I’m having trouble with kernels linux510 5.10.175-1 and 4.19.278-1 on my imac late 2015.
They hang at loading modules and won’t continue booting.
Booting back to the previous kernel 5.10.174-1 works fine (thanks Timeshift ! 
) .
I found several errors related to i915 / DRM in dmesg (while trying to boot 4.19.278-1 here), with this line in red:
"kernel: [drm:drm_mode_config_cleanup.cold [drm]] *ERROR* connector DP-3 leaked!"
Followed by several occurances of:
mrt 18 16:01:23 imac kernel: WARN_ON(({ void *__mptr = (void *)(state); do { extern void __compiletime_assert_262(void) __attribute__((error("pointer type mismatch in container_of()"))); if (!(!(!__builtin_types_compatible_p(typeof(*(state)), typeof(((>
mrt 18 16:01:23 imac kernel: WARNING: CPU: 0 PID: 153 at drivers/gpu/drm/i915/intel_atomic_plane.c:105 intel_plane_destroy_state+0x37/0x50 [i915]
mrt 18 16:01:23 imac kernel: Modules linked in: i915(+) kvmgt vfio_mdev sd_mod mdev vfio_iommu_type1 vfio kvm irqbypass intel_gtt i2c_algo_bit ahci drm_kms_helper libahci syscopyarea sdhci_pci libata xhci_pci cqhci sysfillrect sysimgblt fb_sys_fops xhc>
mrt 18 16:01:23 imac kernel: CPU: 0 PID: 153 Comm: (udev-worker) Tainted: G W 4.19.278-1-MANJARO #1
mrt 18 16:01:23 imac kernel: Hardware name: Apple Inc. iMac16,2/Mac-FFE5EF870D7BA81A, BIOS 428.60.3.0.0 10/27/2021
mrt 18 16:01:23 imac kernel: RIP: 0010:intel_plane_destroy_state+0x37/0x50 [i915]
mrt 18 16:01:23 imac kernel: Code: 90 00 00 00 00 48 89 f3 75 0d 48 89 de 48 89 ef 5b 5d e9 ac 6c e3 ff 48 c7 c6 28 38 7b c0 48 c7 c7 11 f1 79 c0 e8 4e d3 57 e3 <0f> 0b 48 89 de 48 89 ef 5b 5d e9 8a 6c e3 ff 66 2e 0f 1f 84 00 00
mrt 18 16:01:23 imac kernel: RSP: 0018:ffffb0d0011bbb38 EFLAGS: 00010282
mrt 18 16:01:23 imac kernel: RAX: 0000000000000000 RBX: ffffa0ad21eba600 RCX: 0000000000000000
mrt 18 16:01:23 imac kernel: RDX: 00000000000001d7 RSI: ffffffffa4ceb497 RDI: 0000000000000246
mrt 18 16:01:23 imac kernel: RBP: ffffa0ad21490400 R08: 0000000000000002 R09: ffffffffa4ceb2bf
mrt 18 16:01:23 imac kernel: R10: 0000000000000001 R11: 0000000000000000 R12: ffffa0ad21b38000
mrt 18 16:01:23 imac kernel: R13: ffffa0ad21b3c9e8 R14: 00000000fffffffa R15: ffffa0ad24e05000
mrt 18 16:01:23 imac kernel: FS: 00007f86e003b080(0000) GS:ffffa0ad26a00000(0000) knlGS:0000000000000000
mrt 18 16:01:23 imac kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
mrt 18 16:01:23 imac kernel: CR2: 00007f8026f80000 CR3: 000000026193a002 CR4: 00000000003606f0
mrt 18 16:01:23 imac kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
mrt 18 16:01:23 imac kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
mrt 18 16:01:23 imac kernel: Call Trace:
mrt 18 16:01:23 imac kernel: drm_plane_cleanup+0xad/0xf0 [drm]
mrt 18 16:01:23 imac kernel: intel_plane_destroy+0xe/0x20 [i915]
