the previous warnings are gone but now i had these 2 warnings when coming back from lunch, so guess it happened during turning the displays back on from sleep state.

Dec 15 12:38:18 linux-k058 kernel: ------------[ cut here ]------------
Dec 15 12:38:18 linux-k058 kernel: WARNING: CPU: 5 PID: 2097 at ../drivers/gpu/drm/i915/intel_display.c:12949 intel_modeset_check_state+0x573/0x8e0 [i915]()
Dec 15 12:38:18 linux-k058 kernel: pipe state doesn't match!
Dec 15 12:38:18 linux-k058 kernel: Modules linked in: cmac rfcomm ecb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc parport fuse vmw_vsock_vmci_transport vsock vmw_vmci af_packet bnep xfs libcrc32c nls_iso8859_1 nls_cp437 vfat fat arc4 snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel x86_pkg_temp_thermal intel_powerclamp snd_hda_codec coretemp snd_hda_core snd_hwdep kvm_intel iwlmvm snd_pcm kvm mac80211 snd_timer irqbypass crct10dif_pclmul iwlwifi crc32_pclmul ghash_clmulni_intel snd aesni_intel btusb hci_uart aes_x86_64 btrtl btqca btbcm lrw gf128mul cfg80211 glue_helper btintel pcspkr ablk_helper soundcore i2c_i801 shpchp cryptd bluetooth rfkill battery wmi pinctrl_sunrisepoint pinctrl_intel intel_lpss_acpi intel_lpss mei_me mfd_core
Dec 15 12:38:18 linux-k058 kernel:  tpm_crb mei acpi_als kfifo_buf acpi_pad tpm_tis industrialio fan thermal tpm btrfs xor raid6_pq hid_generic usbhid crc32c_intel serio_raw e1000e i915 igb dca ptp pps_core i2c_algo_bit drm_kms_helper syscopyarea sysfillrect xhci_pci sysimgblt fb_sys_fops xhci_hcd usbcore drm usb_common video i2c_hid button fjes dm_mirror dm_region_hash dm_log dm_mod sg efivarfs
Dec 15 12:38:18 linux-k058 kernel: CPU: 5 PID: 2097 Comm: X Tainted: G        W       4.4.0-rc4-next-20151211-1.g34634ae-vanilla #1
Dec 15 12:38:18 linux-k058 kernel: Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./Z170N-WIFI-CF, BIOS F4 09/04/2015
Dec 15 12:38:18 linux-k058 kernel:  ffffffffa02fe918 ffff880447ebfb10 ffffffff8138ebc2 ffff880447ebfb58
Dec 15 12:38:18 linux-k058 kernel:  ffff880447ebfb48 ffffffff8107e7d6 ffff88041cae5000 ffff88045e6d9000
Dec 15 12:38:18 linux-k058 kernel:  ffff88045e5d1b48 ffff88007c9fdc00 ffff88045a669400 ffff880447ebfba8
Dec 15 12:38:18 linux-k058 kernel: Call Trace:
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffff8138ebc2>] dump_stack+0x4b/0x79
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffff8107e7d6>] warn_slowpath_common+0x86/0xc0
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffff8107e85c>] warn_slowpath_fmt+0x4c/0x50
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa0290973>] intel_modeset_check_state+0x573/0x8e0 [i915]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa029c513>] intel_atomic_commit+0x883/0xa00 [i915]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa00974a0>] ? drm_atomic_set_crtc_for_connector+0x20/0x90 [drm]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa0098137>] drm_atomic_commit+0x37/0x60 [drm]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa019dce7>] drm_atomic_helper_set_config+0x77/0xb0 [drm_kms_helper]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa00877f4>] drm_mode_set_config_internal+0x64/0x100 [drm]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa008b79d>] drm_mode_setcrtc+0xdd/0x4f0 [drm]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa007d94d>] drm_ioctl+0x25d/0x4f0 [drm]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa008b6c0>] ? drm_mode_setplane+0x1c0/0x1c0 [drm]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffff812197f4>] do_vfs_ioctl+0x304/0x4f0
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffff81223227>] ? __fget+0x77/0xb0
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffff81219a59>] SyS_ioctl+0x79/0x90
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffff816bc276>] entry_SYSCALL_64_fastpath+0x16/0x75
Dec 15 12:38:18 linux-k058 kernel: ---[ end trace c1111c5763966e77 ]---
Dec 15 12:38:18 linux-k058 kernel: ------------[ cut here ]------------
