[ 7516.461543] WARNING: CPU: 1 PID: 4976 at fs/sysfs/group.c:215 sysfs_remove_group+0x5e/0xc0()
[ 7516.461555] sysfs group ffffffff81d11960 not found for kobject 'i2c-6' name 'power'
[ 7516.461566] Modules linked in: tun ccm fuse snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_page_alloc snd_seq_dummy snd_seq_oss arc4 snd_seq_midi iwldvm mac80211 snd_rawmidi i915(-) serio_raw snd_seq_midi_event snd_seq iwlwifi snd_seq_device btusb bnep rfcomm snd_timer bluetooth cfbfillrect thinkpad_acpi cfg80211 cfbimgblt tpm_tis tpm i2c_algo_bit cfbcopyarea snd lpc_ich drm_kms_helper rfkill drm mfd_core intel_smartconnect wmi soundcore vfat fat usbhid [last unloaded: snd_hda_intel]
[ 7516.461739] CPU: 1 PID: 4976 Comm: rmmod Not tainted 3.13.0-rc8+ #38
[ 7516.461763] Hardware name: LENOVO 3460CC6/3460CC6, BIOS G6ET93WW (2.53 ) 02/04/2013
[ 7516.461788]  0000000000000009 ffff8800d36f5b90 ffffffff816fd5bc ffff8800d36f5bd8
[ 7516.461830]  ffff8800d36f5bc8 ffffffff81057bcc ffffffff81d11960 0000000000000000
[ 7516.461860]  ffff8800d494a1b8 ffff8800d494a1a8 ffff8800d494a290 ffff8800d36f5c28
[ 7516.461890] Call Trace:
[ 7516.461908]  [<ffffffff816fd5bc>] dump_stack+0x4e/0x7a
[ 7516.461931]  [<ffffffff81057bcc>] warn_slowpath_common+0x8c/0xc0
[ 7516.461953]  [<ffffffff81057cbc>] warn_slowpath_fmt+0x4c/0x50
[ 7516.461974]  [<ffffffff8170440e>] ? mutex_unlock+0xe/0x10
[ 7516.462003]  [<ffffffff81234b1f>] ? sysfs_get_dirent_ns+0x6f/0x80
[ 7516.462027]  [<ffffffff81235c5e>] sysfs_remove_group+0x5e/0xc0
[ 7516.462049]  [<ffffffff8141382c>] dpm_sysfs_remove+0x3c/0x40
[ 7516.462071]  [<ffffffff81409943>] device_del+0x43/0x1b0
[ 7516.462092]  [<ffffffff81409af8>] device_unregister+0x48/0x60
[ 7516.462114]  [<ffffffff81544b77>] i2c_del_adapter+0x277/0x350
[ 7516.462169]  [<ffffffffa02c0502>] intel_dp_encoder_destroy+0x32/0x90 [i915]
[ 7516.462216]  [<ffffffffa004cd17>] drm_mode_config_cleanup+0x67/0x2a0 [drm]
[ 7516.462270]  [<ffffffffa02b4590>] intel_modeset_cleanup+0xd0/0x110 [i915]
[ 7516.462310]  [<ffffffffa0277675>] i915_driver_unload+0xc5/0x2f0 [i915]
[ 7516.462345]  [<ffffffffa004562c>] drm_dev_unregister+0x2c/0xb0 [drm]
[ 7516.462380]  [<ffffffffa0045a28>] drm_put_dev+0x58/0x70 [drm]
[ 7516.462413]  [<ffffffffa027380d>] i915_pci_remove+0x1d/0x20 [i915]
[ 7516.462432]  [<ffffffff813458a2>] pci_device_remove+0x52/0xd0
[ 7516.462456]  [<ffffffff8140ce4f>] __device_release_driver+0x8f/0xf0
[ 7516.462478]  [<ffffffff8140d90b>] driver_detach+0x9b/0xd0
[ 7516.462501]  [<ffffffff8140cc10>] bus_remove_driver+0xa0/0xc0
[ 7516.462525]  [<ffffffff8140dfd9>] driver_unregister+0x49/0x50
[ 7516.462545]  [<ffffffff813452d2>] pci_unregister_driver+0x22/0xa0
[ 7516.462585]  [<ffffffffa0047d07>] drm_pci_exit+0x47/0xd0 [drm]
[ 7516.462644]  [<ffffffffa02f5afc>] i915_exit+0x20/0x22 [i915]
[ 7516.462668]  [<ffffffff810db024>] SyS_delete_module+0x194/0x250
[ 7516.462719]  [<ffffffff8131b54e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[ 7516.462749]  [<ffffffff8170df52>] system_call_fastpath+0x16/0x1b