Fix segfault in wlr_output_manager_v1_set_configuration

Calling wlr_output_manager_v1_set_configuration with an enabled output
and a NULL mode is incorrect if the output doesn't support modes.

When DPMS'ing an output, wlr_output_enable(output, false) is called.
This de-allocates the CRTC and sets wlr_output.current_mode to NULL.

Because we mark DPMS'ed outputs as enabled, we also need to provide a
correct output mode. Add a field to sway_output to hold the current
mode.

Closes: https://github.com/swaywm/wlroots/issues/1867

1 files changed, 1 insertions, 0 deletions

diff --git a/sway/config/output.c b/sway/config/output.c
index 3c36692f..50bf1155 100644
--- a/sway/config/output.c
+++ b/sway/config/output.c
@@ -278,6 +278,7 @@ bool apply_output_config(struct output_config *oc, struct sway_output *output) {
                 sway_log(SWAY_ERROR, "Failed to modeset output %s", wlr_output->name);
                 return false;
         }
+        output->current_mode = wlr_output->current_mode;
 
         if (oc && oc->scale > 0) {
                 sway_log(SWAY_DEBUG, "Set %s scale to %f", oc->name, oc->scale);