@beijiaoff 我比较好奇苹果为什么这次能做到把延迟压到很难感知到。因为在 macOS 上如果选择 HomePod 作为默认音频输出设备，延迟高达两秒。不管是播放还是暂停还是调音量都是两整秒。

@blufaux 你有一台支持 arc 的电视，一台最新的 Apple TV 和若干 HomePods 。现在所有来自你电视的声音，以及所有接在你电视上的设备（比如 Xbox，ps5 甚至是其他电视盒子）的声音都可以通过 Apple TV 交给 HomePod 播放。
对于家里有很好的音响设备的人来说可能无所谓，但是对于我这种只有一对 HomePod 的人来说实在是太有用了。

@beijiaoff 没错，我非常想拿 HomePod 给 Xbox 做外放。效果肯定比我显示器自带的小喇叭好🤣

@Lemeng 我也心痒痒，但是我平时和舍友在外面住公寓感觉也没什么机会买电视，不知道有没有什么曲线救国的方法让显示器支持 arc 。

@zhaidoudou123 我看 Reddit 上说还是 AirPlay 协议，但是是 HomePod 和 Apple TV 直接建立 Wi-Fi 了。不管怎么样他们就是做到了😂

@yangyang 现在这个功能只能给 HomePod 用，mini 都用不了。所以姑且称之为一个为 HomePod 更新的功能。

根据 Reddit 上多个帖子的反应，拿去和主机搭配打游戏没有问题。
苹果这招也太奇怪了，给一个已经不卖的产品更新了一个早就该有的刚需功能...

@qiaoqiao1235 次世代音频回传是指 eARC 吗？如果是的话，是支持的。

@sreal
@blufaux
苹果香港官网购买然后转运吧，或者直接淘宝买。

@FS1P7dJz
@skyfrere
@alphatoad
@elfive
Reddit 上有一个帖子里有人拿 ps5 测试了 Apple TV arc 的延迟，据他说拿去玩使命召唤都没问题😂
https://www.reddit.com/r/HomePod/comments/nhp9mn/now_the_homepod_is_more_useful_than_ever/gyzhetp/?utm_source=share&utm_medium=ios_app&utm_name=iossmf&context=3

@Dicer0615 缩放掉帧和粉屏我没碰到过。但是进入睡眠模式应该就和我描述的是一样的。mac rumours 上有人说换了显示器解决了，不知道你是什么显示器。

应该是不能的，workaround 是用磁铁骗一下霍尔传感器。

@vate32 Blur 的 ice cream man 国内没有（当然国内没有哪个平台有）。

@jobs0 1000 转的时候基本听不到声音，看监控软件能看到在转。

感觉是风扇策略的问题。今天只是外接了块 4K 显示器加 Matlab 加 Zoom 会议就五十多度了，但是风扇依然是 1000+ 的低速转。

@jbddd 我是直接用 usbc 线连接显示器的，暂时也不太清楚这玩意到底为啥会触发。有时候休眠唤醒就没事，有时候就会崩溃。

corebrightnessd crash log 的一部分
Process: corebrightnessd [9514]
Path: /usr/libexec/corebrightnessd
Identifier: corebrightnessd
Version: 1071.100.69
Code Type: ARM-64 (Native)
Parent Process: launchd [1]
Responsible: corebrightnessd [9514]
User ID: 0

Date/Time: 2021-05-07 19:23:55.294 +0800
OS Version: macOS 11.3.1 (20E241)
Report Version: 12
Anonymous UUID: 8DFE601D-AF09-944E-1DE0-F3D8486ED0FC

Sleep/Wake UUID: CA8835B6-40F5-462F-B9F9-890D3C644942

Time Awake Since Boot: 68000 seconds
Time Since Wake: 47 seconds

System Integrity Protection: enabled

Crashed Thread: 1 Dispatch queue: BacklightControl - Primary

Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY

Application Specific Information:
dyld3 mode
*** Terminating app due to uncaught exception 'NSGenericException', reason: 'SkyLight offline - restart corebrightnessd'
terminating with uncaught exception of type NSException
abort() called

