Remove logind-zbus dependency

It isn't updated and we don't really need it anyway.

Cargo.lock

@@ -1879,16 +1879,6 @@ version = "0.4.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
 
-[[package]]
-name = "logind-zbus"
-version = "3.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c07a2542f6e91ea92780158654852190edb2ba0b232d9d00d649d0c691cb7eb3"
-dependencies = [
- "serde",
- "zbus",
-]
-
 [[package]]
 name = "loom"
 version = "0.7.1"
@@ -2062,7 +2052,6 @@ dependencies = [
  "keyframe",
  "libc",
  "log",
- "logind-zbus",
  "niri-config",
  "niri-ipc",
  "notify-rust",

Cargo.toml

@@ -54,7 +54,6 @@ input = { version = "0.9.0", features = ["libinput_1_21"] }
 keyframe = { version = "1.1.1", default-features = false }
 libc = "0.2.153"
 log = { version = "0.4.20", features = ["max_level_trace", "release_max_level_debug"] }
-logind-zbus = { version = "3.1.2", optional = true }
 niri-config = { version = "0.1.1", path = "niri-config" }
 niri-ipc = { version = "0.1.1", path = "niri-ipc", features = ["clap"] }
 notify-rust = { version = "4.10.0", optional = true }
@@ -99,7 +98,7 @@ proptest-derive = "0.4.0"
 [features]
 default = ["dbus", "xdp-gnome-screencast"]
 # Enables DBus support (required for xdp-gnome and power button inhibiting).
-dbus = ["zbus", "logind-zbus", "async-channel", "async-io", "notify-rust", "url"]
+dbus = ["zbus", "async-channel", "async-io", "notify-rust", "url"]
 # Enables screencasting support through xdg-desktop-portal-gnome.
 xdp-gnome-screencast = ["dbus", "pipewire"]
 # Enables the Tracy profiler instrumentation.

src/backend/tty.rs

@@ -1509,9 +1509,17 @@ fn refresh_interval(mode: DrmMode) -> Duration {
 #[cfg(feature = "dbus")]
 fn suspend() -> anyhow::Result<()> {
     let conn = zbus::blocking::Connection::system().context("error connecting to system bus")?;
-    let manager = logind_zbus::manager::ManagerProxyBlocking::new(&conn)
-        .context("error creating login manager proxy")?;
-    manager.suspend(true).context("error suspending")
+
+    conn.call_method(
+        Some("org.freedesktop.login1"),
+        "/org/freedesktop/login1",
+        Some("org.freedesktop.login1.Manager"),
+        "Suspend",
+        &(true),
+    )
+    .context("error suspending")?;
+
+    Ok(())
 }
 
 fn queue_estimated_vblank_timer(