Comment 5 for bug 1501260

may be this help
reproduced on 4.2.1, 4.2.3 kernel but on gentoo :)

[ 5.841753] [drm:check_crtc_state] *ERROR* mismatch in dpll_hw_state.wrpll (expected 0xb0210614, found 0x00000000)
[ 5.842534] ------------[ cut here ]------------
[ 5.843242] WARNING: CPU: 2 PID: 545 at drivers/gpu/drm/i915/intel_display.c:12324 check_crtc_state+0x86d/0xf90()
[ 5.843960] pipe state doesn't match!
[ 5.844670] Modules linked in: bridge stp llc snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_hda_codec_realtek snd_hda_codec_generic intel_rapl snd_hda_codec_hdmi iosf_mbi x86_pkg_temp_thermal input_leds led_class snd_hda_intel snd_hda_codec snd_hwdep snd_hda_core snd_pcm snd_timer crc32c_intel ghash_clmulni_intel aesni_intel aes_x86_64 glue_helper lrw gf128mul ablk_helper cryptd
[ 5.846294] CPU: 2 PID: 545 Comm: X Tainted: G W 4.2.3-gentoo #1
[ 5.847101] Hardware name: ASUS All Series/B85M-E, BIOS 0806 02/20/2014
[ 5.847905] 0000000000000000 ffffffff81a1f318 ffffffff81768b3c ffff880405363918
[ 5.848723] ffffffff8109435c ffff8800d64e3000 ffff88040a302000 ffff8800d7c20000
[ 5.849542] 0000000000000001 ffff88040a302350 ffffffff810943d5 ffffffff819f89d4
[ 5.850351] Call Trace:
[ 5.851152] [<ffffffff81768b3c>] ? dump_stack+0x40/0x50
[ 5.851951] [<ffffffff8109435c>] ? warn_slowpath_common+0x7c/0xb0
[ 5.852740] [<ffffffff810943d5>] ? warn_slowpath_fmt+0x45/0x50
[ 5.853527] [<ffffffff8149bccd>] ? check_crtc_state+0x86d/0xf90
[ 5.853529] [<ffffffff8147915a>] ? i915_get_crtc_scanoutpos+0x18a/0x230
[ 5.853531] [<ffffffff814ae976>] ? intel_modeset_check_state+0x206/0xb00
[ 5.853532] [<ffffffff814affd9>] ? intel_crtc_set_config+0x529/0x590
[ 5.853535] [<ffffffff8141b15e>] ? drm_atomic_helper_plane_set_property+0x7e/0xc0
[ 5.853537] [<ffffffff8142e009>] ? drm_mode_set_config_internal+0x59/0xf0
[ 5.853539] [<ffffffff8141cf32>] ? restore_fbdev_mode+0xb2/0xd0
[ 5.853539] [<ffffffff8141ec0b>] ? drm_fb_helper_restore_fbdev_mode_unlocked+0x1b/0x60
[ 5.853541] [<ffffffff814bea39>] ? intel_fbdev_restore_mode+0x19/0x50
[ 5.853543] [<ffffffff81422888>] ? drm_lastclose+0x28/0x140
[ 5.853544] [<ffffffff81422cac>] ? drm_release+0x30c/0x4f0
[ 5.853546] [<ffffffff8119f7c7>] ? __fput+0xc7/0x1d0
[ 5.853548] [<ffffffff810acf5f>] ? task_work_run+0x7f/0xb0
[ 5.853549] [<ffffffff8104b7fe>] ? do_notify_resume+0x4e/0x70
[ 5.853551] [<ffffffff8176f67c>] ? int_signal+0x12/0x17
[ 5.853552] ---[ end trace d1cdcf9ea2c0170b ]---