Hello everyone,
I have a nMP, 32GB ram, D300, and 10-core CPU, and have had system freezes since I bought the machine refurbished. The best performance that I have had in the past 80 days is 3 days in a row, roughly 5-8 hours per day, with no freezing.
In this message, I will share:
- What goes on when my machine freezes, and
- Propose a set of reproducible conditions which I would appreciate someone else trying. Perhaps if we can find a set of testable conditions that can be reproduced then Apple will take note.
1. What goes on when my machine freezes
The freezing I see is:
- no visible response from the keyboard when letters are typed,
- music is still playing,
- the cursor moves around the screen when I touch the trackpad, a
- there is no response to using Command-Tab to switch apps.
- I also cannot use the mouse to move, resize, or operate buttons or scroll bars in the windows.
- When I press Command-Option-Control-Eject-Delete-Eject, then the music pauses, and I hear a beep sound repeated until I take my fingers off of the keyboard.
When the machine is frozen, and I pull the display port cable out of the Thunderbolt2 port, the monitor goes black, and when I put it back into the same port I took it out of, I see a message on the screen that says "Your computer was restarted because of a problem." The machine reboots and a crash report window comes up, the first three lines of which are:
*** Panic Report ***
panic(cpu 0 caller 0xffffff7f99b8464b): "displayModeDidChange failed: set_display_mode_and_vram failed!
"@/BuildRoot/Library/Caches/com.apple.xbs/Sources/GPUDriversAMD/GPUDriversAMD-1.68.20/Common/GLKernel/ATI/Accel/AMDAccelDisplayMachine.cpp:321
2. A set of reproducible conditions
I have found a set of conditions which other users may be able to replicate, that seem to consistently cause the instability on my nMP within 35 minutes of booting-up:
I open:
- Mail,
- Pages,
- Calendar,
- Safari (and play this video: ),
- If you have it, open Photoshop too (I opened PS CS6).
Note the time, and leave the computer running with the monitor on, and all app windows open. I turned the volume of the music to low using the keyboard. You can use these apps on the machine if you want to (don't open any more apps), or leave the machine alone. These test conditions have brought on the freezing when I use the computer with only these apps open, and when I leave it unused.
Would someone else be kind enough to try these conditions and reply to say what happened to their machine?
Thanks in advance,
Jim