Backtrace

WARNING: CPU: 4 PID: 4060 at drivers/gpu/drm/i915/intel_runtime_pm.c:614 skl_enable_dc6+0xc5/0xe0 [i915]
DC6 already programmed to be enabled.
Modules linked in: fuse bsd_comp ppp_synctty ppp_async crc_ccitt ppp_generic slhc vboxnetadp(O) vboxnetflt(O) vboxdrv(O) ip6t_REJECT nf_reject_ipv6 ip6table_filter ip6t_rpfilter ip6table_raw ip6table_security ip6table_mangle ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6_tables ts_bm xt_string xt_recent xt_conntrack iptable_filter xt_nat ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle sunrpc vfat fat snd_hda_codec_hdmi dell_wmi iTCO_wdt dell_smbios snd_hda_codec_realtek sparse_keymap iTCO_vendor_support arc4 snd_hda_codec_generic intel_powerclamp coretemp intel_rapl ath9k kvm_intel dcdbas kvm ath9k_common ath3k ath9k_hw btusb btrtl btbcm btintel joydev ath snd_hda_intel irqbypass mac80211
bluetooth crc32_pclmul snd_hda_codec snd_hda_core snd_hwdep ghash_clmulni_intel snd_seq snd_seq_device snd_pcm cfg80211 aesni_intel snd_timer lrw snd gf128mul mei_me glue_helper ablk_helper cryptd soundcore pcspkr mei i2c_i801 rfkill sg pinctrl_sunrisepoint pinctrl_intel shpchp acpi_pad binfmt_misc ip_tables xfs libcrc32c rtsx_usb_sdmmc mmc_core rtsx_usb sr_mod cdrom sd_mod crc_t10dif crct10dif_generic nouveau i915 serio_raw crct10dif_pclmul crct10dif_common crc32c_intel mxm_wmi ttm r8169 wmi mii iosf_mbi i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ahci video drm libahci i2c_hid libata i2c_core dm_mirror dm_region_hash dm_log dm_mod
CPU: 4 PID: 4060 Comm: X Kdump: loaded Tainted: G           O   ------------   3.10.0-862.14.4.el7.x86_64 #1
Hardware name: Dell Inc. Vostro 3668/0N9Y46, BIOS 1.12.0 04/18/2019
Call Trace:
[<ffffffff84f13754>] dump_stack+0x19/0x1b
[<ffffffff848945d8>] __warn+0xd8/0x100
[<ffffffff8489465f>] warn_slowpath_fmt+0x5f/0x80
[<ffffffffc05715e1>] ? hsw_power_well_enable+0xe1/0x160 [i915]
[<ffffffffc05b3020>] ? gen8_write8+0x170/0x170 [i915]
[<ffffffffc0572c25>] skl_enable_dc6+0xc5/0xe0 [i915]
[<ffffffffc057333d>] gen9_dc_off_power_well_disable+0x3d/0x50 [i915]
[<ffffffffc0570b16>] intel_power_well_disable+0x46/0x50 [i915]
[<ffffffffc0573f17>] intel_display_power_put+0xb7/0x130 [i915]
[<ffffffffc060a6e9>] intel_dp_detect+0x1d9/0x6b0 [i915]
[<ffffffffc04ac220>] drm_helper_probe_detect+0x50/0x90 [drm_kms_helper]
[<ffffffffc04ac352>] drm_helper_probe_single_connector_modes+0xf2/0x780 [drm_kms_helper]
[<ffffffffc0434b06>] drm_mode_getconnector+0x346/0x3a0 [drm]
[<ffffffffc043593e>] ? drm_mode_object_find+0xe/0x10 [drm]
[<ffffffffc043692d>] ? drm_mode_getproperty_ioctl+0x14d/0x1b0 [drm]
[<ffffffffc04347c0>] ? drm_mode_connector_property_set_ioctl+0x60/0x60 [drm]
[<ffffffffc041cedc>] drm_ioctl_kernel+0x6c/0xb0 [drm]
[<ffffffffc041d1b0>] drm_ioctl+0x1f0/0x450 [drm]
[<ffffffffc04347c0>] ? drm_mode_connector_property_set_ioctl+0x60/0x60 [drm]
[<ffffffff848ac1dc>] ? signal_setup_done+0x3c/0x60
[<ffffffff84837c69>] ? __restore_xstate_sig+0x99/0x5f0
[<ffffffff8482b6a0>] ? do_signal+0x1d0/0x6e0
[<ffffffff84a34100>] do_vfs_ioctl+0x360/0x550
[<ffffffff848a8d2b>] ? recalc_sigpending+0x1b/0x70
[<ffffffff84a34391>] SyS_ioctl+0xa1/0xc0
[<ffffffff84f2579b>] system_call_fastpath+0x22/0x27