Ok, a new/old problem, also present in Catalina for me with Clover r4961.
If my monitor is attached to the VGA port when Clover is loading, then every time I get this kernel panic.
If there is no VGA monitor attached until the macOS login screen, then I can attach it at that point without problems.
It does not matter if there is a second HDMI monitor attached or not.
Also the fact, that Clover has already loaded is important. If I disconnect the monitor at the Clover boot menu screen, then it will panic again... I have to reboot once with the monitor detached.
And this is bugging me a lot... I have to detach / reattach my VGA monitor on every laptop power-on.
This was an issue for me since High Sierra, later with Mojave, and now with Catalina.
Any help or idea will be greatly appreciated!
EDIT: I have attached also a picture with the last messages before the freeze, with "verbose" and "do not restart on kernel panic" options in Clover
Code:
panic(cpu 0 caller 0xffffff7f8f353d93): assertmsg@/Library/Caches/com.apple.xbs/Sources/GPUDriversIntel/GPUDriversIntel-14.0.69/IONDRV/HSW/AppleIntelFramebuffer/AppleIntelController.cpp:17323
Backtrace (CPU 0), Frame : Return Address
0xffffff820b483650 : 0xffffff800e13f98b
0xffffff820b4836a0 : 0xffffff800e276c15
0xffffff820b4836e0 : 0xffffff800e26861e
0xffffff820b483730 : 0xffffff800e0e6a40
0xffffff820b483750 : 0xffffff800e13f077
0xffffff820b483850 : 0xffffff800e13f45b
0xffffff820b4838a0 : 0xffffff800e8d2d89
0xffffff820b483910 : 0xffffff7f8f353d93
0xffffff820b483920 : 0xffffff7f8f332dd2
0xffffff820b483930 : 0xffffff7f8f30ee26
0xffffff820b483950 : 0xffffff7f8f30f172
0xffffff820b4839a0 : 0xffffff7f8f1d7dd3
0xffffff820b483a30 : 0xffffff7f8f1d7c30
0xffffff820b483ac0 : 0xffffff800e867adb
0xffffff820b483b10 : 0xffffff7f8f1de1f8
0xffffff820b483b60 : 0xffffff800e870a73
0xffffff820b483ca0 : 0xffffff800e226672
0xffffff820b483db0 : 0xffffff800e1457f8
0xffffff820b483e10 : 0xffffff800e11c515
0xffffff820b483e70 : 0xffffff800e132f75
0xffffff820b483f00 : 0xffffff800e24eaf5
0xffffff820b483fa0 : 0xffffff800e0e7226
Kernel Extensions in backtrace:
com.apple.iokit.IOGraphicsFamily(558.3)[23A17FD4-B8DA-3D9D-8AC5-D05039DF41ED]@0xffffff7f8f1bb000->0xffffff7f8f20bfff
dependency: com.apple.iokit.IOPCIFamily(2.9)[E6E855AD-A5B2-3518-A997-1384B4360708]@0xffffff7f8eea1000
com.apple.driver.AppleIntelFramebufferAzul(14.0)[EDFFAA45-DE11-3D26-9F61-FBDE4F96789C]@0xffffff7f8f2fe000->0xffffff7f8f461fff
dependency: com.apple.iokit.IOPCIFamily(2.9)[E6E855AD-A5B2-3518-A997-1384B4360708]@0xffffff7f8eea1000
dependency: com.apple.iokit.IOACPIFamily(1.4)[9BA2613C-A129-3EDD-8DC1-2CFF6B62B832]@0xffffff7f8ee8f000
dependency: com.apple.iokit.IOAcceleratorFamily2(438.1.23)[95FE222A-D225-3208-87A9-C2691A025BE7]@0xffffff7f8f21a000
dependency: com.apple.iokit.IOReportFamily(47)[0CAFCFA4-9263-3847-8ED0-1867D214CDD7]@0xffffff7f8ea9f000
dependency: com.apple.AppleGraphicsDeviceControl(4.1.46)[0266F94C-3545-376D-AF0F-802F6D340F1C]@0xffffff7f8f2f2000
dependency: com.apple.iokit.IOGraphicsFamily(558.3)[23A17FD4-B8DA-3D9D-8AC5-D05039DF41ED]@0xffffff7f8f1bb000
BSD process name corresponding to current thread: WindowServer
Boot args: dart=0
Mac OS version:
19A602
Kernel version:
Darwin Kernel Version 19.0.0: Wed Sep 25 20:18:50 PDT 2019; root:xnu-6153.11.26~2/RELEASE_X86_64
Kernel UUID: 70EDD61F-86EE-3E1B-873F-98D909B78160
Kernel slide: 0x000000000de00000
Kernel text base: 0xffffff800e000000
__HIB text base: 0xffffff800df00000
System model name: MacBookAir6,2 (Mac-7DF21CB3ED6977E5)
System shutdown begun: NO
Panic diags file available: YES (0x0)
System uptime in nanoseconds: 9146376169
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