Thomas, v6.12-rc1 plus your off-by-one patch is still broken. Console log from when things went off the rails: [ 32.126676] Console: switching to colour dummy device 80x25 [ 32.134887] mgag200 0000:08:00.0: vgaarb: deactivate vga console [ OK ] Started Show Plymouth Boot Screen. [ OK ] Started Forward Password R…[ 32.155183] mpt2sas_cm0: scatter gather: sge_in_main_msg(1), sge_per_chain(9), sge_per_io(128), chains_per_io(15) s to Plymouth Di[ 32.157213] [drm] Initialized mgag200 1.0.0 for 0000:08:00.0 on minor 0 rectory Watch 32.167994] mpt2sas_cm0: request pool(0x00000000b4be1d72) - dma(0xf880000): depth(3200), frame_size(128), pool_size(400 kB) m. [ OK ] Reached target Path Units. [ OK ] Reached target Basic System. [ 32.190444] fbcon: mgag200drmfb (fb0) is primary device [ 32.224946] mpt2sas_cm0: sense pool(0x000000005610eff3) - dma(0x10100000): depth(2939), element_size(96), pool_size (275 kB) [ 32.225059] mpt2sas_cm0: reply pool(0x000000000f24e619) - dma(0x10180000): depth(3264), frame_size(128), pool_size(408 kB) [ 32.225073] mpt2sas_cm0: config page(0x00000000ba53d4ed) - dma(0xfea3000): size(512) [ 32.225076] mpt2sas_cm0: Allocated physical memory: size(7012 kB) [ 32.225078] mpt2sas_cm0: Current Controller Queue Depth(2936),Max Controller Queue Depth(3072) [ 32.225080] mpt2sas_cm0: Scatter Gather Elements per IO(128) [ 32.242578] ixgbe 0000:03:00.0: Multiqueue Enabled: Rx Queue count = 63, Tx Queue count = 63 XDP Queue count = 0 [ 32.273473] mpt2sas_cm0: LSISAS2308: FWVersion(17.00.01.00), ChipRevision(0x05) [ 32.273486] mpt2sas_cm0: Intel(R) Controller: Subsystem ID: 0x3050 [ 32.273490] mpt2sas_cm0: Protocol=(Initiator), Capabilities=(Raid,TLR,EEDP,Snapshot Buffer,Diag Trace Buffer,Task Set Full,NCQ) [ 32.273693] scsi host6: Fusion MPT SAS Host [ 32.281337] mpt2sas_cm0: sending port enable !! [ 32.327525] ixgbe 0000:03:00.0: 16.000 Gb/s available PCIe bandwidth, limited by 5.0 GT/s PCIe x4 link at 0000:00:03.2 (capable of 32.000 Gb/s with 5.0 GT/s PCIe x8 link) [ 32.349384] ------------[ cut here ]------------ [ 32.349467] [CRTC:34:crtc-0] vblank wait timed out [ 32.349549] WARNING: CPU: 164 PID: 1820 at drivers/gpu/drm/drm_atomic_helper.c:1682 drm_atomic_helper_wait_for_vblanks.part.0+0x24f/0x260 [drm_kms_helper] [ 32.349600] Modules linked in: crct10dif_pclmul crc32_pclmul crc32c_intel mgag200(+) ghash_clmulni_intel i2c_algo_bit sha512_ssse3 drm_shmem_helper drm_kms_helper sha256_ssse3 sha1_ssse3 ixgbe(+) mpt3sas mdio drm raid_class scsi_transport_sas dca wmi fuse [ 32.349676] CPU: 164 UID: 0 PID: 1820 Comm: systemd-udevd Not tainted 6.12.0-rc1+ #170 [ 32.349694] Hardware name: Intel Corporation BRICKLAND/BRICKLAND, BIOS BRBDXSD1.86B.0338.V01.1603162127 03/16/2016 [ 32.349696] RIP: 0010:drm_atomic_helper_wait_for_vblanks.part.0+0x24f/0x260 [drm_kms_helper] [ 32.349706] Code: 00 48 8d 7b 08 e8 61 96 36 e8 45 85 ff 0f 85 d3 fe ff ff 49 8b 56 20 41 8b b6 d8 00 00 00 48 c7 c7 b0 e0 e1 c0 e8 21 3d 2e e8 <0f> 0b e9 b5 fe ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 [ 32.349708] RSP: 0018:ffffa373a4097680 EFLAGS: 00010282 [ 32.349712] RAX: 0000000000000026 RBX: ffff94c556084028 RCX: 0000000000000000 [ 32.349715] RDX: 0000000000000002 RSI: ffffffffaaa3ec38 RDI: 00000000ffffffff [ 32.349717] RBP: ffff94c55a259e00 R08: 0000000000000001 R09: 0000000000000000 [ 32.349719] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000 [ 32.349721] R13: 0000000000000000 R14: ffff94c55b1893f0 R15: 0000000000000000 [ 32.349723] FS: 00007fc95bdc2b40(0000) GS:ffff94d1b2800000(0000) knlGS:0000000000000000 [ 32.349726] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.349728] CR2: 00007f906e3ca948 CR3: 000000000cd1c002 CR4: 00000000003706f0 [ 32.349730] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.349732] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.349734] Call Trace: [ 