Google TV: Ambient Mode is the screensaver
On Google TV there is no "screensaver" menu. What idles on screen is Ambient Mode, and Google reserves it for its own sources.
Go to Settings → System → Ambient mode → Source. You get three choices: Google Photos, Art gallery (Google's own curated set), and an Experimental option. Third-party apps do not appear in that list, which is the single most common reason people conclude their screensaver app is broken when it is installed correctly.
Android TV: the classic screensaver menu
Older Android TV builds keep the standard
Android daydream picker. Go to Settings → Device Preferences → Screen saver.
Any installed app that registers a DreamService shows up here, so you can select it
directly. You can also set how long the TV waits before it starts.
Using a third-party screensaver on Google TV
Two routes work, and neither requires rooting the TV.
A launcher that exposes the setting
Replacement launchers such as Projectivy Launcher or FLauncher add a screensaver override that Google TV itself does not offer. Install one, then look for Settings → Screensaver Override and pick the app you want.
One ADB command
If you would rather not change launcher, you can set it once over ADB. First enable developer options: Settings → System → About, then click Android TV OS build seven times. Then turn on Wireless debugging under Developer options, and from a computer on the same network:
adb connect <tv-ip>:5555
adb shell settings put secure screensaver_components <package>/<service>
adb shell settings put secure screensaver_enabled 1
Test it immediately rather than waiting for the idle timer:
adb shell cmd dreams start-dreaming
This survives reboots. It does not always survive a system update, so keep the command somewhere you can find it again.
Turning the screensaver off
On Google TV, Settings → System → Ambient mode and set the timer to Off, or set the source to something you do not mind seeing. On Android TV, Settings → Device Preferences → Screen saver → When to start and choose Never. Note that many TVs have a separate panel-level sleep timer; turning off the screensaver does not stop the TV switching itself off.
Common questions
Why can't I select my screensaver app on Google TV?
How do I change the screensaver on Android TV?
Does changing the screensaver over ADB survive a reboot?
Can I use my own photos as the screensaver?
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