37.7 not allowing screen saver to start



  • Immediately after updating to 37.7 I had to start using a hot corner to start a screen saver.

    Mac Mini (Late 2014)
    OS v10.11.6
    2.6Ghz i5
    8GB RAM
    Intel Iris 1536 MB


  • f.lux team

    Can you type this into Terminal to check if there is anything else making this happen?

    pmset -g assertions



  • 2016-08-23 21:12:28 -0400
    Assertion status system-wide:
    BackgroundTask 0
    ApplePushServiceTask 0
    UserIsActive 1
    PreventUserIdleDisplaySleep 1
    PreventSystemSleep 0
    ExternalMedia 1
    PreventUserIdleSystemSleep 0
    NetworkClientActive 1
    Listed by owning process:
    pid 30579(firefox): [0x0010cc8e00050423] 52:30:42 NoDisplaySleepAssertion named: "screen"
    pid 55(powerd): [0x000000220008012d] 358:20:03 ExternalMedia named: "com.apple.powermanagement.externalmediamounted"
    pid 14311(iTunes): [0x0013a6dc001124e2] 00:34:35 NetworkClientActive named: "com.apple.iTunes.server"
    pid 35299(rcd): [0x00139dfb00092454] 01:12:28 UserIsActive named: "com.apple.rcdevent"
    Timeout will fire in 2852 secs Action=TimeoutActionRelease
    pid 35299(rcd): [0x00139e0300092457] 01:12:20 UserIsActive named: "com.apple.rcdevent"
    Timeout will fire in 2859 secs Action=TimeoutActionRelease
    pid 35299(rcd): [0x0013a2e300092493] 00:51:32 UserIsActive named: "com.apple.rcdevent"
    Timeout will fire in 4107 secs Action=TimeoutActionRelease
    pid 35299(rcd): [0x0013a30600092497] 00:50:57 UserIsActive named: "com.apple.rcdevent"
    Timeout will fire in 4142 secs Action=TimeoutActionRelease
    pid 35299(rcd): [0x0013a3360009249d] 00:50:09 UserIsActive named: "com.apple.rcdevent"
    Timeout will fire in 4190 secs Action=TimeoutActionRelease
    pid 35299(rcd): [0x0013a3480009249f] 00:49:51 UserIsActive named: "com.apple.rcdevent"
    Timeout will fire in 4208 secs Action=TimeoutActionRelease
    pid 35299(rcd): [0x0013a362000924a2] 00:49:25 UserIsActive named: "com.apple.rcdevent"
    Timeout will fire in 4234 secs Action=TimeoutActionRelease
    pid 35299(rcd): [0x0013a374000924a5] 00:49:07 UserIsActive named: "com.apple.rcdevent"
    Timeout will fire in 4253 secs Action=TimeoutActionRelease
    pid 35299(rcd): [0x0013a393000924a7] 00:48:36 UserIsActive named: "com.apple.rcdevent"
    Timeout will fire in 4283 secs Action=TimeoutActionRelease
    pid 35299(rcd): [0x0013a3a0000924a9] 00:48:24 UserIsActive named: "com.apple.rcdevent"
    Timeout will fire in 4296 secs Action=TimeoutActionRelease
    pid 35299(rcd): [0x0013a3af000924ae] 00:48:08 UserIsActive named: "com.apple.rcdevent"
    Timeout will fire in 4312 secs Action=TimeoutActionRelease
    pid 35299(rcd): [0x0013a3b5000924b0] 00:48:02 UserIsActive named: "com.apple.rcdevent"
    Timeout will fire in 4317 secs Action=TimeoutActionRelease
    pid 35299(rcd): [0x0013a3d3000924b2] 00:47:32 UserIsActive named: "com.apple.rcdevent"
    Timeout will fire in 4347 secs Action=TimeoutActionRelease
    pid 35299(rcd): [0x0013a3e8000924b4] 00:47:11 UserIsActive named: "com.apple.rcdevent"
    Timeout will fire in 4369 secs Action=TimeoutActionRelease
    pid 35299(rcd): [0x0013a643000924d8] 00:37:08 UserIsActive named: "com.apple.rcdevent"
    Timeout will fire in 4972 secs Action=TimeoutActionRelease
    pid 35299(rcd): [0x0013aa7500092511] 00:19:14 UserIsActive named: "com.apple.rcdevent"
    Timeout will fire in 6045 secs Action=TimeoutActionRelease
    pid 35299(rcd): [0x0013aa7c00092513] 00:19:07 UserIsActive named: "com.apple.rcdevent"
    Timeout will fire in 6053 secs Action=TimeoutActionRelease
    pid 35299(rcd): [0x0013aa8400092514] 00:18:59 UserIsActive named: "com.apple.rcdevent"
    Timeout will fire in 6060 secs Action=TimeoutActionRelease
    pid 102(hidd): [0x0013aaae00092517] 00:18:17 UserIsActive named: "com.apple.iohideventsystem.queue.tickle"
    Timeout will fire in 6551 secs Action=TimeoutActionRelease
    Kernel Assertions: 0x10c=USB,BT-HID,MAGICWAKE
    id=503 level=255 0x4=USB mod=12/31/69, 7:00 PM description=com.apple.usb.externaldevice.14a00000 owner=My Book 1230
    id=504 level=255 0x100=MAGICWAKE mod=8/21/16, 10:11 AM description=en1 owner=en1
    id=505 level=255 0x8=BT-HID mod=12/31/69, 7:00 PM description=com.apple.driver.IOBluetoothHIDDriver owner=BNBMouseDevice
    id=508 level=255 0x4=USB mod=12/31/69, 7:00 PM description=com.apple.usb.externaldevice.14b00000 owner=BUP Slim BK
    id=512 level=255 0x4=USB mod=12/31/69, 7:00 PM description=com.apple.usb.externaldevice.14100000 owner=Keyboard Hub
    Idle sleep preventers: IODisplayWrangler


  • f.lux team

    I think this Firefox is preventing sleep:

    pid 30579(firefox): [0x0010cc8e00050423] 52:30:42 NoDisplaySleepAssertion named: "screen"

    Is it possible you have a tab playing video, or something like that? It's potentially possible that there is some interaction between Firefox and f.lux (but I just tried it and couldn't make it happen - my display went to sleep with both running).



  • As a matter of fact, yes. I'm working on an HTML5 version of a website and the landing page has a movie background that plays. I'm using wix.com so its a prefab page that I modified slightly.

    I tried a couple of things and confirmed its that movie playing in FireFox. I stopped the movie playing and the screen saver started. I played the movie and the screen saver did not start. I was on FF v48.0. When I looked at the About dialog box it showed an update was available. I updated to 48.0.1 and tried the same again. I got the same results.

    When Firefox is playing a movie the screen saver doesn't start.

    Please let me know if I can provide more information to help.

    Thanks for your help!



  • @mgregclark Firefox itself is preventing the screen saver from playing when the video plays



  • Yes. That is what I found. Once I closed the tab with that video the screen saver and f.lux works as they should.