Dec 15 12:38:18 linux-k058 kernel: WARNING: CPU: 5 PID: 2097 at ../drivers/gpu/drm/i915/intel_display.c:13003 check_shared_dpll_state+0x213/0x440 [i915]()
Dec 15 12:38:18 linux-k058 kernel: pll hw state mismatch
Dec 15 12:38:18 linux-k058 kernel: Modules linked in: cmac rfcomm ecb ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc parport fuse vmw_vsock_vmci_transport vsock vmw_vmci af_packet bnep xfs libcrc32c nls_iso8859_1 nls_cp437 vfat fat arc4 snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel x86_pkg_temp_thermal intel_powerclamp snd_hda_codec coretemp snd_hda_core snd_hwdep kvm_intel iwlmvm snd_pcm kvm mac80211 snd_timer irqbypass crct10dif_pclmul iwlwifi crc32_pclmul ghash_clmulni_intel snd aesni_intel btusb hci_uart aes_x86_64 btrtl btqca btbcm lrw gf128mul cfg80211 glue_helper btintel pcspkr ablk_helper soundcore i2c_i801 shpchp cryptd bluetooth rfkill battery wmi pinctrl_sunrisepoint pinctrl_intel intel_lpss_acpi intel_lpss mei_me mfd_core
Dec 15 12:38:18 linux-k058 kernel:  tpm_crb mei acpi_als kfifo_buf acpi_pad tpm_tis industrialio fan thermal tpm btrfs xor raid6_pq hid_generic usbhid crc32c_intel serio_raw e1000e i915 igb dca ptp pps_core i2c_algo_bit drm_kms_helper syscopyarea sysfillrect xhci_pci sysimgblt fb_sys_fops xhci_hcd usbcore drm usb_common video i2c_hid button fjes dm_mirror dm_region_hash dm_log dm_mod sg efivarfs
Dec 15 12:38:18 linux-k058 kernel: CPU: 5 PID: 2097 Comm: X Tainted: G        W       4.4.0-rc4-next-20151211-1.g34634ae-vanilla #1
Dec 15 12:38:18 linux-k058 kernel: Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./Z170N-WIFI-CF, BIOS F4 09/04/2015
Dec 15 12:38:18 linux-k058 kernel:  ffffffffa02fe918 ffff880447ebfa70 ffffffff8138ebc2 ffff880447ebfab8
Dec 15 12:38:18 linux-k058 kernel:  ffff880447ebfaa8 ffffffff8107e7d6 ffff88045cc291e8 0000000000000001
Dec 15 12:38:18 linux-k058 kernel:  0000000000000001 ffff88045cc20000 ffff88045e5d1b78 ffff880447ebfb08
Dec 15 12:38:18 linux-k058 kernel: Call Trace:
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffff8138ebc2>] dump_stack+0x4b/0x79
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffff8107e7d6>] warn_slowpath_common+0x86/0xc0
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffff8107e85c>] warn_slowpath_fmt+0x4c/0x50
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa02b76af>] ? skl_ddi_pll_get_hw_state+0xcf/0xe0 [i915]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa0288be3>] check_shared_dpll_state+0x213/0x440 [i915]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffff8107e7e5>] ? warn_slowpath_common+0x95/0xc0
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa0290766>] intel_modeset_check_state+0x366/0x8e0 [i915]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa029c513>] intel_atomic_commit+0x883/0xa00 [i915]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa00974a0>] ? drm_atomic_set_crtc_for_connector+0x20/0x90 [drm]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa0098137>] drm_atomic_commit+0x37/0x60 [drm]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa019dce7>] drm_atomic_helper_set_config+0x77/0xb0 [drm_kms_helper]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa00877f4>] drm_mode_set_config_internal+0x64/0x100 [drm]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa008b79d>] drm_mode_setcrtc+0xdd/0x4f0 [drm]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa007d94d>] drm_ioctl+0x25d/0x4f0 [drm]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffffa008b6c0>] ? drm_mode_setplane+0x1c0/0x1c0 [drm]
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffff812197f4>] do_vfs_ioctl+0x304/0x4f0
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffff81223227>] ? __fget+0x77/0xb0
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffff81219a59>] SyS_ioctl+0x79/0x90
Dec 15 12:38:18 linux-k058 kernel:  [<ffffffff816bc276>] entry_SYSCALL_64_fastpath+0x16/0x75
Dec 15 12:38:18 linux-k058 kernel: ---[ end trace c1111c5763966e78 ]---
D