Description of problem:
Happens hundreds of times a day since upgrading to kernel-3.19.3

Additional info:
reporter:       libreport-2.3.0
WARNING: CPU: 1 PID: 62 at drivers/gpu/drm/drm_irq.c:1121 drm_wait_one_vblank+0x164/0x170 [drm]()
vblank not available on crtc 0, ret=-22
Modules linked in: i915 hid_logitech_dj i2c_algo_bit drm_kms_helper firewire_ohci firewire_core crc_itu_t ata_generic drm pata_acpi sky2 video
CPU: 1 PID: 62 Comm: kworker/u4:4 Not tainted 3.19.3-200.fc21.i686 #1
Hardware name: Dell Inc. Inspiron 1525                   /0U990C, BIOS A16 10/16/2008
Workqueue: events_unbound async_run_entry_fn
 c0d039c7 41fb5da7 00000000 f3d37ab8 c0a5d11f f3d37afc f3d37aec c045798b
 f7e2d200 f3d37b1c 0000003e f7e2b4a3 00000461 f7e07bb4 00000461 f7e07bb4
 f6968000 f3eee400 00000000 f3d37b08 c04579fe 00000009 f3d37afc f7e2d200
Call Trace:
 [<c0a5d11f>] dump_stack+0x41/0x52
 [<c045798b>] warn_slowpath_common+0x8b/0xc0
 [<f7e07bb4>] ? drm_wait_one_vblank+0x164/0x170 [drm]
 [<f7e07bb4>] ? drm_wait_one_vblank+0x164/0x170 [drm]
 [<c04579fe>] warn_slowpath_fmt+0x3e/0x60
 [<f7e07bb4>] drm_wait_one_vblank+0x164/0x170 [drm]
 [<f8005af2>] intel_enable_tv+0x22/0x60 [i915]
 [<f7fd2c5d>] i9xx_crtc_enable+0x35d/0x420 [i915]
 [<f7fd1565>] __intel_set_mode+0x8d5/0xab0 [i915]
 [<f7fd6f36>] intel_set_mode+0x76/0xb0 [i915]
 [<f7fd716d>] intel_get_load_detect_pipe+0x1fd/0x4a0 [i915]
 [<f8006656>] intel_tv_detect+0x106/0x5c0 [i915]
 [<c04b0001>] ? timespec_trunc+0x11/0x40
 [<f7d5a7f8>] drm_helper_probe_single_connector_modes_merge_bits+0x2c8/0x410 [drm_kms_helper]
 [<f7d5a957>] drm_helper_probe_single_connector_modes+0x17/0x20 [drm_kms_helper]
 [<f7d637d1>] drm_fb_helper_probe_connector_modes.isra.3+0x41/0x60 [drm_kms_helper]
 [<f7d649f8>] drm_fb_helper_initial_config+0x48/0x380 [drm_kms_helper]
 [<c04020ec>] ? __switch_to+0x11c/0x490
 [<c0a5e907>] ? __schedule+0x247/0x800
 [<f7fe5339>] intel_fbdev_initial_config+0x19/0x20 [i915]
 [<c0473b1e>] async_run_entry_fn+0x4e/0x170
 [<c07ea6ca>] ? deferred_probe_work_func+0xba/0xd0
 [<c046b1c0>] ? pwq_dec_nr_in_flight+0x40/0x90
 [<c046c888>] process_one_work+0x118/0x370
 [<c04b2a1d>] ? try_to_del_timer_sync+0x4d/0x80
 [<c046d189>] worker_thread+0x39/0x420
 [<c046d150>] ? rescuer_thread+0x2a0/0x2a0
 [<c0471526>] kthread+0xa6/0xc0
 [<c0a62701>] ret_from_kernel_thread+0x21/0x30
 [<c0471480>] ? kthread_create_on_node+0x130/0x130

Potential duplicate: bug 1210101