32.349736] <TASK> [ 32.349739] ? __warn+0x90/0x1a0 [ 32.349754] ? drm_atomic_helper_wait_for_vblanks.part.0+0x24f/0x260 [drm_kms_helper] [ 32.349764] ? report_bug+0x1c3/0x1d0 [ 32.349779] ? handle_bug+0x5b/0xa0 [ 32.349789] ? exc_invalid_op+0x14/0x70 [ 32.349793] ? asm_exc_invalid_op+0x16/0x20 [ 32.349811] ? drm_atomic_helper_wait_for_vblanks.part.0+0x24f/0x260 [drm_kms_helper] [ 32.349822] ? __pfx_autoremove_wake_function+0x10/0x10 [ 32.349833] drm_atomic_helper_commit_tail+0x71/0x80 [drm_kms_helper] [ 32.349843] mgag200_mode_config_helper_atomic_commit_tail+0x28/0x40 [mgag200] [ 32.349851] commit_tail+0x94/0x130 [drm_kms_helper] [ 32.349862] drm_atomic_helper_commit+0x13e/0x170 [drm_kms_helper] [ 32.349872] drm_atomic_commit+0x97/0xb0 [drm] [ 32.349923] ? __pfx___drm_printfn_info+0x10/0x10 [drm] [ 32.349955] drm_client_modeset_commit_atomic+0x207/0x250 [drm] [ 32.349991] drm_client_modeset_commit_locked+0x5b/0x190 [drm] [ 32.350015] drm_client_modeset_commit+0x24/0x50 [drm] [ 32.350038] __drm_fb_helper_restore_fbdev_mode_unlocked+0x95/0xd0 [drm_kms_helper] [ 32.350050] drm_fb_helper_set_par+0x2e/0x40 [drm_kms_helper] [ 32.350059] fbcon_init+0x2a8/0x560 [ 32.350070] visual_init+0xc4/0x120 [ 32.350078] do_bind_con_driver.isra.0+0x1a1/0x3d0 [ 32.350086] do_take_over_console+0x10b/0x1a0 [ 32.350092] do_fbcon_takeover+0x5c/0xc0 [ 32.350095] fbcon_fb_registered+0x49/0x70 [ 32.350098] do_register_framebuffer+0x184/0x230 [ 32.350109] register_framebuffer+0x20/0x40 [ 32.350112] __drm_fb_helper_initial_config_and_unlock+0x33e/0x590 [drm_kms_helper] [ 32.350122] ? drm_client_register+0x33/0xc0 [drm] [ 32.350154] drm_fbdev_shmem_client_hotplug+0x6c/0xc0 [drm_shmem_helper] [ 32.350160] drm_client_register+0x7b/0xc0 [drm] [ 32.350184] mgag200_pci_probe+0x90/0x180 [mgag200] [ 32.350191] local_pci_probe+0x46/0xa0 [ 32.350199] pci_device_probe+0xb5/0x220 [ 32.350206] really_probe+0xd9/0x380 [ 32.350214] __driver_probe_device+0x78/0x150 [ 32.350249] driver_probe_device+0x1e/0x90 [ 32.350254] __driver_attach+0xd6/0x1d0 [ 32.350258] ? __pfx___driver_attach+0x10/0x10 [ 32.350261] bus_for_each_dev+0x66/0xa0 [ 32.350267] bus_add_driver+0x111/0x240 [ 32.350272] driver_register+0x5c/0x120 [ 32.350280] ? __pfx_mgag200_pci_driver_init+0x10/0x10 [mgag200] [ 32.350285] do_one_initcall+0x62/0x3a0 [ 32.350299] ? __kmalloc_cache_noprof+0x240/0x300 [ 32.350315] do_init_module+0x64/0x240 [ 32.350329] init_module_from_file+0x7a/0xa0 [ 32.350341] idempotent_init_module+0x15f/0x260 [ 32.350353] __x64_sys_finit_module+0x5a/0xb0 [ 32.350358] do_syscall_64+0x73/0x190 [ 32.350364] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 32.350368] RIP: 0033:0x7fc95ca07e0d [ 32.350371] Code: c8 0c 00 0f 05 eb a9 66 0f 1f 44 00 00 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 3b 80 0c 00 f7 d8 64 89 01 48 [ 32.350373] RSP: 002b:00007ffef10b2468 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 32.350377] RAX: ffffffffffffffda RBX: 0000562610eb0f80 RCX: 00007fc95ca07e0d [ 32.350379] RDX: 0000000000000000 RSI: 00007fc95cb6132c RDI: 0000000000000010 [ 32.350381] RBP: 0000000000020000 R08: 0000000000000000 R09: 0000000000000000 [ 32.350384] R10: 0000000000000010 R11: 0000000000000246 R12: 00007fc95cb6132c [ 32.350386] R13: 0000562610ed00d0 R14: 0000000000000007 R15: 0000562610ed0380 [ 32.350397] </TASK> [ 32.350399] irq event stamp: 51727 [ 32.350402] hardirqs last enabled at (51733): [<ffffffffa918f854>] vprintk_emit+0x3d4/0x3e0 [ 32.350407] hardirqs last disabled at (51738): [<ffffffffa918f807>] vprintk_emit+0x387/0x3e0 [ 32.350409] softirqs last enabled at (51576): [<ffffffffa90e2891>] __irq_exit_rcu+0xa1/0x110 [ 32.350420] softirqs last disabled at (51569): [<ffffffffa90e2891>] __irq_exit_rcu+0xa1/0x110 [ 32.350423] ---[ end trace 0000000000000000 ]--- [ 32.350452] Console: switching to colour frame buffer device 128x48