mrt 18 16:01:23 imac kernel: drm_mode_config_cleanup+0x104/0x280 [drm]
mrt 18 16:01:23 imac kernel: intel_modeset_cleanup+0xbc/0x130 [i915]
mrt 18 16:01:23 imac kernel: i915_driver_load+0xbad/0xdc0 [i915]
mrt 18 16:01:23 imac kernel: ? acpi_dev_found+0x5f/0x70
mrt 18 16:01:23 imac kernel: local_pci_probe+0x3e/0x80
mrt 18 16:01:23 imac kernel: pci_device_probe+0x102/0x1a0
mrt 18 16:01:23 imac kernel: really_probe+0x245/0x3c0
mrt 18 16:01:23 imac kernel: driver_probe_device+0xb3/0xf0
mrt 18 16:01:23 imac kernel: __driver_attach+0x104/0x110
mrt 18 16:01:23 imac kernel: ? driver_probe_device+0xf0/0xf0
mrt 18 16:01:23 imac kernel: bus_for_each_dev+0x71/0xb0
mrt 18 16:01:23 imac kernel: bus_add_driver+0x16a/0x220
mrt 18 16:01:23 imac kernel: driver_register+0x89/0xd0
mrt 18 16:01:23 imac kernel: ? 0xffffffffc0871000
mrt 18 16:01:23 imac kernel: do_one_initcall+0x46/0x1d0
mrt 18 16:01:23 imac kernel: ? kmem_cache_alloc_trace+0x2f/0x1b0
mrt 18 16:01:23 imac kernel: do_init_module+0x4c/0x260
mrt 18 16:01:23 imac kernel: __se_sys_finit_module+0xb1/0x110
mrt 18 16:01:23 imac kernel: do_syscall_64+0x4e/0x110
mrt 18 16:01:23 imac kernel: entry_SYSCALL_64_after_hwframe+0x5c/0xc1
mrt 18 16:01:23 imac kernel: RIP: 0033:0x7f86e0b660dd
mrt 18 16:01:23 imac kernel: Code: 5d c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 63 7c 0d 00 f7 d8 64 89 01 48
mrt 18 16:01:23 imac kernel: RSP: 002b:00007fff34b17fc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
mrt 18 16:01:23 imac kernel: RAX: ffffffffffffffda RBX: 00005566daeded40 RCX: 00007f86e0b660dd
mrt 18 16:01:23 imac kernel: RDX: 0000000000000000 RSI: 00007f86e0cb9343 RDI: 000000000000001b
mrt 18 16:01:23 imac kernel: RBP: 00007f86e0cb9343 R08: 0000000000000000 R09: 0000000000000000
mrt 18 16:01:23 imac kernel: R10: 000000000000001b R11: 0000000000000246 R12: 0000000000020000
mrt 18 16:01:23 imac kernel: R13: 00005566daece520 R14: 00005566daeded40 R15: 00005566daee28f0
mrt 18 16:01:23 imac kernel: ---[ end trace 07e565c61a1cf4c3 ]---
My system info:
System:
Host: imac Kernel: 5.10.174-1-MANJARO arch: x86_64 bits: 64 compiler: gcc
v: 12.2.1 Desktop: KDE Plasma v: 5.24.7 tk: Qt v: 5.15.8 wm: kwin_x11
dm: SDDM Distro: Manjaro Linux base: Arch Linux
Machine:
Type: Desktop System: Apple product: iMac16,2 v: 1.0
serial: <superuser required> Chassis: type: 13 v: Mac-FFE5EF870D7BA81A
serial: <superuser required>
Mobo: Apple model: Mac-FFE5EF870D7BA81A v: iMac16,2
serial: <superuser required> UEFI: Apple v: 428.60.3.0.0 date: 10/27/2021
CPU:
Info: quad core model: Intel Core i5-5675R bits: 64 type: MCP
arch: Broadwell rev: 1 cache: L1: 256 KiB L2: 1024 KiB L3: 4 MiB
Speed (MHz): avg: 2904 high: 3033 min/max: 800/3600 cores: 1: 2854 2: 2828
3: 3033 4: 2904 bogomips: 24751
Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Graphics:
