reconfigure_screens config and functionality are buggy

[ervinpopescu]

Issue description

After a change was done to the screens configuration (monitor added and autorandr run), the following was the state:

This is probably related to the scale applied to the external monitors, as my laptop is HiDPI and the monitors are not.

After reloading the config, everything is configured correctly.

autorandr profile: https://termbin.com/167h

The number of No screen at target errors is 3 times less the number of times the actual screen_change hook is fired by the way, since I could see the config reloading 12 times, hook which for some reason also triggers the screens_reconfigured hook just twice, since I can see only 2 notifications.

Scratch that, the behavior is random, except for the No screen at target errors which seem to be 4 all the time.

Version

0.24.1.dev11+g00dcf122

Backend

X11 (default)

Config

reconfigure_screens = True

@hook.subscribe.screen_change
def reload(event):
    qtile.reload_config()

@hook.subscribe.screens_reconfigured
def change_wallpaper():
    send_notification("qtile", "screen change detected.")
    with open(os.path.expanduser("~/.local/share/wallpaper/log")) as f:
        path = f.readlines()[0].split(" ")[-1]
    subprocess.call(f"run_wall.sh {path} all".split())

Logs

2024-01-29 00:47:29,410 ERROR libqtile window.py:update_strut():L1637 No screen at target
2024-01-29 00:47:31,603 ERROR libqtile window.py:update_strut():L1637 No screen at target
2024-01-29 00:47:31,604 ERROR libqtile window.py:update_strut():L1637 No screen at target
2024-01-29 00:47:31,606 ERROR libqtile window.py:update_strut():L1637 No screen at target
2024-01-29 00:47:44,518 ERROR libqtile loop.py:_handle_exception():L62 Exception in event loop:
Traceback (most recent call last):
  File "/usr/lib/python3.11/asyncio/events.py", line 80, in _run
    self._context.run(self._callback, *self._args)
  File "/usr/lib/python3.11/site-packages/libqtile/core/manager.py", line 945, in f
    func(*args)
  File "/usr/lib/python3.11/site-packages/libqtile/widget/base.py", line 627, in draw
    self.drawer.clear(self.background or self.bar.background)
  File "/usr/lib/python3.11/site-packages/qtile_extras/widget/decorations.py", line 832, in new_clear
    self._pre_clear(colour)
  File "/usr/lib/python3.11/site-packages/libqtile/backend/base/drawer.py", line 307, in clear
    self.ctx.save()
    ^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'save'
x144

Required

• I have searched past issues to see if this bug has already been reported, and it hasn't been.
• I understand that people give their precious time for free, and thus I've done my very best to make this problem as easy as possible to investigate.

[elParaguayo]

I agree it's buggy and will try to take a look.

I know there have been issues with autorandr before.

[ervinpopescu]

Thanks! Let me know if and how I can help.

[elParaguayo]

What's the actual issue shown in the screenshot? Is it the positioning of the screens?

I doubt the qtile-extras decoration issue is relevant here (I've seen it at other times too) but the lines above may be more interesting.

[ervinpopescu]

What's the actual issue shown in the screenshot? Is it the positioning of the screens?

Yes, Qtile does not seem to understand the different scale and positions the external monitors at half of their physical width. You can see the background behind which is correctly set using nitrogen in a custom script.

I doubt the qtile-extras decoration issue is relevant here (I've seen it at other times too) but the lines above may be more interesting.

Indeed, I am going to turn debug logging on and test again, in hopes of some more useful logs.

[github-actions]

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