Open Radar

 
Summary:

When downloading a large application from the Mac App Store, the download is interrupted by user-idle sleep. This is extremely annoying and contrary to user expectation.


Steps to Reproduce:

* Check that idle sleep is configured on the Mac in question.
* Initiate download of a large application, such as Xcode or an OS X installer, while connected to the internet via a connection that will not allow the download to complete within the idle sleep time.
* Stop using the computer and wait for the download to progress.


Expected Results:

* Mac should eventually dim its screen but not go into system standby until the download has completed.


Actual Results:

* Mac eventually goes into system sleep.
* If you wake the Mac, you will notice that the download has failed with an error.

If you check power assertions during a running app download:

# pmset -g assertions
[…]
Assertion status system-wide:
   PreventUserIdleDisplaySleep    0
   PreventSystemSleep             0
   PreventUserIdleSystemSleep     0
   ExternalMedia                  0
   UserIsActive                   0
   ApplePushServiceTask           0
   BackgroundTask                 0
[…]

There should be a PreventUserIdleSystemSleep assertion!


Regression:

I don't think the Mac App Store application has worked properly since it launched; I have only specifically tested power assertions on OS X 10.8.4, however. It should be noted that Safari and other browsers correctly create a power assertion while downloading files.


Notes:

Assertions during a Safari download:

# pmset -g assertions
08/08/2013 12:18:40 CEST 
Assertion status system-wide:
   PreventUserIdleDisplaySleep    0
   PreventSystemSleep             0
   PreventUserIdleSystemSleep     1
   ExternalMedia                  0
   UserIsActive                   0
   ApplePushServiceTask           0
   BackgroundTask                 0
[…]