* colours of those cells (are
  background cells drawn first then characters on top?).

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