Add debug flag to re-enable wl_drm

7e69a7076fc8 ("Drop wl_drm") has dropped wl_drm, however a lot of
software wasn't quite ready for this (Xwayland, libva, amdvlk).
Keep wl_drm disabled by default to pressure the wl_drm phase-out,
but add a -Dlegacy-wl-drm flag for users to restore the previous
behavior in the meantime.

References: https://github.com/swaywm/sway/issues/7897

1 files changed, 2 insertions, 0 deletions

diff --git a/sway/main.c b/sway/main.c
index 21f19fc4..73254dc2 100644
--- a/sway/main.c
+++ b/sway/main.c
@@ -162,6 +162,8 @@ void enable_debug_flag(const char *flag) {
                 debug.txn_timings = true;
         } else if (strncmp(flag, "txn-timeout=", 12) == 0) {
                 server.txn_timeout_ms = atoi(&flag[12]);
+        } else if (strcmp(flag, "legacy-wl-drm") == 0) {
+                debug.legacy_wl_drm = true;
         } else {
                 sway_log(SWAY_ERROR, "Unknown debug flag: %s", flag);
         }