Application Specific Backtrace 1:
0 CoreFoundation 0x00000001951bbdb8 __exceptionPreprocess + 240
1 libobjc.A.dylib 0x0000000194ee50a8 objc_exception_throw + 60
2 CoreFoundation 0x00000001951bbc04 +[NSException exceptionWithName:reason:userInfo:] + 0
3 CoreBrightness 0x000000019fd7eac8 -[BLControl handleSKLClientNotificationWithType:andPayload:] + 624
4 SkyLight 0x0000000199983bf4 -[SLSBrightnessControlClient handleServerMessage:] + 3132
5 SkyLight 0x0000000199a66780 __119-[SLSDisplayControlClient registerDaemonClient:withAutoreconnect:error:notifyQueue:notificationType:notificationBlock:]_block_invoke + 304
6 SkyLight 0x0000000199add91c __107-[SLSXPCService initConnectionWithName:notificationQueue:withAutoreconnect:errorHandler:notificationBlock:]_block_invoke_2 + 40
7 libdispatch.dylib 0x0000000194e8e0f8 _dispatch_call_block_and_release + 32
8 libdispatch.dylib 0x0000000194e8fe90 _dispatch_client_callout + 20
9 libdispatch.dylib 0x0000000194e97678 _dispatch_lane_serial_drain + 620
10 libdispatch.dylib 0x0000000194e98274 _dispatch_lane_invoke + 404
11 libdispatch.dylib 0x0000000194ea2b44 _dispatch_workloop_worker_thread + 764
12 libsystem_pthread.dylib 0x000000019503aff8 _pthread_wqthread + 276
13 libsystem_pthread.dylib 0x0000000195039d30 start_wqthread + 8

Thread 0:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x0000000195004e54 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x0000000195005204 mach_msg + 76
2 com.apple.CoreFoundation 0x000000019513de9c __CFRunLoopServiceMachPort + 372
3 com.apple.CoreFoundation 0x000000019513c368 __CFRunLoopRun + 1212
4 com.apple.CoreFoundation 0x000000019513b734 CFRunLoopRunSpecific + 600
5 com.apple.CoreFoundation 0x00000001951c6754 CFRunLoopRun + 64
6 corebrightnessd 0x0000000102e8b5f4 main + 548
7 libdyld.dylib 0x000000019505c420 start + 4

Thread 1 Crashed:: Dispatch queue: BacklightControl - Primary
0 libsystem_kernel.dylib 0x000000019500ce78 __pthread_kill + 8
1 libsystem_pthread.dylib 0x000000019503eb98 pthread_kill + 292
2 libsystem_c.dylib 0x0000000194f87460 abort + 104
3 libc++abi.dylib 0x0000000194ffdb44 abort_message + 132
4 libc++abi.dylib 0x0000000194feee54 demangling_terminate_handler() + 308
5 libobjc.A.dylib 0x0000000194ee7c94 _objc_terminate() + 144
6 libc++abi.dylib 0x0000000194ffcf2c std::__terminate(void (*)()) + 20
7 libc++abi.dylib 0x0000000194ffceb8 std::terminate() + 48
8 libdispatch.dylib 0x0000000194e8fea4 _dispatch_client_callout + 40
9 libdispatch.dylib 0x0000000194e97678 _dispatch_lane_serial_drain + 620
10 libdispatch.dylib 0x0000000194e98274 _dispatch_lane_invoke + 404
11 libdispatch.dylib 0x0000000194ea2b44 _dispatch_workloop_worker_thread + 764
12 libsystem_pthread.dylib 0x000000019503aff8 _pthread_wqthread + 276
13 libsystem_pthread.dylib 0x0000000195039d30 start_wqthread + 8

WindowServer crash log 的一部分
Process: WindowServer [9515]
Path: /System/Library/PrivateFrameworks/SkyLight.framework/Versions/A/Resources/WindowServer
Identifier: WindowServer
Version: 600.00 (585)
Code Type: ARM-64 (Native)
Parent Process: launchd [1]
Responsible: WindowServer [9515]
User ID: 88

Date/Time: 2021-05-07 19:23:55.293 +0800
OS Version: macOS 11.3.1 (20E241)
Report Version: 12
Anonymous UUID: 8DFE601D-AF09-944E-1DE0-F3D8486ED0FC

Sleep/Wake UUID: CA8835B6-40F5-462F-B9F9-890D3C644942

Time Awake Since Boot: 68000 seconds
Time Since Wake: 47 seconds

System Integrity Protection: enabled

Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Exception Type: EXC_CRASH (SIGKILL)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY

Termination Reason: WATCHDOG, [0x1] monitoring timed out for service
Termination Details: WATCHDOG, checkin with service: WindowServer returned not alive with context:
is_alive_func returned unhealthy : Display 2 not ready:
Display 3 is online and ready.

no successful checkins since wake (40 seconds ago) (0 induced crashes)

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x0000000195004e54 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x0000000195005204 mach_msg + 76
2 com.apple.SkyLight 0x0000000199b92fb8 CGXRunOneServicesPass + 1036
3 com.apple.SkyLight 0x0000000199b94008 server_loop + 128
4 com.apple.SkyLight 0x0000000199b93da8 SLXServer + 1916
5 WindowServer 0x00000001007cf328 0x1007cc000 + 13096
6 libdyld.dylib 0x000000019505c420 start + 4

@blufaux 转头声音会变是因为转头后很容易漏出个口子来，密封被破坏了。这一点做的非常糟糕。