Illustrator prevents Mac display from sleeping due to inactivity
When Illustrator is left open for some time, it prevents my MacBook display from turning off and locking. It also prevents the screensaver from coming on. I am 100% sure this is caused by Illustrator because I have done the following experiment twice:
- Change the screen saver to come on after 1 minute.
- Leave the Mac idle for over 1 minute.
- Screen saver does not start.
- Close Illustrator application.
- Leave the Mac idle again.
- Observe that the screen saver starts and the computer locks after 1 minute.
After restarting Illustrator, the problem goes away for a short time but then starts again. It does not seem to be connected with having an unsaved document open. The last time I tested it, there were no unsaved files.
Mac OS Sonoma 14.6.1
Illustrator 2024 version 28.6
Debbie Cohn
shared this idea
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David Brown
commented
This issue persists in Illustrator 2025 29.71.
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KOICHI
commented
＜バグ報告：Illustrator v29.7.1 がスリープ移行を妨げる問題＞
■環境
ソフトウェア：Illustrator v29.7.1
OS：macOS Sequoia 15.6
ハードウェア：Mac Studio M4 Max（Apple Silicon）■問題
Illustrator起動中に、Macがスリープに移行せず、モニタが点灯し続けるバグが発生。別のスレッド(2025年2月)ではIntel製CPUでのみ発生と記載されていますが、Apple Silicon CPUでも同様の問題が解消されていません。■詳細
アクティビティモニタのスクリーンショットを添付。
非スリープ欄に「はい」の表示が確認できます。
この問題により、システムのスリープ機能が正常に動作せず、作業効率や省電力に影響。早急な対応と修正を希望します。
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Beardmancer
commented
I'm also having this issue on 29.4. In Activity Monitor, under the Energy tab, expanding the entry for Illustrator shows that CEPHtmlEngine is preventing sleep. It keeps my monitors on indefinitely until I quit the app.
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James
commented
This is still real on Sequoia. I did some investigation and found some interesting tidbits. When I used the shell command `pmset -g` this line was in the output:
displaysleep 5 (display sleep prevented by CEPHtmlEngine)
Some poking at the process table pointed a finger at:
/Applications/Adobe Illustrator 2025/Adobe Illustrator.app/Contents/MacOS/CEPHtmlEngine/CEPHtmlEngine.app/Contents/Frameworks/CEPHtmlEngine Helper (GPU).app
I killed all of the (many!) processes running this and the display sleep block had gone away. I didn't need to shut down the main process.