Occasionally my mouse cursor will vanish, accompanied by this warning in dmesg: [ 5622.922652] ------------[ cut here ]------------ [ 5622.922707] WARNING: CPU: 0 PID: 312 at drivers/gpu/drm/i915/intel_uncore.c:455 vlv_flisdsi_write+0x1d69/0x2cc0 [i915]() [ 5622.922710] Device suspended [ 5622.922714] Modules linked in: cpufreq_stats fuse ctr ccm hid_generic hid_sensor_magn_3d hid_sensor_als hid_sensor_gyro_3d hid_sensor_accel_3d hid_sensor_trigger industrialio_triggered_buffer kfifo_buf hid_sensor_iio_common industrialio hid_sensor_hub hid_multitouch usbhid wacom hid btusb joydev bnep bluetooth 6lowpan_iphc tun arc4 nls_cp437 vfat fat iwlmvm mac80211 x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec_hdmi iTCO_wdt kvm_intel iTCO_vendor_support kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper iwlwifi ablk_helper cryptd microcode psmouse cfg80211 serio_raw snd_hda_codec_conexant i2c_i801 lpc_ich snd_hda_codec_generic mfd_core tpm_tis snd_hda_intel thermal tpm wmi thinkpad_acpi snd_hda_codec snd_hwdep nvram battery snd_pcm [ 5622.922796] ac evdev snd_timer snd soundcore intel_smartconnect acpi_cpufreq processor vmnet(O) vmblock(O) vmci(O) vmmon(O) msr ax88179_178a(O) usbnet mii efivarfs ext4 crc16 jbd2 mbcache sd_mod crc_t10dif crct10dif_common crc32c_intel ahci libahci libata xhci_hcd scsi_mod usbcore usb_common i915 video intel_gtt i2c_algo_bit drm_kms_helper drm i2c_core e1000e ptp pps_core ipmi_poweroff ipmi_msghandler button [ 5622.922853] CPU: 0 PID: 312 Comm: X Tainted: G O 3.14.6-1-ec2 #1 [ 5622.922856] Hardware name: LENOVO 20CDCTO1WW/20CDCTO1WW, BIOS GQET35WW (1.15 ) 04/21/2014 [ 5622.922860] 0000000000000009 ffff880212319c08 ffffffff814fd4c3 ffff880212319c50 [ 5622.922867] ffff880212319c40 ffffffff810664ad 0000000000070088 ffff8802119b8000 [ 5622.922873] ffff8802119b8028 ffff8802119b8020 0000000003bb0611 ffff880212319ca0 [ 5622.922880] Call Trace: [ 5622.922891] [<ffffffff814fd4c3>] dump_stack+0x45/0x56 [ 5622.922900] [<ffffffff810664ad>] warn_slowpath_common+0x7d/0xa0 [ 5622.922906] [<ffffffff8106651c>] warn_slowpath_fmt+0x4c/0x50 [ 5622.922922] [<ffffffff811dcaf0>] ? poll_select_copy_remaining+0x130/0x130 [ 5622.922942] [<ffffffffa013a849>] vlv_flisdsi_write+0x1d69/0x2cc0 [i915] [ 5622.922963] [<ffffffffa013af46>] vlv_flisdsi_write+0x2466/0x2cc0 [i915] [ 5622.922986] [<ffffffffa00f364b>] i915_restore_display_reg+0x198b/0x8430 [i915] [ 5622.922995] [<ffffffff81501062>] ? mutex_lock+0x12/0x30 [ 5622.923017] [<ffffffffa00f390f>] i915_restore_display_reg+0x1c4f/0x8430 [i915] [ 5622.923044] [<ffffffffa006d060>] drm_mode_set_config_internal+0x180/0x260 [drm] [ 5622.923053] [<ffffffff81075ed7>] ? __dequeue_signal+0x117/0x200 [ 5622.923083] [<ffffffffa0070d21>] drm_mode_cursor_ioctl+0x41/0x50 [drm] [ 5622.923102] [<ffffffffa0061bb2>] drm_ioctl+0x4c2/0x700 [drm] [ 5622.923131] [<ffffffffa0070ce0>] ? drm_mode_setcrtc+0x5e0/0x5e0 [drm] [ 5622.923140] [<ffffffff811dbf28>] do_vfs_ioctl+0x2c8/0x4a0 [ 5622.923149] [<ffffffff811c90b7>] ? vfs_read+0x97/0x160 [ 5622.923156] [<ffffffff811dc181>] SyS_ioctl+0x81/0xa0 [ 5622.923167] [<ffffffff811002d6>] ? __audit_syscall_exit+0x236/0x2e0 [ 5622.923175] [<ffffffff8150bfad>] system_call_fastpath+0x1a/0x1f [ 5622.923179] ---[ end trace 5e18fb54489137d5 ]--- [ 5622.923185] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register before writing to 70088 [ 5622.923190] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 70088 [ 5622.923194] ------------[ cut here ]------------ [ 5622.923213] WARNING: CPU: 0 PID: 312 at drivers/gpu/drm/i915/intel_uncore.c:455 vlv_flisdsi_write+0x1d69/0x2cc0 [i915]() [ 5622.923215] Device suspended [ 5622.923217] Modules linked in: cpufreq_stats fuse ctr ccm hid_generic hid_sensor_magn_3d hid_sensor_als hid_sensor_gyro_3d hid_sensor_accel_3d hid_sensor_trigger industrialio_triggered_buffer kfifo_buf hid_sensor_iio_common industrialio hid_sensor_hub hid_multitouch usbhid wacom hid btusb joydev bnep bluetooth 6lowpan_iphc tun arc4 nls_cp437 vfat fat iwlmvm mac80211 x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec_hdmi iTCO_wdt kvm_intel iTCO_vendor_support kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper iwlwifi ablk_helper cryptd microcode psmouse cfg80211 serio_raw snd_hda_codec_conexant i2c_i801 lpc_ich snd_hda_codec_generic mfd_core tpm_tis snd_hda_intel thermal tpm wmi thinkpad_acpi snd_hda_codec snd_hwdep nvram battery snd_pcm [ 5622.923290] ac evdev snd_timer snd soundcore intel_smartconnect acpi_cpufreq processor vmnet(O) vmblock(O) vmci(O) vmmon(O) msr ax88179_178a(O) usbnet mii efivarfs ext4 crc16 jbd2 mbcache sd_mod crc_t10dif crct10dif_common crc32c_intel ahci libahci libata xhci_hcd scsi_mod usbcore usb_common i915 video intel_gtt i2c_algo_bit drm_kms_helper drm i2c_core e1000e ptp pps_core ipmi_poweroff ipmi_msghandler button [ 5622.923339] CPU: 0 PID: 312 Comm: X Tainted: G W O 3.14.6-1-ec2 #1 [ 5622.923343] Hardware name: LENOVO 20CDCTO1WW/20CDCTO1WW, BIOS GQET35WW (1.15 ) 04/21/2014 [ 5622.923345] 0000000000000009 ffff880212319c08 ffffffff814fd4c3 ffff880212319c50 [ 5622.923352] ffff880212319c40 ffffffff810664ad 0000000000070084 ffff8802119b8000 [ 5622.923358] ffff8802119b8028 ffff8802119b8020 00000000010a2000 ffff880212319ca0 [ 5622.923364] Call Trace: [ 5622.923370] [<ffffffff814fd4c3>] dump_stack+0x45/0x56 [ 5622.923377] [<ffffffff810664ad>] warn_slowpath_common+0x7d/0xa0 [ 5622.923383] [<ffffffff8106651c>] warn_slowpath_fmt+0x4c/0x50 [ 5622.923406] [<ffffffffa013a849>] vlv_flisdsi_write+0x1d69/0x2cc0 [i915] [ 5622.923426] [<ffffffffa013af46>] vlv_flisdsi_write+0x2466/0x2cc0 [i915] [ 5622.923449] [<ffffffffa00f3751>] i915_restore_display_reg+0x1a91/0x8430 [i915] [ 5622.923471] [<ffffffffa00f390f>] i915_restore_display_reg+0x1c4f/0x8430 [i915] [ 5622.923496] [<ffffffffa006d060>] drm_mode_set_config_internal+0x180/0x260 [drm] [ 5622.923504] [<ffffffff81075ed7>] ? __dequeue_signal+0x117/0x200 [ 5622.923533] [<ffffffffa0070d21>] drm_mode_cursor_ioctl+0x41/0x50 [drm] [ 5622.923552] [<ffffffffa0061bb2>] drm_ioctl+0x4c2/0x700 [drm] [ 5622.923581] [<ffffffffa0070ce0>] ? drm_mode_setcrtc+0x5e0/0x5e0 [drm] [ 5622.923590] [<ffffffff811dbf28>] do_vfs_ioctl+0x2c8/0x4a0 [ 5622.923597] [<ffffffff811c90b7>] ? vfs_read+0x97/0x160 [ 5622.923604] [<ffffffff811dc181>] SyS_ioctl+0x81/0xa0 [ 5622.923612] [<ffffffff811002d6>] ? __audit_syscall_exit+0x236/0x2e0 [ 5622.923619] [<ffffffff8150bfad>] system_call_fastpath+0x1a/0x1f [ 5622.923623] ---[ end trace 5e18fb54489137d6 ]--- [ 5622.923627] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register before writing to 70084 [ 5622.923632] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 70084 [ 5622.936512] ------------[ cut here ]------------ [ 5622.936534] WARNING: CPU: 0 PID: 312 at drivers/gpu/drm/i915/intel_uncore.c:455 vlv_flisdsi_write+0x1d69/0x2cc0 [i915]() [ 5622.936535] Device suspended [ 5622.936536] Modules linked in: cpufreq_stats fuse ctr ccm hid_generic hid_sensor_magn_3d hid_sensor_als hid_sensor_gyro_3d hid_sensor_accel_3d hid_sensor_trigger industrialio_triggered_buffer kfifo_buf hid_sensor_iio_common industrialio hid_sensor_hub hid_multitouch usbhid wacom hid btusb joydev bnep bluetooth 6lowpan_iphc tun arc4 nls_cp437 vfat fat iwlmvm mac80211 x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec_hdmi iTCO_wdt kvm_intel iTCO_vendor_support kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper iwlwifi ablk_helper cryptd microcode psmouse cfg80211 serio_raw snd_hda_codec_conexant i2c_i801 lpc_ich snd_hda_codec_generic mfd_core tpm_tis snd_hda_intel thermal tpm wmi thinkpad_acpi snd_hda_codec snd_hwdep nvram battery snd_pcm [ 5622.936554] ac evdev snd_timer snd soundcore intel_smartconnect acpi_cpufreq processor vmnet(O) vmblock(O) vmci(O) vmmon(O) msr ax88179_178a(O) usbnet mii efivarfs ext4 crc16 jbd2 mbcache sd_mod crc_t10dif crct10dif_common crc32c_intel ahci libahci libata xhci_hcd scsi_mod usbcore usb_common i915 video intel_gtt i2c_algo_bit drm_kms_helper drm i2c_core e1000e ptp pps_core ipmi_poweroff ipmi_msghandler button [ 5622.936567] CPU: 0 PID: 312 Comm: X Tainted: G W O 3.14.6-1-ec2 #1 [ 5622.936568] Hardware name: LENOVO 20CDCTO1WW/20CDCTO1WW, BIOS GQET35WW (1.15 ) 04/21/2014 [ 5622.936569] 0000000000000009 ffff880212319c08 ffffffff814fd4c3 ffff880212319c50 [ 5622.936571] ffff880212319c40 ffffffff810664ad 0000000000070088 ffff8802119b8000 [ 5622.936573] ffff8802119b8028 ffff8802119b8020 0000000003ba0610 ffff880212319ca0 [ 5622.936574] Call Trace: [ 5622.936578] [<ffffffff814fd4c3>] dump_stack+0x45/0x56 [ 5622.936581] [<ffffffff810664ad>] warn_slowpath_common+0x7d/0xa0 [ 5622.936582] [<ffffffff8106651c>] warn_slowpath_fmt+0x4c/0x50 [ 5622.936586] [<ffffffff811dcaf0>] ? poll_select_copy_remaining+0x130/0x130 [ 5622.936591] [<ffffffffa013a849>] vlv_flisdsi_write+0x1d69/0x2cc0 [i915] [ 