Level 1

45 points

Kernel Panic With 4k 240 Hz External Monitor

When connected to my Alienware AW3225QF 4k 240 Hz monitor with my M2 Max MacBook Pro, I encounter a kernel panic and a system crash at least once every 2 days. Is this issue specific to the high resolution and refresh rate combo?

panic(cpu 0 caller 0xfffffe001836b410): DCPEXT2 PANIC - apt firmware: dual\_pipe.c:180 sync\_pipe\_end\_of\_config() -- - iomfb\_mailbox(68) apt firmware: dual\_pipe.c:180 sync\_pipe\_end\_of\_config() -- RTKit: RTKit-2758.1.1.release - Client: AppleDCP-811.1.1\~754-t602xdcp.RELEASE !UUID: a1000010-2140-1ed5-a178-80d201401ed5 ASLR slide: 0x000000000021d000 Time: 0x000000090ceeff39

MacBook Pro 16″, macOS 15.0

Posted on Oct 18, 2024 4:37 AM

Top-ranking reply

Datawa

Level 1

14 points

Posted on Jan 28, 2025 7:53 AM

I have a ROG PG32UCDM with firmware MCM108 and a Mac mini m4 pro. I connected the monitor with a high quality Thunderbolt 4 usb-c cable so I am certain it is not the cable's problem. This issue still exist on macOS 15.3. As long as I set the monitor refresh rate to 240Hz or 48-240Hz, a kernel panic will occur once a while, especially when mac mini was under heavy load such as running video games. this never happened when I set the monitor refresh rate to 120Hz.

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100 replies

Sep 25, 2025 11:00 AM in response to Infilak

same panic-reason, or something new?

Infilak Author

Level 1

45 points

Sep 25, 2025 12:57 PM in response to Grant Bennet-Alder

same reason. It's truly astonishing that they still haven't managed to fix this issue

Infilak Author

Level 1

45 points

Sep 25, 2025 5:19 PM in response to Grant Bennet-Alder

error log

Infilak Author

Level 1

45 points

Sep 25, 2025 6:33 PM in response to Grant Bennet-Alder

yeah, i was really optimistic they would have fixed this issue behind the scenes for the new mac os update. bummer

Infilak Author

Level 1

45 points

Sep 25, 2025 10:40 PM in response to Pavlik1510

Transporting my monitor to the Apple store isn't feasible and the issue could take days to appear

Oct 17, 2025 4:48 PM in response to Infilak

I've been having this 240 Hz crash issue for nearly a year, with two different monitors and two different MacBooks. Following.

Lerinave

Level 1

20 points

Nov 13, 2025 12:48 PM in response to Infilak

Had a fresh episode of the problem on Tahoe 26.1 (public/official), Samsung G9 240 VRR via DP, Mac Studio M2 Max.

Infilak Author

Level 1

45 points

Nov 15, 2025 5:09 PM in response to Lerinave

Were you using a DP80 cable? I haven't had an issue since 26.1 on HDR (fingers crossed).

Infilak Author

Level 1

45 points

Nov 17, 2025 1:07 PM in response to Infilak

RIP, just had another incident...

Lerinave

Level 1

20 points

Dec 14, 2025 12:27 PM in response to Infilak

Okay just had the first episode on MacOS 26.2 public release. Sadly. Just wild when Apple has been claiming its increasing focus to the gaming community.

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Kernel Panic With 4k 240 Hz External Monitor