{"id":20059,"date":"2026-01-19T07:22:55","date_gmt":"2026-01-19T12:22:55","guid":{"rendered":"https:\/\/nuxx.net\/blog\/?p=20059"},"modified":"2026-01-19T07:22:57","modified_gmt":"2026-01-19T12:22:57","slug":"adobe-illustrator-preventing-macos-sleep","status":"publish","type":"post","link":"https:\/\/nuxx.net\/blog\/2026\/01\/19\/adobe-illustrator-preventing-macos-sleep\/","title":{"rendered":"Adobe Illustrator Preventing macOS Sleep?"},"content":{"rendered":"\n<p>Ever since getting my new monitor (a <a href=\"https:\/\/www.dell.com\/en-us\/shop\/dell-ultrasharp-32-4k-thunderbolt-hub-monitor-u3225qe\/apd\/210-bqhs\/monitors-monitor-accessories\">Dell U3225QE<\/a> &#8212; a <a href=\"https:\/\/nuxx.net\/blog\/2026\/01\/09\/oled-not-for-me\/\" data-type=\"post\" data-id=\"20042\">nice IPS LCD after some OLED issues<\/a>) I&#8217;ve been having problems with it not going to sleep. But that&#8217;s not usually a monitor problem, especially as I could manually put it to sleep&#8230; So what&#8217;s keeping macOS from putting it to sleep?<\/p>\n\n\n\n<p>Well, thankfully with <code>pmset<\/code> one can see what&#8217;s going on:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>c0nsumer@mini ~ % pmset -g\nSystem-wide power settings:\nCurrently in use:\nstandby 0\nSleep On Power Button 1\nautorestart 0\npowernap 1\nnetworkoversleep 0\ndisksleep 10\nsleep 0 (sleep prevented by backupd-helper, powerd, backupd, coreaudiod, coreaudiod)\nttyskeepawake 1\n<strong>displaysleep 10 (display sleep prevented by CEPHtmlEngine)<\/strong>\ntcpkeepalive 1\npowermode 0\nwomp 1\nc0nsumer@mini ~ %<\/code><\/pre>\n\n\n\n<p>There we go, seems <code>CEPHtmlEngine<\/code> is preventing the display from sleeping. So what is it?<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>c0nsumer@mini ~ % pmset -g assertions | grep CEPHtmlEngine\n<strong>pid 15995(CEPHtmlEngine): &#91;0x00038aae00059926] 46:44:27 NoDisplaySleepAssertion named: \"Video Wake Lock\"<\/strong>\nc0nsumer@mini ~ % ps aux | grep 15995\nc0nsumer <strong>15995<\/strong> 3.4 0.1 412316000 64256 ?? R Sat08AM 128:30.24 \/Applications\/Adobe Illustrator 2025\/<strong>Adobe Illustrator.app<\/strong>\/Contents\/MacOS\/CEPHtmlEngine\/CEPHtmlEngine.app\/Contents\/MacOS\/CEPHtmlEngine b27716d6-c14c-49e4-8612-b5ab9de9bdf4 1103d4a0-8756-40b2-af81-5646ba80756f ILST 29.8.4 com.adobe.illustrator.OnBoarding 1 \/Applications\/Adobe Illustrator 2025\/Adobe Illustrator.app\/Contents\/Required\/CEP\/extensions\/com.adobe.illustrator.OnBoarding 32 e30= en_US 1 -11316397 0\nc0nsumer 58444 0.0 0.0 410724448 1472 s002 S+ 7:14AM 0:00.00 grep 15995\nc0nsumer@mini ~ %<\/code><\/pre>\n\n\n\n<p>Really? <a href=\"https:\/\/en.wikipedia.org\/wiki\/Adobe_Illustrator\">Illustrator<\/a>? Huh&#8230; I have been working on a new map of <a href=\"https:\/\/www.rochesterhills.org\/departments\/parks_and_natural_resources\/trailsandparks\/bloomeryatesparks.php\">Bloomer Park<\/a> (in anticipation of the forthcoming <a href=\"https:\/\/www.oakgov.com\/community\/oakland-county-parks\/get-involved\/planning\/major-park-improvement-projects\/rochester-hills\">Clinton River Oaks Park<\/a> changes) for <a href=\"https:\/\/cramba.org\">CRAMBA<\/a> and leaving it open in the background&#8230; I guess that&#8217;s it.<\/p>\n\n\n\n<p>And strangely, closing and re-launching Illustrator made the assertion go away. And now the problem is gone.<\/p>\n\n\n\n<p>Oh, Adobe&#8230;<\/p>\n\n\n\n<p>At least it&#8217;s easy to tell why it was happening.<\/p>\n\n\n\n<p>(This is Adobe Illustrator v29.8.4 on macOS Sequoia 15.7.3.)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ever since getting my new monitor (a Dell U3225QE &#8212; a nice IPS LCD after some OLED issues) I&#8217;ve been having problems with it not&#8230;<\/p>\n<div class=\"more-link-wrapper\"><a class=\"more-link\" href=\"https:\/\/nuxx.net\/blog\/2026\/01\/19\/adobe-illustrator-preventing-macos-sleep\/\">Continue reading<span class=\"screen-reader-text\">Adobe Illustrator Preventing macOS Sleep?<\/span><\/a><\/div>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[],"class_list":["post-20059","post","type-post","status-publish","format-standard","hentry","category-computers","entry"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts\/20059","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/comments?post=20059"}],"version-history":[{"count":1,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts\/20059\/revisions"}],"predecessor-version":[{"id":20060,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts\/20059\/revisions\/20060"}],"wp:attachment":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/media?parent=20059"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/categories?post=20059"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/tags?post=20059"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}