5622.936595] [<ffffffffa013af46>] vlv_flisdsi_write+0x2466/0x2cc0 [i915] [ 5622.936601] [<ffffffffa00f364b>] i915_restore_display_reg+0x198b/0x8430 [i915] [ 5622.936603] [<ffffffff81501062>] ? mutex_lock+0x12/0x30 [ 5622.936608] [<ffffffffa00f390f>] i915_restore_display_reg+0x1c4f/0x8430 [i915] [ 5622.936615] [<ffffffffa006d060>] drm_mode_set_config_internal+0x180/0x260 [drm] [ 5622.936618] [<ffffffff81075ed7>] ? __dequeue_signal+0x117/0x200 [ 5622.936625] [<ffffffffa0070d21>] drm_mode_cursor_ioctl+0x41/0x50 [drm] [ 5622.936629] [<ffffffffa0061bb2>] drm_ioctl+0x4c2/0x700 [drm] [ 5622.936636] [<ffffffffa0070ce0>] ? drm_mode_setcrtc+0x5e0/0x5e0 [drm] [ 5622.936638] [<ffffffff811dbf28>] do_vfs_ioctl+0x2c8/0x4a0 [ 5622.936640] [<ffffffff811c90b7>] ? vfs_read+0x97/0x160 [ 5622.936642] [<ffffffff811dc181>] SyS_ioctl+0x81/0xa0 [ 5622.936644] [<ffffffff811002d6>] ? __audit_syscall_exit+0x236/0x2e0 [ 5622.936646] [<ffffffff8150bfad>] system_call_fastpath+0x1a/0x1f [ 5622.936647] ---[ end trace 5e18fb54489137d7 ]--- [ 5622.936649] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register before writing to 70088 [ 5622.936651] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 70088 [ 5622.936652] ------------[ cut here ]------------ [ 5622.936656] WARNING: CPU: 0 PID: 312 at drivers/gpu/drm/i915/intel_uncore.c:455 vlv_flisdsi_write+0x1d69/0x2cc0 [i915]() [ 5622.936657] Device suspended [ 5622.936657] Modules linked in: cpufreq_stats fuse ctr ccm hid_generic hid_sensor_magn_3d hid_sensor_als hid_sensor_gyro_3d hid_sensor_accel_3d hid_sensor_trigger industrialio_triggered_buffer kfifo_buf hid_sensor_iio_common industrialio hid_sensor_hub hid_multitouch usbhid wacom hid btusb joydev bnep bluetooth 6lowpan_iphc tun arc4 nls_cp437 vfat fat iwlmvm mac80211 x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec_hdmi iTCO_wdt kvm_intel iTCO_vendor_support kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper iwlwifi ablk_helper cryptd microcode psmouse cfg80211 serio_raw snd_hda_codec_conexant i2c_i801 lpc_ich snd_hda_codec_generic mfd_core tpm_tis snd_hda_intel thermal tpm wmi thinkpad_acpi snd_hda_codec snd_hwdep nvram battery snd_pcm [ 5622.936674] ac evdev snd_timer snd soundcore intel_smartconnect acpi_cpufreq processor vmnet(O) vmblock(O) vmci(O) vmmon(O) msr ax88179_178a(O) usbnet mii efivarfs ext4 crc16 jbd2 mbcache sd_mod crc_t10dif crct10dif_common crc32c_intel ahci libahci libata xhci_hcd scsi_mod usbcore usb_common i915 video intel_gtt i2c_algo_bit drm_kms_helper drm i2c_core e1000e ptp pps_core ipmi_poweroff ipmi_msghandler button [ 5622.936686] CPU: 0 PID: 312 Comm: X Tainted: G W O 3.14.6-1-ec2 #1 [ 5622.936687] Hardware name: LENOVO 20CDCTO1WW/20CDCTO1WW, BIOS GQET35WW (1.15 ) 04/21/2014 [ 5622.936687] 0000000000000009 ffff880212319c08 ffffffff814fd4c3 ffff880212319c50 [ 5622.936689] ffff880212319c40 ffffffff810664ad 0000000000070084 ffff8802119b8000 [ 5622.936690] ffff8802119b8028 ffff8802119b8020 