kernel: WARNING: at drivers/gpu/drm/i915/intel_dp.c:1042

Issue

• When external monitor is attached following error messages are observed under /var/log/messages.

kernel: WARNING: at drivers/gpu/drm/i915/intel_dp.c:1042 ironlake_edp_panel_vdd_on+0x3c/0x40 [i915]()
(Tainted: P        W  ---------------   )
kernel: Hardware name: 20BHS0RR01
kernel: eDP VDD already requested on
kernel: Modules linked in: hidp fuse ebtable_nat ebtables ip6_tables rfcomm sco bridge bnep l2cap
autofs4 8021q garp stp llc symap_rh_ES_6_2.6.32_431.el6_x86_64(P)(U) symev_rh_ES_6_2.6.32_431.el6_x86_64(U) cpufreq_ondemand
acpi_cpufreq freq_table mperf nf_conntrack_ftp ipt_MASQUERADE ipt_REDIRECT iptable_nat nf_nat xt_CHECKSUM iptable_mangle
xt_TCPMSS ipt_LOG xt_limit ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables
vhost_net macvtap macvlan tun kvm_intel kvm uinput iTCO_wdt iTCO_vendor_support microcode arc4 iwlmvm mac80211 ipv6
thinkpad_acpi iwlwifi cfg80211 i2c_i801 sg lpc_ich mfd_core uvcvideo videodev v4l2_compat_ioctl32 btusb bluetooth rfkill
shpchp e1000e ptp pps_core snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_intel snd_hda_codec snd_hwdep snd_seq
snd_seq_device snd_pcm snd_timer snd soundcore snd_page_alloc ext4 jbd2 mbcache aesni_intel ablk_helper cryptd
lrw glue_helper aes_x86_64 aes_generic xts gf128mul dm_crypt sd_mod crc_t10dif s
kernel: r_mod cdrom ahci sdhci_pci sdhci mmc_core xhci_hcd i915 nouveau ttm drm_kms_helper drm
i2c_algo_bit i2c_core mxm_wmi video output wmi dm_mirror dm_region_hash dm_log dm_mod [last unloaded: scsi_wait_scan]
kernel: Pid: 157, comm: i915-dp Tainted: P        W  ---------------    2.6.32-504.7.1.el6.x86_64
#1
kernel: Call Trace:
kernel: [<ffffffff81074df7>] ? warn_slowpath_common+0x87/0xc0
kernel: [<ffffffff81074ee6>] ? warn_slowpath_fmt+0x46/0x50
kernel: [<ffffffffa02913ec>] ? ironlake_edp_panel_vdd_on+0x3c/0x40 [i915]
kernel: [<ffffffffa029264d>] ? intel_dp_probe_oui+0x3d/0x100 [i915]
kernel: [<ffffffffa0294ce8>] ? intel_dp_handle_hpd_irq+0x1a8/0x1c0 [i915]
kernel: [<ffffffffa024b8f9>] ? i915_digport_work_func+0x179/0x1a0 [i915]
kernel: [<ffffffffa024b780>] ? i915_digport_work_func+0x0/0x1a0 [i915]
kernel: [<ffffffff81097fe0>] ? worker_thread+0x170/0x2a0
kernel: [<ffffffff8109eb00>] ? autoremove_wake_function+0x0/0x40
kernel: [<ffffffff81097e70>] ? worker_thread+0x0/0x2a0
kernel: [<ffffffff8109e66e>] ? kthread+0x9e/0xc0
kernel: [<ffffffff8100c20a>] ? child_rip+0xa/0x20
kernel: [<ffffffff8109e5d0>] ? kthread+0x0/0xc0
kernel: [<ffffffff8100c200>] ? child_rip+0x0/0x20
kernel: ---[ end trace c0af4a03b8195105 ]---

• If the lid of laptop is closed, the error message occurs every few second. If the lid is opened the error message stops immediately.

• Due to above error messages mouse and keyboard operation is not smooth.