Question 131219 in Xcode Question posted in
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Xcode – CVDisplayLink debug messages

Since Xcode 13.2.1 I get flooded with CVDisplayLink debug / warning messages.

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CVDisplayLink::start
CVDisplayLink::stop

20 times a second or so.

I think they may come from an WebView which runs an embedded version of the Ace editor.

Does anybody know how to prevent the CVDisplayLink messages specifically ?

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3

Answers


  1. 0

    I get these messages too and also think it has to do with WKWebview.

    My only workaround for now is trying to silence them with: OS_ACTIVITY_MODE = disable on the Scheme.

    1

    On Xcode go to Product > Scheme > Edit Scheme

    2

    On Run > Arguments add the Environment Variable:

    OS_ACTIVITY_MODE and set the Value to disable

    Editing the scheme to add environment variable

    These debug messages should not be there next time you run the app.

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  2. 0

    Unfortunately disabling OS_ACTIVITY_MODE disables all system logs output including os_log(..)

    I found a better solution:

    CFPreferencesSetValue("cv_note" as CFString, 0 as CFPropertyList, "com.apple.corevideo" as CFString, kCFPreferencesCurrentUser, kCFPreferencesAnyHost)
CFPreferencesSynchronize("com.apple.corevideo" as CFString, kCFPreferencesCurrentUser, kCFPreferencesAnyHost)
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  3. 0

    The easiest way to disable the messages is to execute the following command in Terminal:

    defaults write com.apple.corevideo cv_note 0

    (Credits for figuring out the keys go to Alexey Martemyanov’s answer!)

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