00000000010a2000 ffff880212319ca0 [ 5622.936692] Call Trace: [ 5622.936693] [<ffffffff814fd4c3>] dump_stack+0x45/0x56 [ 5622.936694] [<ffffffff810664ad>] warn_slowpath_common+0x7d/0xa0 [ 5622.936695] [<ffffffff8106651c>] warn_slowpath_fmt+0x4c/0x50 [ 5622.936701] [<ffffffffa013a849>] vlv_flisdsi_write+0x1d69/0x2cc0 [i915] [ 5622.936705] [<ffffffffa013af46>] vlv_flisdsi_write+0x2466/0x2cc0 [i915] [ 5622.936710] [<ffffffffa00f3751>] i915_restore_display_reg+0x1a91/0x8430 [i915] [ 5622.936714] [<ffffffffa00f390f>] i915_restore_display_reg+0x1c4f/0x8430 [i915] [ 5622.936720] [<ffffffffa006d060>] drm_mode_set_config_internal+0x180/0x260 [drm] [ 5622.936722] [<ffffffff81075ed7>] ? __dequeue_signal+0x117/0x200 [ 5622.936728] [<ffffffffa0070d21>] drm_mode_cursor_ioctl+0x41/0x50 [drm] [ 5622.936733] [<ffffffffa0061bb2>] drm_ioctl+0x4c2/0x700 [drm] [ 5622.936738] [<ffffffffa0070ce0>] ? drm_mode_setcrtc+0x5e0/0x5e0 [drm] [ 5622.936740] [<ffffffff811dbf28>] do_vfs_ioctl+0x2c8/0x4a0 [ 5622.936742] [<ffffffff811c90b7>] ? vfs_read+0x97/0x160 [ 5622.936744] [<ffffffff811dc181>] SyS_ioctl+0x81/0xa0 [ 5622.936745] [<ffffffff811002d6>] ? __audit_syscall_exit+0x236/0x2e0 [ 5622.936747] [<ffffffff8150bfad>] system_call_fastpath+0x1a/0x1f [ 5622.936748] ---[ end trace 5e18fb54489137d8 ]--- [ 5622.936749] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register before writing to 70084 [ 5622.936750] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 70084 [ 5835.487021] ------------[ cut here ]------------ [ 5835.487045] WARNING: CPU: 2 PID: 312 at drivers/gpu/drm/i915/intel_uncore.c:455 vlv_flisdsi_write+0x1d69/0x2cc0 [i915]() [ 5835.487045] Device suspended [ 5835.487046] Modules linked in: cpufreq_stats fuse ctr ccm hid_generic hid_sensor_magn_3d hid_sensor_als hid_sensor_gyro_3d hid_sensor_accel_3d hid_sensor_trigger industrialio_triggered_buffer kfifo_buf hid_sensor_iio_common industrialio hid_sensor_hub hid_multitouch usbhid wacom hid btusb joydev bnep bluetooth 6lowpan_iphc tun arc4 nls_cp437 vfat fat iwlmvm mac80211 x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec_hdmi iTCO_wdt kvm_intel iTCO_vendor_support kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper iwlwifi ablk_helper cryptd microcode psmouse cfg80211 serio_raw snd_hda_codec_conexant i2c_i801 lpc_ich snd_hda_codec_generic mfd_core tpm_tis snd_hda_intel thermal tpm wmi thinkpad_acpi snd_hda_codec snd_hwdep nvram battery snd_pcm [ 5835.487066] ac evdev snd_timer snd soundcore intel_smartconnect acpi_cpufreq processor vmnet(O) vmblock(O) vmci(O) vmmon(O) msr ax88179_178a(O) usbnet mii efivarfs ext4 crc16 jbd2 mbcache sd_mod crc_t10dif crct10dif_common crc32c_intel ahci libahci libata xhci_hcd scsi_mod usbcore usb_common i915 video intel_gtt i2c_algo_bit drm_kms_helper drm i2c_core e1000e ptp pps_core ipmi_poweroff ipmi_msghandler button [ 5835.487081] CPU: 2 PID: 312 Comm: X Tainted: G W O 3.14.6-1-ec2 #1 [ 5835.487082] Hardware name: LENOVO 20CDCTO1WW/20CDCTO1WW, BIOS GQET35WW (1.15 ) 04/21/2014 [ 5835.487083] 0000000000000009 ffff880212319bd0 ffffffff814fd4c3 ffff880212319c18 [ 5835.487085] ffff880212319c08 ffffffff810664ad 0000000000070088 ffff8802119b8000 [ 5835.487087] ffff8802119b8028 ffff8802119b8020 00000000025202e8 ffff880212319c68 [ 5835.487089] Call Trace: [ 5835.487093] [<ffffffff814fd4c3>] dump_stack+0x45/0x56 [ 5835.487096] [<ffffffff810664ad>] warn_slowpath_common+0x7d/0xa0 [ 5835.487097] [<ffffffff8106651c>] warn_slowpath_fmt+0x4c/0x50 [ 5835.487101] [<ffffffff813f892a>] ? sock_def_readable+0x3a/0x70 [ 5835.487106] [<ffffffffa013a849>] vlv_flisdsi_write+0x1d69/0x2cc0 [i915] [ 5835.487111] [<ffffffffa013af46>] vlv_flisdsi_write+0x2466/0x2cc0 [i915] [ 5835.487117] [<ffffffffa00f364b>] i915_restore_display_reg+0x198b/0x8430 [i915] [ 5835.487122] [<ffffffffa00f675a>] i915_restore_display_reg+0x4a9a/0x8430 [i915] [ 5835.487130] [<ffffffffa006d0e4>] drm_mode_set_config_internal+0x204/0x260 [drm] [ 5835.487138] [<ffffffffa0070d21>] drm_mode_cursor_ioctl+0x41/0x50 [drm] [ 5835.487143] [<ffffffffa0061bb2>] drm_ioctl+0x4c2/0x700 [drm] [ 5835.487150] [<ffffffffa0070ce0>] ? drm_mode_setcrtc+0x5e0/0x5e0 [drm] [ 5835.487153] [<ffffffff811ca0b5>] ? do_readv_writev+0x195/0x220 [ 5835.487155] [<ffffffff811dbf28>] do_vfs_ioctl+0x2c8/0x4a0 [ 5835.487157] [<ffffffff811dc181>] SyS_ioctl+0x81/0xa0 [ 5835.487160] [<ffffffff811002d6>] ? __audit_syscall_exit+0x236/0x2e0 [ 5835.487162] [<ffffffff8150bfad>] system_call_fastpath+0x1a/0x1f [ 5835.487163] ---[ end trace 5e18fb54489137d9 ]--- [ 5835.487165] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register before writing to 70088 [ 5835.487167] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 70088 [ 5835.487168] ------------[ cut here ]------------ [ 5835.487172] WARNING: CPU: 2 PID: 312 at drivers/gpu/drm/i915/intel_uncore.c:455 vlv_flisdsi_write+0x1d69/0x2cc0 [i915]() [ 5835.487173] Device suspended [ 5835.487174] Modules linked in: cpufreq_stats fuse ctr ccm hid_generic hid_sensor_magn_3d hid_sensor_als hid_sensor_gyro_3d hid_sensor_accel_3d hid_sensor_trigger industrialio_triggered_buffer kfifo_buf hid_sensor_iio_common industrialio hid_sensor_hub hid_multitouch usbhid wacom hid btusb joydev bnep bluetooth 6lowpan_iphc tun arc4 nls_cp437 vfat fat iwlmvm mac80211 x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec_hdmi iTCO_wdt kvm_intel iTCO_vendor_support kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper iwlwifi ablk_helper cryptd microcode psmouse cfg80211 serio_raw snd_hda_codec_conexant i2c_i801 lpc_ich snd_hda_codec_generic mfd_core tpm_tis snd_hda_intel thermal tpm wmi thinkpad_acpi snd_hda_codec snd_hwdep nvram battery snd_pcm [ 5835.487193] ac evdev snd_timer snd soundcore intel_smartconnect acpi_cpufreq processor vmnet(O) vmblock(O) vmci(O) vmmon(O) msr ax88179_178a(O) usbnet mii efivarfs ext4 crc16 jbd2 mbcache sd_mod crc_t10dif crct10dif_common crc32c_intel