Hi,
I see this on an 32-bit acer atom mini-laptop with -rc8+tip:
[ 2.399416] pipe B vblank wait timed out [ 2.399506] ------------[ cut here ]------------ [ 2.399533] WARNING: CPU: 1 PID: 22 at /mnt/kernel/kernel/linux-2.6/drivers/gpu/drm/i915/intel_display.c:12176 intel_atomic_commit_tail+0xe0d/0xe20 [ 2.399545] Modules linked in: [ 2.399574] CPU: 1 PID: 22 Comm: kworker/1:1 Not tainted 4.14.0-rc8+ #2 [ 2.399583] Hardware name: Acer AOA150/ , BIOS v0.3309 10/06/2008 [ 2.399597] Workqueue: events output_poll_execute [ 2.399613] task: f65a3780 task.stack: f65aa000 [ 2.399625] EIP: intel_atomic_commit_tail+0xe0d/0xe20 [ 2.399634] EFLAGS: 00210286 CPU: 1 [ 2.399643] EAX: 0000001c EBX: 00000000 ECX: 00200046 EDX: c18f6926 [ 2.399652] ESI: 000001a8 EDI: 00000001 EBP: f65abdc0 ESP: f65abd40 [ 2.399662] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [ 2.399671] CR0: 80050033 CR2: 00000000 CR3: 01c81000 CR4: 000006f0 [ 2.399680] Call Trace: [ 2.399699] ? trace_hardirqs_on_caller+0xdc/0x1c0 [ 2.399713] ? wait_woken+0x80/0x80 [ 2.399725] ? wait_woken+0x80/0x80 [ 2.399739] intel_atomic_commit+0x18f/0x250 [ 2.399751] ? intel_atomic_commit+0x18f/0x250 [ 2.399766] drm_atomic_commit+0x3a/0x50 [ 2.399782] restore_fbdev_mode_atomic+0x15b/0x1a0 [ 2.399798] ? intel_atomic_commit_tail+0xe20/0xe20 [ 2.399811] restore_fbdev_mode+0x2c/0x140 [ 2.399824] drm_fb_helper_restore_fbdev_mode_unlocked.part.19+0x23/0x70 [ 2.399836] drm_fb_helper_set_par+0x45/0x80 [ 2.399848] drm_fb_helper_hotplug_event.part.18+0x86/0xb0 [ 2.399861] drm_fb_helper_hotplug_event+0x20/0x30 [ 2.399874] intel_fbdev_output_poll_changed+0x17/0x20 [ 2.399885] drm_kms_helper_hotplug_event+0x21/0x30 [ 2.399897] output_poll_execute+0x8c/0x190 [ 2.399912] process_one_work+0x1c5/0x5c0 [ 2.399927] worker_thread+0x39/0x3c0 [ 2.399939] ? preempt_count_sub+0x98/0xf0 [ 2.399952] ? process_one_work+0x5c0/0x5c0 [ 2.399964] kthread+0x10b/0x140 [ 2.399975] ? process_one_work+0x5c0/0x5c0 [ 2.399987] ? kthread_create_on_node+0x20/0x20 [ 2.399998] ? umh_complete+0x40/0x40 [ 2.400233] ret_from_fork+0x19/0x24 [ 2.400246] Code: 4d 94 8d 55 c4 8b 81 30 02 00 00 01 f0 83 c0 04 e8 f9 a6 c0 ff 85 db 0f 85 e2 fb ff ff 8d 47 41 50 68 08 28 95 c1 e8 90 de c2 ff <0f> ff 58 5a e9 cb fb ff ff 8d 76 00 8d bc 27 00 00 00 00 3e 8d [ 2.400722] ---[ end trace b8984f1a73a52375 ]---