Device-1: Intel Iris Pro Graphics 6200 vendor: Apple driver: i915 v: kernel
arch: Gen-8 ports: active: DP-3 empty: DP-1, DP-2, HDMI-A-1, HDMI-A-2
bus-ID: 00:02.0 chip-ID: 8086:1622
Device-2: Apple FaceTime HD Camera (Built-in) type: USB driver: uvcvideo
bus-ID: 1-7:3 chip-ID: 05ac:8511
Display: x11 server: X.Org v: 21.1.7 compositor: kwin_x11 driver: X:
loaded: modesetting alternate: fbdev,vesa dri: i965 gpu: i915 display-ID: :0
screens: 1
Screen-1: 0 s-res: 4096x2304 s-dpi: 192
Monitor-1: DP-3 model: Apple iMac res: 4096x2304 dpi: 219
diag: 545mm (21.5")
API: OpenGL v: 4.6 Mesa 21.3.9 Amber renderer: Mesa DRI Intel Iris Pro
Graphics 6200 (BDW GT3) compat-v: 3.0 direct-render: Yes
Audio:
Device-1: Intel Broadwell-U Audio vendor: Apple driver: snd_hda_intel
v: kernel bus-ID: 00:03.0 chip-ID: 8086:160c
Device-2: Intel 9 Series Family HD Audio driver: snd_hda_intel v: kernel
bus-ID: 00:1b.0 chip-ID: 8086:8ca0
Sound API: ALSA v: k5.10.174-1-MANJARO running: yes
Sound Server-1: JACK v: 1.9.22 running: no
Sound Server-2: PulseAudio v: 16.1 running: yes
Sound Server-3: PipeWire v: 0.3.67 running: no
Network:
Device-1: Broadcom BCM43602 802.11ac Wireless LAN SoC vendor: Apple
driver: brcmfmac v: kernel pcie: speed: 2.5 GT/s lanes: 1 bus-ID: 03:00.0
chip-ID: 14e4:43ba
IF: wlp3s0 state: up mac: 28:f0:76:77:58:72
IP v4: 192.168.1.20/24 type: dynamic noprefixroute scope: global
broadcast: 192.168.1.255
Device-2: Broadcom NetXtreme BCM57766 Gigabit Ethernet PCIe driver: tg3
v: kernel pcie: speed: 2.5 GT/s lanes: 1 port: N/A bus-ID: 04:00.0
chip-ID: 14e4:1686
IF: eno1 state: down mac: a8:60:b6:1e:2f:b3
IF-ID-1: tun0 state: unknown speed: 10 Mbps duplex: full mac: N/A
IP v4: 10.120.18.43/23 scope: global
WAN IP: 84.17.46.25
Bluetooth:
Device-1: Apple Bluetooth USB Host Controller type: USB
driver: btusb,hid-generic,usbhid bus-ID: 1-8:5 chip-ID: 05ac:8294
Report: bt-adapter ID: hci0 rfk-id: 0 state: up address: 28:F0:76:77:58:73
Drives:
Local Storage: total: 1.36 TiB used: 496.86 GiB (35.6%)
ID-1: /dev/sda vendor: Apple model: HDD HTS541010A9E662 size: 931.51 GiB
speed: 3.0 Gb/s serial: JD8002D825WUDD
ID-2: /dev/sdb type: USB vendor: Samsung model: Portable SSD T3
size: 465.76 GiB serial: S2WENP0HA05448V
Partition:
ID-1: / size: 457.09 GiB used: 150.72 GiB (33.0%) fs: ext4 dev: /dev/sdb2
ID-2: /boot/efi size: 299.4 MiB used: 16.4 MiB (5.5%) fs: vfat
dev: /dev/sdb1
Swap:
ID-1: swap-1 type: file size: 4 GiB used: 0 KiB (0.0%) priority: -2
file: /swapfile
Sensors:
System Temperatures: cpu: 50.0 C mobo: N/A
Fan Speeds (RPM): N/A
Info:
Processes: 210 Uptime: 57m Memory: 7.64 GiB used: 3.4 GiB (44.5%)
Init: systemd v: 252 default: graphical Compilers: gcc: 12.2.1 clang: 15.0.7
Packages: pm: pacman pkgs: 1360 Shell: Bash v: 5.1.16
running-in: mate-terminal inxi: 3.3.25
Thanks in advance !
Cheers,
Eddy