ahci libahci libata xhci_hcd scsi_mod usbcore usb_common i915 video intel_gtt i2c_algo_bit drm_kms_helper drm i2c_core e1000e ptp pps_core ipmi_poweroff ipmi_msghandler button [ 5835.487206] CPU: 2 PID: 312 Comm: X Tainted: G W O 3.14.6-1-ec2 #1 [ 5835.487206] Hardware name: LENOVO 20CDCTO1WW/20CDCTO1WW, BIOS GQET35WW (1.15 ) 04/21/2014 [ 5835.487207] 0000000000000009 ffff880212319bd0 ffffffff814fd4c3 ffff880212319c18 [ 5835.487209] ffff880212319c08 ffffffff810664ad 0000000000070080 ffff8802119b8000 [ 5835.487210] ffff8802119b8028 ffff8802119b8020 00000000ffffbfff ffff880212319c68 [ 5835.487212] Call Trace: [ 5835.487213] [<ffffffff814fd4c3>] dump_stack+0x45/0x56 [ 5835.487215] [<ffffffff810664ad>] warn_slowpath_common+0x7d/0xa0 [ 5835.487216] [<ffffffff8106651c>] warn_slowpath_fmt+0x4c/0x50 [ 5835.487222] [<ffffffffa013a849>] vlv_flisdsi_write+0x1d69/0x2cc0 [i915] [ 5835.487226] [<ffffffffa013af46>] vlv_flisdsi_write+0x2466/0x2cc0 [i915] [ 5835.487232] [<ffffffffa00f36fe>] i915_restore_display_reg+0x1a3e/0x8430 [i915] [ 5835.487236] [<ffffffffa00f675a>] i915_restore_display_reg+0x4a9a/0x8430 [i915] [ 5835.487243] [<ffffffffa006d0e4>] drm_mode_set_config_internal+0x204/0x260 [drm] [ 5835.487250] [<ffffffffa0070d21>] drm_mode_cursor_ioctl+0x41/0x50 [drm] [ 5835.487255] [<ffffffffa0061bb2>] drm_ioctl+0x4c2/0x700 [drm] [ 5835.487261] [<ffffffffa0070ce0>] ? drm_mode_setcrtc+0x5e0/0x5e0 [drm] [ 5835.487263] [<ffffffff811ca0b5>] ? do_readv_writev+0x195/0x220 [ 5835.487265] [<ffffffff811dbf28>] do_vfs_ioctl+0x2c8/0x4a0 [ 5835.487267] [<ffffffff811dc181>] SyS_ioctl+0x81/0xa0 [ 5835.487269] [<ffffffff811002d6>] ? __audit_syscall_exit+0x236/0x2e0 [ 5835.487271] [<ffffffff8150bfad>] system_call_fastpath+0x1a/0x1f [ 5835.487272] ---[ end trace 5e18fb54489137da ]--- [ 5835.487273] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register before writing to 70080 [ 5835.487274] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 70080 [ 5835.487275] ------------[ cut here ]------------ [ 5835.487288] WARNING: CPU: 2 PID: 312 at drivers/gpu/drm/i915/intel_uncore.c:455 vlv_flisdsi_write+0x1d69/0x2cc0 [i915]() [ 5835.487289] Device suspended [ 5835.487289] Modules linked in: cpufreq_stats fuse ctr ccm hid_generic hid_sensor_magn_3d hid_sensor_als hid_sensor_gyro_3d hid_sensor_accel_3d hid_sensor_trigger industrialio_triggered_buffer kfifo_buf hid_sensor_iio_common industrialio hid_sensor_hub hid_multitouch usbhid wacom hid btusb joydev bnep bluetooth 6lowpan_iphc tun arc4 nls_cp437 vfat fat iwlmvm mac80211 x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec_hdmi iTCO_wdt kvm_intel iTCO_vendor_support kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper iwlwifi ablk_helper cryptd microcode psmouse cfg80211 serio_raw snd_hda_codec_conexant i2c_i801 lpc_ich snd_hda_codec_generic mfd_core tpm_tis snd_hda_intel thermal tpm wmi thinkpad_acpi snd_hda_codec snd_hwdep nvram battery snd_pcm [ 5835.487307] ac