Hi,
rc6-next-20150813
[ 1.987833] fbcon: inteldrmfb (fb0) is primary device [ 1.988589] ------------[ cut here ]------------ [ 1.988607] WARNING: CPU: 0 PID: 62 at include/linux/ww_mutex.h:158 drm_atomic_check_only+0x24e/0x4ed [drm]() [ 1.988609] DEBUG_LOCKS_WARN_ON(ctx->done_acquire) [ 1.988631] Modules linked in: arc4 nls_iso8859_1 nls_cp437 iwlmvm vfat coretemp hwmon mac80211 serio_raw acpi_cpufreq(-) fat psmouse atkbd iwlwifi libps2 intel_powerclamp i915(+) crc32c_intel cfg80211 r8169 i2c_algo_bit drm_kms_helper cfbfillrect syscopyarea cfbimgblt mii i2c_i801 sysfillrect lpc_ich mfd_core sysimgblt mxm_wmi fb_sys_fops cfbcopyarea thermal drm ie31200_edac edac_core i8042 video wmi evdev backlight serio processor ext4 crc16 mbcache jbd2 sd_mod ehci_pci ehci_hcd ahci libahci libata xhci_pci scsi_mod xhci_hcd usbcore usb_common [ 1.988633] CPU: 0 PID: 62 Comm: kworker/u16:1 Not tainted 4.2.0-rc6-next-20150813-dbg-00006-gf3ed897-dirty #201 [ 1.988638] Workqueue: events_unbound async_run_entry_fn [ 1.988640] 0000000000000000 ffff88041bb73870 ffffffff813921e2 ffff88041bb738b8 [ 1.988641] ffff88041bb738a8 ffffffff810398ea ffffffffa02d8789 ffff88041cf7b400 [ 1.988642] ffff8800c6eac000 ffff880037f01000 ffff88041ad4f600 ffff88041bb73910 [ 1.988643] Call Trace: [ 1.988646] [<ffffffff813921e2>] dump_stack+0x4b/0x63 [ 1.988648] [<ffffffff810398ea>] warn_slowpath_common+0x99/0xb2 [ 1.988661] [<ffffffffa02d8789>] ? drm_atomic_check_only+0x24e/0x4ed [drm] [ 1.988662] [<ffffffff8103994b>] warn_slowpath_fmt+0x48/0x50 [ 1.988673] [<ffffffffa02d8789>] drm_atomic_check_only+0x24e/0x4ed [drm] [ 1.988683] [<ffffffffa02d8a3f>] drm_atomic_commit+0x17/0x52 [drm] [ 1.988690] [<ffffffffa025e9c5>] drm_atomic_helper_plane_set_property+0x6e/0xa5 [drm_kms_helper] [ 1.988701] [<ffffffffa02c92a6>] drm_mode_plane_set_obj_prop+0x31/0x56 [drm] [ 1.988706] [<ffffffffa0260235>] restore_fbdev_mode+0x66/0xd2 [drm_kms_helper] [ 1.988712] [<ffffffffa0261820>] drm_fb_helper_restore_fbdev_mode_unlocked+0x27/0x5e [drm_kms_helper] [ 1.988716] [<ffffffffa0261896>] drm_fb_helper_set_par+0x3f/0x4b [drm_kms_helper] [ 1.988752] [<ffffffffa043df07>] intel_fbdev_set_par+0x17/0x56 [i915] [ 1.988755] [<ffffffff81206f19>] fbcon_init+0x337/0x443 [ 1.988757] [<ffffffff81256c25>] visual_init+0xcd/0x122 [ 1.988759] [<ffffffff812582ae>] do_bind_con_driver+0x1b6/0x2d5 [ 1.988761] [<ffffffff812586de>] do_take_over_console+0x164/0x18e [ 1.988763] [<ffffffff81204eb1>] do_fbcon_takeover+0x60/0x9c [ 1.988764] [<ffffffff8120876c>] fbcon_event_notify+0x423/0x746 [ 1.988766] [<ffffffff810564e8>] ? __blocking_notifier_call_chain+0x33/0x67 [ 1.988767] [<ffffffff81056253>] notifier_call_chain+0x4a/0x6c [ 1.988768] [<ffffffff81056501>] __blocking_notifier_call_chain+0x4c/0x67 [ 1.988769] [<ffffffff81056530>] blocking_notifier_call_chain+0x14/0x16 [ 1.988771] [<ffffffff812099dc>] fb_notifier_call_chain+0x1b/0x1d [ 1.988772] [<ffffffff8120b3a5>] register_framebuffer+0x295/0x2cd [ 1.988778] [<ffffffffa0261b3c>] drm_fb_helper_initial_config+0x29a/0x75e [drm_kms_helper] [ 1.988809] [<ffffffffa043e84d>] intel_fbdev_initial_config+0x1b/0x1d [i915] [ 1.988810] [<ffffffff810573d0>] async_run_entry_fn+0x37/0xcd [ 1.988812] [<ffffffff8104f600>] process_one_work+0x294/0x54d [ 1.988813] [<ffffffff81050665>] worker_thread+0x273/0x366 [ 1.988815] [<ffffffff810503f2>] ? rescuer_thread+0x2a7/0x2a7 [ 1.988816] [<ffffffff810551f7>] kthread+0xf8/0x100 [ 1.988818] [<ffffffff810550ff>] ? kthread_create_on_node+0x1c7/0x1c7 [ 1.988820] [<ffffffff8139887f>] ret_from_fork+0x3f/0x70 [ 1.988822] [<ffffffff810550ff>] ? kthread_create_on_node+0x1c7/0x1c7 [ 1.988823] ---[ end trace 80dfb9f9e0dae41e ]---
-ss