hi, a few weeks ago a 21.5'' Late 2013 Mac (with a new 1tb SSD, fully updated to Catalina and quite basic software) started crashing repeatedly, in use and at startup. diagnostics comes up with nothing. Today finally I had a "kernel panic medic" alert.
I paste the .panic text found in library/../diagnosticreports
Can anybody spot a problem?
iMac 21.5″, macOS 10.15
It is graphics related. I do not know what returning 'false' from the vendor driver means, but apparently the macOS software was not happy about it.
panic(cpu 3 caller 0xffffff7f85f843a1): virtual bool IOAccelLegacyDisplayMachine::display_mode_did_change(uint32_t): vendor driver returns false
@/AppleInternal/BuildRoot/Library/Caches/com.apple.xbs/Sources/IOAcceleratorFamily_kexts/IOAcceleratorFamily-438.7.3/Kext2/IOAccelLegacyDisplayMachine.cpp:267
Kernel Extensions in backtrace:
com.apple.iokit.IOGraphicsFamily
dependency: com.apple.iokit.IOPCIFamily
com.apple.iokit.IOAcceleratorFamily2
dependency: com.apple.driver.AppleMobileFileIntegrity
dependency: com.apple.iokit.IOPCIFamily
dependency: com.apple.iokit.IOSurface
dependency: com.apple.iokit.IOGraphicsFamily
dependency: com.apple.iokit.IOReportFamily
com.apple.nvidia.driver.NVDAResman
dependency: com.apple.iokit.IOPCIFamily
dependency: com.apple.iokit.IONDRVSupport
dependency: com.apple.iokit.IOGraphicsFamily
dependency: com.apple.AppleGraphicsDeviceControl
You could try disabling the Discrete GPU and using the intel integrated GPU to see if this is the Discrete graphics chip
gSwitch can keep macOS from using the Discrete GPU
https://codyschrank.github.io/gSwitch
This is an experiment, unless it turns out your Discrete GPU is failing, then you either want to get it fixed (very expensive unless under Apple Care), or run all the time on the integrated intel GPU.
It is graphics related. I do not know what returning 'false' from the vendor driver means, but apparently the macOS software was not happy about it.
panic(cpu 3 caller 0xffffff7f85f843a1): virtual bool IOAccelLegacyDisplayMachine::display_mode_did_change(uint32_t): vendor driver returns false
@/AppleInternal/BuildRoot/Library/Caches/com.apple.xbs/Sources/IOAcceleratorFamily_kexts/IOAcceleratorFamily-438.7.3/Kext2/IOAccelLegacyDisplayMachine.cpp:267
Kernel Extensions in backtrace:
com.apple.iokit.IOGraphicsFamily
dependency: com.apple.iokit.IOPCIFamily
com.apple.iokit.IOAcceleratorFamily2
dependency: com.apple.driver.AppleMobileFileIntegrity
dependency: com.apple.iokit.IOPCIFamily
dependency: com.apple.iokit.IOSurface
dependency: com.apple.iokit.IOGraphicsFamily
dependency: com.apple.iokit.IOReportFamily
com.apple.nvidia.driver.NVDAResman
dependency: com.apple.iokit.IOPCIFamily
dependency: com.apple.iokit.IONDRVSupport
dependency: com.apple.iokit.IOGraphicsFamily
dependency: com.apple.AppleGraphicsDeviceControl
You could try disabling the Discrete GPU and using the intel integrated GPU to see if this is the Discrete graphics chip
gSwitch can keep macOS from using the Discrete GPU
https://codyschrank.github.io/gSwitch
This is an experiment, unless it turns out your Discrete GPU is failing, then you either want to get it fixed (very expensive unless under Apple Care), or run all the time on the integrated intel GPU.
Thank you. The strange thing is that the mac may go on for two-three hours without starting up properly (or maybe it starts up and then freezes with blue dots/flakes/streaks after a couple of minutes). then, at some point, after diagnostic, recovery and some other mumbo-jumbo, it starts and works without a glitch for hours. then I turn it off for the night and the morning after it's kernel panic again. Maybe, it's just aging and it's not a morning guy anymore....
Catalina kernel panic