flameshot-org/flameshot

flameshot screen / full freezes

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#2,446 opened on Feb 19, 2022

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BugHelp WantedLinux

Description

Flameshot Version

Flameshot v11.0.0 (aa6b5ea) Compiled with Qt 5.15.2

The same happens with the 11.0.0 release.

Installation Type

Compiled from source

Operating System type and version

Gentoo Linux

Description

flameshot freezes while showing the “Save screenshot” dialog when running flameshot screen or flameshot full. It shows only the window title of the dialog, the only content is the default background color.

flameshot gui works fine, it shows the file dialog fine.

Steps to reproduce

  1. Run flameshot screen
  2. Stare at frozen dialog for 2 minutes

Screenshots or screen recordings

screenshot_2022-02-19T01:12

System Information

$ inxi --width 80 --system --graphics
System:
  Host: ventiloplattform Kernel: 5.15.19-x86_64 x86_64 bits: 64 Desktop: GNOME
  Distro: Gentoo Base System release 2.7
Graphics:
  Device-1: NVIDIA GK106 [GeForce GTX 660] driver: nvidia v: 470.103.01
  Display: server: X.Org 1.21.1.3 driver: loaded: nvidia
  resolution: 1920x1080~60Hz
  OpenGL: renderer: NVIDIA GeForce GTX 660/PCIe/SSE2
  v: 4.6.0 NVIDIA 470.103.01

Contributor guide

Tech stack
cpp
Domain
desktop
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
C++Qt frameworkLinux environment
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
45
Research direction
Investigate the freeze when running `flameshot screen` or `flameshot full` by comparing the code paths for `flameshot gui`. The issue likely lies in the save dialog rendering or event loop handling. Start by examining the screenshot capture logic in `src/core/` and the dialog creation in `src/utils/`. Look at the comments for any clues about X11 vs Wayland or NVIDIA driver issues. Try to reproduce with a debugger to see where the main thread blocks. Consider testing with different window managers to isolate the problem.