Description of problem:
Sleep machine.

Additional info:
reporter:       libreport-2.3.0
WARNING: CPU: 0 PID: 8354 at drivers/gpu/drm/drm_irq.c:1121 drm_wait_one_vblank+0x190/0x1a0 [drm]()
vblank not available on crtc 1, ret=-22
Modules linked in: bnep bluetooth ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw binfmt_misc dm_crypt coretemp kvm_intel arc4 brcmsmac cordic brcmutil b43 mac80211 uvcvideo cfg80211 videobuf2_vmalloc videobuf2_core kvm videobuf2_memops v4l2_common videodev ssb media mmc_core snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic crc32c_intel snd_hda_intel snd_hda_controller snd_hda_codec iTCO_wdt iTCO_vendor_support snd_hwdep dell_wmi sparse_keymap snd_seq snd_seq_device
 snd_pcm bcma dell_laptop rfkill dcdbas i8k joydev serio_raw snd_timer mei_me mei lpc_ich mfd_core snd wmi dell_smo8800 intel_ips soundcore tpm_tis tpm i2c_i801 shpchp acpi_cpufreq i915 i2c_algo_bit drm_kms_helper drm r8169 mii video
CPU: 0 PID: 8354 Comm: kworker/u8:3 Not tainted 3.19.3-200.fc21.x86_64 #1
Hardware name: Dell Inc. Vostro 3500/0853K3, BIOS A04   05/21/2010
Workqueue: events_unbound async_run_entry_fn
 0000000000000000 00000000dba1699e ffff88010eea3a68 ffffffff8176e215
 0000000000000000 ffff88010eea3ac0 ffff88010eea3aa8 ffffffff8109bc1a
 ffff880036ad68b0 ffff880036240000 ffff880131ce4800 0000000000000001
Call Trace:
 [<ffffffff8176e215>] dump_stack+0x45/0x57
 [<ffffffff8109bc1a>] warn_slowpath_common+0x8a/0xc0
 [<ffffffff8109bca5>] warn_slowpath_fmt+0x55/0x70
 [<ffffffffa0038930>] drm_wait_one_vblank+0x190/0x1a0 [drm]
 [<ffffffffa0038abd>] ? drm_vblank_off+0x14d/0x1e0 [drm]
 [<ffffffffa0151e77>] intel_disable_hdmi+0x1c7/0x200 [i915]
 [<ffffffffa0123cfa>] ironlake_crtc_disable+0x15a/0x7f0 [i915]
 [<ffffffffa0125619>] intel_crtc_control+0x59/0x120 [i915]
 [<ffffffffa00bca2a>] i915_drm_suspend+0xba/0x1e0 [i915]
 [<ffffffffa00bcb7f>] i915_pm_suspend+0x2f/0x50 [i915]
 [<ffffffff813df31a>] pci_pm_suspend+0x7a/0x170
 [<ffffffff814d58d0>] ? dpm_wait+0x40/0x40
 [<ffffffff813df2a0>] ? pci_pm_freeze+0x100/0x100
 [<ffffffff814d5c1c>] dpm_run_callback+0x4c/0x100
 [<ffffffff814d68fe>] __device_suspend+0x11e/0x350
 [<ffffffff814d6b4f>] async_suspend+0x1f/0xa0
 [<ffffffff810bd06a>] async_run_entry_fn+0x4a/0x150
 [<ffffffff810b487c>] process_one_work+0x14c/0x3f0
 [<ffffffff810b52f3>] worker_thread+0x53/0x470
 [<ffffffff810b52a0>] ? rescuer_thread+0x300/0x300
 [<ffffffff810ba548>] kthread+0xd8/0xf0
 [<ffffffff810ba470>] ? kthread_create_on_node+0x1b0/0x1b0
 [<ffffffff81774958>] ret_from_fork+0x58/0x90
 [<ffffffff810ba470>] ? kthread_create_on_node+0x1b0/0x1b0