evdev snd_timer snd soundcore intel_smartconnect acpi_cpufreq processor vmnet(O) vmblock(O) vmci(O) vmmon(O) msr ax88179_178a(O) usbnet mii efivarfs ext4 crc16 jbd2 mbcache sd_mod crc_t10dif crct10dif_common crc32c_intel ahci libahci libata xhci_hcd scsi_mod usbcore usb_common i915 video intel_gtt i2c_algo_bit drm_kms_helper drm i2c_core e1000e ptp pps_core ipmi_poweroff ipmi_msghandler button [ 5835.487318] CPU: 2 PID: 312 Comm: X Tainted: G W O 3.14.6-1-ec2 #1 [ 5835.487319] Hardware name: LENOVO 20CDCTO1WW/20CDCTO1WW, BIOS GQET35WW (1.15 ) 04/21/2014 [ 5835.487319] 0000000000000009 ffff880212319bd0 ffffffff814fd4c3 ffff880212319c18 [ 5835.487321] ffff880212319c08 ffffffff810664ad 0000000000070084 ffff8802119b8000 [ 5835.487322] ffff8802119b8028 ffff8802119b8020 00000000010a2000 ffff880212319c68 [ 5835.487323] Call Trace: [ 5835.487325] [<ffffffff814fd4c3>] dump_stack+0x45/0x56 [ 5835.487326] [<ffffffff810664ad>] warn_slowpath_common+0x7d/0xa0 [ 5835.487327] [<ffffffff8106651c>] warn_slowpath_fmt+0x4c/0x50 [ 5835.487332] [<ffffffffa013a849>] vlv_flisdsi_write+0x1d69/0x2cc0 [i915] [ 5835.487336] [<ffffffffa013af46>] vlv_flisdsi_write+0x2466/0x2cc0 [i915] [ 5835.487341] [<ffffffffa00f3751>] i915_restore_display_reg+0x1a91/0x8430 [i915] [ 5835.487345] [<ffffffffa00f675a>] i915_restore_display_reg+0x4a9a/0x8430 [i915] [ 5835.487351] [<ffffffffa006d0e4>] drm_mode_set_config_internal+0x204/0x260 [drm] [ 5835.487357] [<ffffffffa0070d21>] drm_mode_cursor_ioctl+0x41/0x50 [drm] [ 5835.487361] [<ffffffffa0061bb2>] drm_ioctl+0x4c2/0x700 [drm] [ 5835.487367] [<ffffffffa0070ce0>] ? drm_mode_setcrtc+0x5e0/0x5e0 [drm] [ 5835.487369] [<ffffffff811ca0b5>] ? do_readv_writev+0x195/0x220 [ 5835.487371] [<ffffffff811dbf28>] do_vfs_ioctl+0x2c8/0x4a0 [ 5835.487372] [<ffffffff811dc181>] SyS_ioctl+0x81/0xa0 [ 5835.487374] [<ffffffff811002d6>] ? __audit_syscall_exit+0x236/0x2e0 [ 5835.487375] [<ffffffff8150bfad>] system_call_fastpath+0x1a/0x1f [ 5835.487376] ---[ end trace 5e18fb54489137db ]--- [ 5835.487377] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed register before writing to 70084 [ 5835.487379] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 70084 I haven't found a good repro case for this yet, but I'm waiting for it to occur again with drm.debug=14 on the kernel command line per Imre Deak's suggestion on LKML. Will post when I have more data...
Created attachment 100891 [details] repro with drm.debug=14 Reproduced the issue. Attaching some dmesg output with context.
Can you please boot with drm.debug=0xe and grab the dmesg for all the boot noise? Just so we're clear what's in your box. Also, is this a regression?
From what I can decipher from the dmesg this looks like bug 81645, setting that as a dependency.
I haven't been able to reproduce this in a while -- not sure if it's still around.
Let's assume it has vanished until it proves otherwise.
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