FYI, we noticed the below changes on git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master commit 8c7b5ccb729870e606321b3703e2c2e698c49a95 ("drm/i915: Use atomic helpers for computing changed flags") +------------------------------------------------------------------+------------+------------+ +------------------------------------------------------------------+------------+------------+ +------------------------------------------------------------------+------------+------------+ [ 22.049656] input: HDA Intel HDMI HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:03.0/sound/card0/input8 [ 22.049705] input: HDA Intel HDMI HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:03.0/sound/card0/input9 [ 22.292948] ------------[ cut here ]------------ [ 22.292963] WARNING: CPU: 0 PID: 46 at drivers/gpu/drm/drm_irq.c:1159 drm_wait_one_vblank+0x180/0x190 [drm]() [ 22.292964] vblank not available on crtc 0, ret=-22 [ 22.292978] Modules linked in: snd_hda_codec_hdmi x86_pkg_temp_thermal coretemp kvm_intel snd_hda_intel snd_hda_controller kvm crct10dif_pclmul ahci crc32_pclmul crc32c_intel ghash_clmulni_intel i915 snd_hda_codec aesni_intel snd_hda_core lrw snd_hwdep libahci gf128mul glue_helper ablk_helper ppdev cryptd drm_kms_helper pcspkr serio_raw microcode snd_pcm i2c_i801 snd_timer libata snd soundcore drm sdhci_acpi winbond_cir rc_core sdhci parport_pc parport video i2c_hid mmc_core dw_dmac dw_dmac_core spi_pxa2xx_platform i2c_designware_platform i2c_designware_core acpi_pad [ 22.292979] CPU: 0 PID: 46 Comm: kworker/0:2 Not tainted 4.1.0-rc2-00294-g8c7b5cc #1 [ 22.292980] Hardware name: Intel Corporation Broadwell Client platform/WhiteTip Mountain 1, BIOS BDW-E1R1.86C.0108.R00.1412212013 12/21/2014 [ 22.292985] Workqueue: events output_poll_execute [drm_kms_helper] [ 22.292987] ffffffffa0174da8 ffff8801493f3948 ffffffff818e42b9 0000000050785078 [ 22.292988] ffff8801493f3998 ffff8801493f3988 ffffffff8107666a 0000000000000000 [ 22.292989] ffff88007e810000 ffff88008cb46800 0000000000000000 0000000000000000 [ 22.292990] Call Trace: [ 22.292994] [<ffffffff818e42b9>] dump_stack+0x4c/0x65 [ 22.292997] [<ffffffff8107666a>] warn_slowpath_common+0x8a/0xc0 [ 22.292999] [<ffffffff810766e6>] warn_slowpath_fmt+0x46/0x50 [ 22.293006] [<ffffffffa0146810>] drm_wait_one_vblank+0x180/0x190 [drm] [ 22.293028] [<ffffffffa03386bf>] ? intel_runtime_pm_get+0x4f/0x80 [i915] [ 22.293053] [<ffffffffa0397e97>] intel_finish_crtc_commit+0x187/0x190 [i915] [ 22.293058] [<ffffffffa0289786>] drm_plane_helper_commit+0x176/0x2c0 [drm_kms_helper] [ 22.293062] [<ffffffffa028996a>] drm_plane_helper_update+0x9a/0xf0 [drm_kms_helper] [ 22.293085] [<ffffffffa03992d0>] __intel_set_mode+0xa40/0xdf0 [i915] [ 22.293109] [<ffffffffa039f922>] intel_crtc_set_config+0x302/0x650 [i915] [ 22.293120] [<ffffffffa014fde6>] drm_mode_set_config_internal+0x66/0x100 [drm] [ 22.293125] [<ffffffffa02925c8>] restore_fbdev_mode+0xc8/0xf0 [drm_kms_helper] [ 22.293130] [<ffffffffa02945e9>] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x80 [drm_kms_helper] [ 22.293134] [<ffffffffa0294662>] drm_fb_helper_set_par+0x22/0x50 [drm_kms_helper] [ 22.293138] [<ffffffffa029456f>] drm_fb_helper_hotplug_event+0x8f/0xe0 [drm_kms_helper] [ 22.293163] [<ffffffffa03aec1e>] intel_fbdev_output_poll_changed+0x1e/0x30 [i915] [ 22.293167] [<ffffffffa028875b>] drm_kms_helper_hotplug_event+0x2b/0x40 [drm_kms_helper] [ 22.293170] [<ffffffffa0288971>] output_poll_execute+0x1a1/0x1c0 [drm_kms_helper] [ 22.293172] [<ffffffff8108fad8>] process_one_work+0x158/0x490 [ 22.293174] [<ffffffff81090733>] worker_thread+0x73/0x580 [ 22.293176] [<ffffffff810906c0>] ? rescuer_thread+0x400/0x400 [ 22.293177] [<ffffffff81095e9f>] kthread+0xef/0x110 [ 22.293178] [<ffffffff81095db0>] ? kthread_create_on_node+0x180/0x180 [ 22.293180] [<ffffffff818ecb62>] ret_from_fork+0x42/0x70 [ 22.293181] [<ffffffff81095db0>] ? kthread_create_on_node+0x180/0x180 [ 22.293182] ---[ end trace edbfc823b56440b6 ]--- [ 22.346595] ata2: SATA link up 6.0 Gbps (SStatus 133 SControl 300) To reproduce: git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml Thanks, Ying Huang