kms: Fix VT switching back to cosmic

src/backend/kms/mod.rs

@@ -174,6 +174,7 @@ pub fn init_backend(event_loop: &mut EventLoop<'static, State>, state: &mut Stat
         .unwrap();
  
     let handle = event_loop.handle();
+    let loop_signal = state.common.event_loop_signal.clone();
     let dispatcher = udev_dispatcher.clone();
     let _restart_token = signaler.register(move |signal| {
         if let Signal::ActivateSession = signal {
@@ -205,10 +206,14 @@ pub fn init_backend(event_loop: &mut EventLoop<'static, State>, state: &mut Stat
                 state.common.shell.refresh_outputs();
                 state.common.config.write_outputs(state.common.output_conf.outputs());
 
+                for surface in state.backend.kms().devices.values_mut().flat_map(|d| d.surfaces.values_mut()) {
+                    surface.pending = false;
+                }
                 for output in state.common.shell.outputs() {
                     state.backend.kms().schedule_render(output);
                 }
             });
+            loop_signal.wakeup();
         }
     });
         

src/main.rs

@@ -30,18 +30,17 @@ fn main() -> Result<()> {
     // init wayland
     let (display, socket) = init_wayland_display(&mut event_loop)?;
     // init state
-    let mut state = state::State::new(display, socket, event_loop.handle(), log);
+    let mut state = state::State::new(display, socket, event_loop.handle(), event_loop.get_signal(), log);
     // init backend
     backend::init_backend_auto(&mut event_loop, &mut state)?;
 
     // run the event loop
-    let signal = event_loop.get_signal();
     event_loop.run(None, &mut state, |state| {
         // shall we shut down?
         if state.common.shell.outputs().next().is_none() || state.common.should_stop {
             slog_scope::info!("Shutting down");
-            signal.stop();
-            signal.wakeup();
+            state.common.event_loop_signal.stop();
+            state.common.event_loop_signal.wakeup();
             return;
         }
 

src/state.rs

@@ -8,7 +8,7 @@ use crate::{
 };
 use smithay::{
     reexports::{
-        calloop::LoopHandle,
+        calloop::{LoopHandle, LoopSignal},
         wayland_server::{protocol::wl_surface::WlSurface, Display},
     },
     wayland::{
@@ -47,6 +47,7 @@ pub struct Common {
     pub display: Rc<RefCell<Display>>,
     pub socket: OsString,
     pub event_loop_handle: LoopHandle<'static, State>,
+    pub event_loop_signal: LoopSignal,
 
     pub output_conf: ConfigurationManager,
     pub shell: Shell,
@@ -182,6 +183,7 @@ impl State {
         mut display: Display,
         socket: OsString,
         handle: LoopHandle<'static, State>,
+        signal: LoopSignal,
         log: LogState,
     ) -> State {
         let config = Config::load();
@@ -326,6 +328,7 @@ impl State {
                 display: Rc::new(RefCell::new(display)),
                 socket,
                 event_loop_handle: handle,
+                event_loop_signal: signal,
 
                 output_conf,
                 shell,