My vintage MacBook4,1 is obviously also affected by this:

[    0.000000] [drm:drm_atomic_helper_wait_for_flip_done [drm_kms_helper]] *ERROR* [CRTC:41:pipe B] flip_done timed out
[    0.000000] ------------[ cut here ]------------
[    0.000000] vblank wait timed out on crtc 1
[    0.000000] WARNING: CPU: 0 PID: 1158 at drivers/gpu/drm/drm_vblank.c:1084 drm_wait_one_vblank+0x15c/0x170 [drm]
[    0.000000] Modules linked in: ipv6 kvm_intel kvm irqbypass btusb btintel btbcm btrtl bluetooth ecdh_generic b43 mac80211 deflate efi_pstore mcryptd sha256_ssse3 joydev i915 snd_hda_codec_realtek sha256_generic snd_hda_codec_generic gpio_ich snd_hda_intel snd_hda_codec snd_hda_core applesmc input_leds drm_kms_helper hwmon appletouch isight_firmware snd_hwdep input_polldev cfg80211 drm fb_sys_fops sysimgblt sysfillrect rfkill syscopyarea snd_pcm i2c_algo_bit bcma snd_timer i2c_i801 rng_core snd pcspkr i2c_core intel_agp led_class ssb_hcd lpc_ich intel_gtt soundcore efivars apple_bl acpi_cpufreq dm_crypt ecb glue_helper crypto_simd cryptd aes_x86_64 xts algif_skcipher af_alg hid_apple dm_mod xfs udf reiserfs ntfs jfs isofs vfat msdos fat ext4 jbd2 crc16 ext2 mbcache dlm fscrypto configfs btrfs raid6_pq
[    0.000000]  zstd_compress xor libcrc32c raid1 md_mod sr_mod ide_gd_mod hid_appleir hid_generic usbhid hid uas usb_storage ide_generic firewire_sbp2 sg sd_mod ide_cd_mod cdrom pata_acpi ide_pci_generic ata_generic ata_piix ahci libahci ehci_pci ehci_hcd uhci_hcd firewire_ohci firewire_core crc_itu_t piix ssb sky2 libata usbcore usb_common
[    0.000000] CPU: 0 PID: 1158 Comm: X Tainted: G        W         4.17.6-dist #1
[    0.000000] Hardware name: Apple Inc. MacBook4,1/Mac-F22788A9, BIOS     MB41.88Z.00C1.B00.0802091535 02/09/08
[    0.000000] RIP: 0010:drm_wait_one_vblank+0x15c/0x170 [drm]
[    0.000000] RSP: 0018:ffffa36d402f7a08 EFLAGS: 00010286
[    0.000000] RAX: 0000000000000000 RBX: ffff95732e4b0000 RCX: 0000000000000006
[    0.000000] RDX: 0000000000000007 RSI: 0000000000000096 RDI: ffff95733fc15390
[    0.000000] RBP: 0000000000000001 R08: 0000000000000030 R09: 0000000000000512
[    0.000000] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[    0.000000] R13: 000000000b000009 R14: ffff95732e661968 R15: ffff9573297fa800
[    0.000000] FS:  00007f84795bbcc0(0000) GS:ffff95733fc00000(0000) knlGS:0000000000000000
[    0.000000] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.000000] CR2: 0000000001684038 CR3: 000000012b90a000 CR4: 00000000000006f0
[    0.000000] Call Trace:
[    0.000000]  ? wait_woken+0x80/0x80
[    0.000000]  intel_get_load_detect_pipe+0x365/0x3b0 [i915]
[    0.000000]  intel_tv_detect+0x126/0x490 [i915]
[    0.000000]  ? merge+0x59/0xb0
[    0.000000]  ? drm_modeset_lock+0x2b/0xa0 [drm]
[    0.000000]  drm_helper_probe_single_connector_modes+0xce/0x6b0 [drm_kms_helper]
[    0.000000]  drm_mode_getconnector+0x2c3/0x2f0 [drm]
[    0.000000]  ? _cond_resched+0x10/0x20
[    0.000000]  ? mutex_lock+0x9/0x30
[    0.000000]  ? drm_mode_connector_property_set_ioctl+0x50/0x50 [drm]
[    0.000000]  drm_ioctl_kernel+0x56/0xb0 [drm]
[    0.000000]  drm_ioctl+0x18d/0x350 [drm]
[    0.000000]  ? drm_mode_connector_property_set_ioctl+0x50/0x50 [drm]
[    0.000000]  ? __fpu__restore_sig+0x70/0x410
[    0.000000]  do_vfs_ioctl+0x9f/0x5f0
[    0.000000]  ? _copy_from_user+0x37/0x60
[    0.000000]  ksys_ioctl+0x35/0x70
[    0.000000]  __x64_sys_ioctl+0x11/0x20
[    0.000000]  do_syscall_64+0x5a/0x170
[    0.000000]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[    0.000000] RIP: 0033:0x7f847713ebb7
[    0.000000] RSP: 002b:00007ffc5f9fb338 EFLAGS: 00003246 ORIG_RAX: 0000000000000010
[    0.000000] RAX: ffffffffffffffda RBX: 0000000001684f80 RCX: 00007f847713ebb7
[    0.000000] RDX: 00007ffc5f9fb370 RSI: 00000000c05064a7 RDI: 000000000000000c
[    0.000000] RBP: 000000000000000c R08: 001e14ebd77f85a3 R09: 00007ffc5facb080
[    0.000000] R10: 000000000000ed2c R11: 0000000000003246 R12: 00000000c05064a7
[    0.000000] R13: 00007ffc5f9fb370 R14: 00007ffc5f9fb370 R15: 0000000001684e30
[    0.000000] Code: 5f f6 0f 0b e9 32 ff ff ff 48 89 e6 4c 89 f7 e8 cb ad 62 f6 45 85 e4 0f 85 14 ff ff ff 89 ee 48 c7 c7 38 cf a7 c0 e8 eb 26 5f f6 <0f> 0b e9 ff fe ff ff e8 28 25 5f f6 0f 1f 84 00 00 00 00 00 8b 
[    0.000000] ---[ end trace 10a5ec3e58e1a8d1 ]---