Kernel panic after waking up: DCP PANIC - ASSERT!AppleDCPDPTXPowerController.cpp:538

Same issue here with M2 Pro mac 2023, my mac's main display would go blank but rest of the mac works fine (I can hear the OS sounds and see the mac on external monitor) and after several restarts the display comes back live with this same kind of panic error.

Sometimes even after several restarts the mac display doesn't come back and then after hours of leaving the mac to rest, it reboots itself back with a working display. There seems to be no specific trigger point to this problem that I could identify, sometimes it happens when display goes to sleep with open lid, the other times it happens in between I'm working and also sometimes when mac's lid is closed.

Went to apple authorized service centre for this...they first said that this is a software issue and re-installed the macOS and also reinstated the firmware (as they claimed) but even after that, the issue persisted and then this time they said it's an hardware issue with the logic board which needs to be replaced.

But then I contacted apple support over a call and the support person looked at the error logs from console of my mac through screen sharing and concluded that this is caused by some applications demanding for root access/superuser access of my mac repeatedly (in my case adobe softwares as he claimed) and the mac denies it every time thus sending the mac into a forever loop causing the display issue and the kernel panic error.

Will be trying to use the mac after uninstalling the adobe apps.

Keith Collea wrote:

I'm seeing the Genius Bar tomorrow in Beijing, MacBook Air, M2

panic(cpu 1 caller 0xfffffe002f786ea8): DCP PANIC - ASSERT!AppleDCPDPTXPowerController.cpp:538 No device added after powering on the rails. HPD=0 - dcpav(27)

ASSERT!AppleDCPDPTXPowerController.cpp:538 No device added after powering on the rails. HPD=0

Is there any advice in case my Genius has no idea about this? Something I can tell the "Genius"?

DCP = Display Co-Processor

DP = Display Port (?)

TX = Transmit

I interpret this to mean that an external display (or something that has a port/option for a Display) is connected & the Mac provided power to that device, but there has been no acknowledgement of any device communicating. If you have a hub, dock, or an adapter which has or supports a display connection could be the source of the problem in addition to an external display. Or it could be the cable connecting the device to the Mac.

It is definitely something related to a Display. Unfortunately the M-series Macs are so new that many of us are still trying to understand them since there is very little information out there for us to understand the inner workings of the Apple hardware & macOS.

Keep in mind the first line of Apple techs won't understand a Kernel Panic or even know what a Kernel Panic actually is. They will run their service diagnostics which likely will not detect any issues (not unusual), then want to perform a clean install or even a DFU firmware Restore. Apple will only test the laptop in this state without any third party software installed. If they don't see the Kernel Panic after a clean install, they will send you home.

If you have the issue when you get home, then what has changed? Did you install third party software? Restore from a backup? Connect any external devices....even just a cable or adapter?

The more information you can provide to the tech who looks at the laptop, the better. Important details would include how often the Kernel Panics occur. Have you noticed any patterns to when the Kernel Panics occur? Such as waking from sleep, or when powering on the laptop after being completely powered off? Or after using or connect a certain device or combination of devices? Have you noticed the issue when using a particular app or a particular task?

Can you reproduce the Kernel Panic on demand or at least be able to significantly increasing your odds that you can get the laptop to Kernel Panic within a reasonable amount of time while the Apple tech is examining the laptop?

Intermittent issues are always hard to track down unless there is a way to reproduce the issue more often or on demand.

Good luck and let us know how it goes.

Do you have a M2 Mac? Some users on that machine with the error were able to fix it with a Lid Angle Sensor replacement by Apple. If you do not want to take the computer to Apple for diagnostics, then you could prevent the Mac from sleeping in the Lock Screen settings.

If you have not updated to Sequoia, then that would be the first step as some users did find that the panic was resolved with a simple OS update.

Hi guys my problem was solved. My display and lid angle sensor where changed by warranty. This is a hardware issue.

I haven't encountered this issue since I started quitting the Dropbox app before putting my MacBook to sleep. It's been ten days now (before my MacBook would restart twice a day after going to sleep). I thought of sharing this in case it may help someone else.

I had this same problem on my M2 MB Air. I took it to the Genius Bar, but they did not know of a solution. The genius reprogrammed the ROM for the heck of it, and that has fixed the problem. No more kernel panic!

I solved this error message by upgrading to 15.0.1 Sequoia from Sonoma 14.7.

My specifics:

• MacBook Air M2 (2022)
• No peripherals
• Nothing running upon shutdown other than login items & copied.app
• 60% of the time I'd get this error message after shutdown: panic(cpu 0 caller 0xfffffe0029aaeea8): DCP PANIC - ASSERT!AppleDCPDPTXPowerController.cpp:538 No device added after powering on the rails. HPD=0 - dcpav(27)

There are many documented cases of this happening in recent months with m2 machines. Only solution is to prevent the machine from sleeping. Apple has yet to release a fix, nor have I seen acknowledgement of the issue.

Have any of you actually contacted Apple directly to open an official support case for the issue? Apple is not here on these forums so it is possible Apple has not been informed of the issue, plus they may not realize the extent of the issue if only a couple of people have officially reported problems to them. Just because people on the forums may be aware of a potential problem, does not mean that Apple themselves are aware. Plus Apple needs real cases of people having the issue in order to gather important details to help track down the problem.

Many of us did. You know mac os asks you if you want to send kernel crash logs to Apple after the system reboot from a crash right? Apple must have received tons of report pointing to the same issue.

Also, many got their laptops repaired by Apple to fix the issue. Apple must have seen an uptick in this kind of repair.

Backup your mac and update to the latest operating system from a restart where you hold the power button down until you hear the dong twice, but go on YouTube first to see how to upgrade to the latest software from that kind of a restart.

That fixed my problem. I had the exact same issue.

Contact Apple Support.

If this is a wider problem, it’ll get you into the queue.

If this is hardware problem specific to this Mac, it’ll get you a path to a fix.

If there’s any external hardware here, see if removing that temporarily might work around the panic.

I have the same issue for weeks now: “No device added after powering on the rails” error on a 2022 MacBook Air M2. I am out of warranty, and I am unwilling to replace the screen for the obscene amounts of money that Apple is asking. Replacing the screen is the only way to solve the problem, if I read the many comments in the Reddit thread: https://www.reddit.com/r/mac/comments/1cwc1hz/no_device_added_after_powering_on_the_rails_a/