wlroots/include
Johan Malm 175c20d954 Revert removal of automatic drm reset on VT switch
...on the basis that it reduces user-space breakage with respect to
layer-shell clients disappearing on suspend/resume and on VT change.

Revert the following two commits:

- 1edd5e2  "backend/drm: Remove reset from interface"
- 0f255b4  "backend/drm: Remove automatic reset on VT switch"

This it not intended to be reverted on the `master` branch. Instead, the
next wlroots release is anticipated to handle the situation differently,
possibly by splitting some objects and leaving output-related wl_globals
which have been announced to clients. See discussions on [issue-3944].

[issue-3944]: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3944#note_3030632

Background:

With [MR-4878] on wlroots-0.19.0, the DRM backend destroys/recreates
outputs on VT switch and in some cases on suspend/resume too. The reason
for this change was that (i) the KMS state is undefined when a VT is
switched away; and (ii) the previous outputs had issues with restoration,
particularly when the output configuration had changed whilst switched
away. This change causes two issues for users:

- Some layer-shell clients do not re-appear on output re-connection, or
  may appear on a different output. Whilst this has always been the case,
  it will now also happen in said situations. It is technically possible
  for layer-shell clients to deal with this more thoughtfully by handling
  the new-output and surface-destroy signals to achieve desired
  behaviours, but such changes take time and meanwhile Desktop Environment
  teams and other users consider this a serious regression.

- Some Gtk clients issue critical warnings on some compositors as they
  assume that at least one output is always available. This will be fixed
  in `Gtk-3.24.50` and is believed to be a harmless warning,

[MR-4878]: https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/4878

Testing:

1. This reversion has been tested with [conky] and [GlassyClock]. With the
reversion applied, the clients remain visible after VT switching.
2. It was also tested with labwc on tty1; and sway on tty2. No adverse
affects were observed when changing output scales on either compositor.

[conky]: https://github.com/brndnmtthws/conky
[GlassyClock]: https://github.com/tsujan/GlassyClock
2025-08-03 13:01:45 +01:00
..
backend Revert removal of automatic drm reset on VT switch 2025-08-03 13:01:45 +01:00
interfaces types/wlr_input_device: move init and finish function to private API 2022-03-07 16:37:41 +00:00
render Fix/cleanup includes a bit 2025-04-15 20:13:29 +03:00
types Revert "wlr_keyboard: don't emit key event for duplicated keycodes" 2025-04-25 03:23:21 +09:00
util util/matrix: add matrix_invert() 2025-03-30 16:21:26 +02:00
wlr xwayland: handle unset _NET_WM_NAME 2025-05-15 10:23:01 +02:00
xcursor Add some missing includes/declarations 2023-06-05 21:06:19 +00:00
xwayland xwm: Handle NET_WM_WINDOW_OPACITY 2025-03-06 14:18:20 +00:00
meson.build render/color: add fallback stub when LCMS2 is disabled 2024-06-04 17:45:51 +00:00