Description of problem:
Running a ThinkPad X220.

Added the following to GRUB_CMDLINE_LINUX to help control MCE problems due to overheating.

   threadirqs pcie_aspm=force i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 i915.lvds_downclock=1 iwlagn.power_save=1 iwlagn.power_level=5

Additional info:
reporter:       libreport-2.3.0
WARNING: CPU: 1 PID: 371 at drivers/gpu/drm/i915/intel_display.c:9705 intel_check_page_flip+0xa2/0xf0 [i915]()
WARN_ON(!in_irq())
Modules linked in:
 i915 crct10dif_pclmul crc32_pclmul crc32c_intel i2c_algo_bit e1000e drm_kms_helper ghash_clmulni_intel drm ptp pps_core video
CPU: 1 PID: 371 Comm: irq/33-i915 Not tainted 3.19.1-201.fc21.x86_64 #1
Hardware name: LENOVO 4286CTO/4286CTO, BIOS 8DET69WW (1.39 ) 07/18/2013
 0000000000000000 0000000027ca689c ffff880407a43c88 ffffffff8176d865
 0000000000000000 ffff880407a43ce0 ffff880407a43cc8 ffffffff8109bc0a
 ffff880407a43cc8 ffff88040883d000 ffff880408fda000 0000000000000000
Call Trace:
 [<ffffffff8176d865>] dump_stack+0x45/0x57
 [<ffffffff8109bc0a>] warn_slowpath_common+0x8a/0xc0
 [<ffffffff8109bc95>] warn_slowpath_fmt+0x55/0x70
 [<ffffffffa018b3f2>] intel_check_page_flip+0xa2/0xf0 [i915]
 [<ffffffffa01587d1>] ironlake_irq_handler+0x311/0xff0 [i915]
 [<ffffffff810daba7>] ? put_prev_task_rt+0x17/0x40
 [<ffffffff810f3750>] ? irq_thread_fn+0x50/0x50
 [<ffffffff810f377d>] irq_forced_thread_fn+0x2d/0x70
 [<ffffffff810f3bcf>] irq_thread+0x13f/0x170
 [<ffffffff810f37c0>] ? irq_forced_thread_fn+0x70/0x70
 [<ffffffff810f3a90>] ? irq_thread_check_affinity+0xf0/0xf0
 [<ffffffff810ba458>] kthread+0xd8/0xf0
 [<ffffffff810ba380>] ? kthread_create_on_node+0x1b0/0x1b0
 [<ffffffff81773f7c>] ret_from_fork+0x7c/0xb0
 [<ffffffff810ba380>] ? kthread_create_on_node+0x1b0/0x1b0