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Apple Computing Products:
macOS - Operating System
macOS stutters every 2 seconds when an external monitor is plugged in
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<blockquote data-quote="DiPech" data-source="post: 1852659" data-attributes="member: 404669"><p>I’ve bought a new Macbook Pro 16”. There is stuttering right after I have my external monitor plugged in. Stuttering is observed on both displays (on the internal Retina and on the external LG display) while having connected the external LG display. Stuttering stops immediately right after ejecting the LG display.</p><p></p><p>There are two videos I’ve recorded to show this problem (3 stutters during two 6-seconds videos):</p><p><a href="https://youtu.be/D5czg8gdKh4" target="_blank">YouTube</a> – Stuttering when moving a window.</p><p><a href="https://youtu.be/b4PGSEXCvMc" target="_blank">YouTube</a> – Stuttering when selecting a text.</p><p></p><p><strong>My specs:</strong></p><ul> <li data-xf-list-type="ul">Notebook: Macbook Pro 16” 2019, 8-Core Intel Core i9, 16 GB RAM, 1TB SSD, Intel UHD Graphics 630, AMD Radeon Pro 5500M (4GB).</li> <li data-xf-list-type="ul">External Monitor: LG 29UM69G 29”.</li> <li data-xf-list-type="ul">OS Version: Catalina, 10.15.5 (19F101).</li> <li data-xf-list-type="ul">Periphery: Magic Keyboard 2, Magic Mouse 2, USB 2.0 no-name Mouse, original Apple USB-C to USB-C 0.8M cable (Apple Thunderbolt 3), HDMI to HDMI cable through original 3-in-1 adapter USB-C to [ USB-C, HDMI, USB 2.0 ].</li> </ul><p></p><p></p><p><strong>What doesn’t help at all:</strong></p><ul> <li data-xf-list-type="ul">Installing the last update.</li> <li data-xf-list-type="ul">Connecting through USB-C-to-USB-C Thunderbolt 3 cable (instead of HDMI-to-HDMI plus HDMI-to-USB-C connector) – I’ve bought it just for solving this issue.</li> <li data-xf-list-type="ul">Resetting SMC and NVRAM.</li> <li data-xf-list-type="ul">Using another (new) user profile.</li> <li data-xf-list-type="ul">Closing the lid and working only with the external display.</li> <li data-xf-list-type="ul">Having both displays working but showing separate desktops.</li> <li data-xf-list-type="ul">Having both displays working with turned on displays mirroring.</li> <li data-xf-list-type="ul">Setting custom scaling (also tried choosing custom scaling by pressing Option key).</li> <li data-xf-list-type="ul">Using the built-in trackpad.</li> <li data-xf-list-type="ul">Turning off Bluetooth.</li> <li data-xf-list-type="ul">Using no-name USB2.0 wired mouse.</li> <li data-xf-list-type="ul">Removing mouse and trackpad plists from Libraries/Preferences folder.</li> <li data-xf-list-type="ul">The Diagnostic Tool (by pressing D) shows “No Issues Found”.</li> <li data-xf-list-type="ul">The Disk Utility Tool (by pressing Cmd + R) shows “No Issues Found”.</li> </ul><p></p><p></p><p><strong>What helps (but these are not solutions):</strong></p><ul> <li data-xf-list-type="ul">Eject external display.</li> <li data-xf-list-type="ul">Using Bootcamp (this problem is not observed there at all).</li> <li data-xf-list-type="ul">Booting in Safe Mode (by pressing Shift after starting a computer).</li> <li data-xf-list-type="ul">Using my previous MacBook Pro 2015 15” (which also works under the last Catalina version) with the LG display.</li> </ul><p></p><p><u>Please, don’t offer these possible solutions, they aren’t acceptable for me:</u></p><ul> <li data-xf-list-type="ul">Return the MacBook to the store.</li> <li data-xf-list-type="ul">Reinstall macOS from scratch.</li> </ul><p></p><p><em>P.S. AppleCare support doesn't help me <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" /></em></p><p></p><p>Please, can anybody help with it?</p></blockquote><p></p>
[QUOTE="DiPech, post: 1852659, member: 404669"] I’ve bought a new Macbook Pro 16”. There is stuttering right after I have my external monitor plugged in. Stuttering is observed on both displays (on the internal Retina and on the external LG display) while having connected the external LG display. Stuttering stops immediately right after ejecting the LG display. There are two videos I’ve recorded to show this problem (3 stutters during two 6-seconds videos): [url=https://youtu.be/D5czg8gdKh4]YouTube[/url] – Stuttering when moving a window. [url=https://youtu.be/b4PGSEXCvMc]YouTube[/url] – Stuttering when selecting a text. [B]My specs:[/B] [LIST] [*]Notebook: Macbook Pro 16” 2019, 8-Core Intel Core i9, 16 GB RAM, 1TB SSD, Intel UHD Graphics 630, AMD Radeon Pro 5500M (4GB). [*]External Monitor: LG 29UM69G 29”. [*]OS Version: Catalina, 10.15.5 (19F101). [*]Periphery: Magic Keyboard 2, Magic Mouse 2, USB 2.0 no-name Mouse, original Apple USB-C to USB-C 0.8M cable (Apple Thunderbolt 3), HDMI to HDMI cable through original 3-in-1 adapter USB-C to [ USB-C, HDMI, USB 2.0 ]. [/LIST] [B]What doesn’t help at all:[/B] [LIST] [*]Installing the last update. [*]Connecting through USB-C-to-USB-C Thunderbolt 3 cable (instead of HDMI-to-HDMI plus HDMI-to-USB-C connector) – I’ve bought it just for solving this issue. [*]Resetting SMC and NVRAM. [*]Using another (new) user profile. [*]Closing the lid and working only with the external display. [*]Having both displays working but showing separate desktops. [*]Having both displays working with turned on displays mirroring. [*]Setting custom scaling (also tried choosing custom scaling by pressing Option key). [*]Using the built-in trackpad. [*]Turning off Bluetooth. [*]Using no-name USB2.0 wired mouse. [*]Removing mouse and trackpad plists from Libraries/Preferences folder. [*]The Diagnostic Tool (by pressing D) shows “No Issues Found”. [*]The Disk Utility Tool (by pressing Cmd + R) shows “No Issues Found”. [/LIST] [B]What helps (but these are not solutions):[/B] [LIST] [*]Eject external display. [*]Using Bootcamp (this problem is not observed there at all). [*]Booting in Safe Mode (by pressing Shift after starting a computer). [*]Using my previous MacBook Pro 2015 15” (which also works under the last Catalina version) with the LG display. [/LIST] [U]Please, don’t offer these possible solutions, they aren’t acceptable for me:[/U] [LIST] [*]Return the MacBook to the store. [*]Reinstall macOS from scratch. [/LIST] [I]P.S. AppleCare support doesn't help me :([/I] Please, can anybody help with it? [/QUOTE]
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Apple Computing Products:
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macOS stutters every 2 seconds when an external monitor is plugged in
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