Would moving that third card to a B assignable slot improve things? I haven’t tried that yet as you didn’t suggest it and because it would upset the nice resource allocation shown for A/B now, 100% A, 94% B. If the MP remains connected to power while shutdown, things are pretty stable but not perfect. The frequency of the sleep/wake kernel panics has reduced substantially. The third Accelsior remains in slot three. That was a dyslectic initial response to the instructions on my part. You’re right about the the reversal of the A/B slot position. This is a depressing to way to start off with such an ostensibly fine machine. If that provided a fix I assume word would have been out by now. Is there any news of progress on Apples side regarding a fix? I would move to the latest version of Catalina but it doesn’t yet support my principle working app. Once the master power was shut off then turned on the next day, the boot error reappeared. This behavior is inconsistent, creating the impression that some juggling of parameters my have solved the problem, but no.Īt one point, allocating the NVMe cards to the B pool seemed to be a cure but that only worked when shutting down while leaving the MP connected to power. Sometimes, after shutting down, not being put in sleep mode, the MP will reboot itself as if it’s actually been sleeping, not having been shutdown, sort of an involuntary resurrection.
There is often another, similar error that is logged as, ‘PowerOff timed out in phase “Notifying power plane drivers”. OS Catalina 10.15.3ĭespite running the NVMe cards in the B pool I still experience Sleep/Wake kernel panics. Slot 1-x, slot 6 avid HD Native, slot 7 Sonnet USB and slot 8 Apple I/O.
Kernel panic mode note 4 pro#
I’m running a Mac pro 2019 with 3 Accelsior 4M2 cards in slots 3, 4, 5. Slot 8 is always occupied by the Apple Thunderbolt card. You can move your OWC Accelsior 4M2 card to slots 1, 2, 3, 6, or 7, and this will prevent the kernel panic from occurring. Move the OWC Accelsior 4M2 Card to a Slot Other Than Slot 4 or 5 You can either move the card to a different slot or change the slot to use pool A of the PCIe lanes. Since the kernel panic occurs only when the OWC Accelsior 4M2 is in slots 4 or 5, and the slot is using pool B of the PCIe lanes, the solution for your 2019 Mac Pro is easy.
Kernel panic mode note 4 how to#
How to Prevent the Kernel Panic From Occurring We have since reported this problem to Apple and are working with them to develop a solution. Like the problem we discovered recently - where a Mac hangs while transferring large files - I am confident that they will develop a quick and reliable fix for this problem. We then contacted our PCIe chip supplier in Taiwan to get help determining why macOS thought there was an error on the PCIe bus. Their engineers analyzed the signals on the PCIe bus and told us that macOS was mistakenly indicating that there is an error when, in fact, all the signals were correct. The teams also found other cards, which, when installed, result in a kernel panic. More importantly, we figured out that the problem only occurs when the OWC Accelsior 4M2 is installed in slots 4 or 5 and only if those slots are configured to use pool B of the PCIe lanes (see below). If OWC Accelsior 4M2 is in any other slot, or if it is configured to use pool A, no kernel panics occur. We determined that the kernel panic occurs when the 2019 Mac Pro sleeps.
Kernel panic mode note 4 software#
Through many hours of dedicated work, our teams figured out what hardware configurations are required for a kernel panic to occur. We worked literally around the clock investigating this problem: when our software development team in California finish testing for the day, our hardware design team in Taipei, on the other side of the world, would pick up where the California team left off. This kernel panic was most often occurring to customers with 2 or more OWC Accelsior 4M2 cards installed. The log from macOS said that the kernel panic was caused by an error on the PCIe bus, the wires on the circuit board, which connects cards to the Intel processor. These panics only occurred in a very small percentage of customers who had installed our OWC Accelsior 4M2 cards. So when we started to hear that a few customers were experiencing kernel panics on their 2019 Mac Pros, we wanted to quickly figure out what was happening. We Start Hearing From Our CustomersĪ kernel panic is even worse when it is happening on your brand new 2019 Mac Pro, a computer that may have cost $10,000 or more. This is when your Mac restarts itself while you are working. After it finishes the restart process, you see a dialog telling you that your Mac shut down because of a problem. Worse yet, you may have lost all of your recent work as files are not saved during this type of restart. Nobody likes to experience a kernel panic on their Mac.
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