https://bugs.freedesktop.org/show_bug.cgi?id=91960
--- Comment #2 from Denis Ryzhkov denisr@denisr.com --- One more trace:
Oct 2 12:58:27 nb kernel: [ 0.000000] Linux version 3.19.0-30-generic (buildd@lgw01-13) (gcc version 4.9.2 (Ubuntu 4.9.2-10ubuntu13) ) #33-Ubuntu SMP Mon Sep 21 20:58:04 UTC 2015 (Ubuntu 3.19.0-30.33-generic 3.19.8-ckt6) Oct 2 12:58:27 nb kernel: [ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.19.0-30-generic.efi.signed root=... ro quiet splash i915.mmio_debug=1 vt.handoff=7 Oct 2 12:58:27 nb kernel: [ 0.000000] DMI: ASUSTeK COMPUTER INC. TP300LDB/TP300LDB, BIOS TP300LDB.206 12/11/2014
Oct 2 13:02:02 nb kernel: [ 217.737048] ------------[ cut here ]------------ Oct 2 13:02:02 nb kernel: [ 217.737082] WARNING: CPU: 0 PID: 2113 at /build/linux-aY9Y6L/linux-3.19.0/ubuntu/i915/intel_uncore.c:620 hsw_unclaimed_reg_debug+0x7d/0xa0 [i915 _bpo]() Oct 2 13:02:02 nb kernel: [ 217.737084] Unclaimed register detected before writing to register 0x223a0 Oct 2 13:02:02 nb kernel: [ 217.737086] Modules linked in: dm_crypt ctr ccm bbswitch(OE) binfmt_misc rfcomm bnep nls_iso8859_1 uvcvideo videobuf2_vmalloc videobuf2_memops v ideobuf2_core v4l2_common videodev joydev btusb media hid_multitouch bluetooth arc4 asus_nb_wmi asus_wmi mxm_wmi sparse_keymap intel_rapl iosf_mbi snd_soc_rt5640 snd_soc_rl62 31 snd_soc_core snd_hda_codec_hdmi snd_compress x86_pkg_temp_thermal iwlmvm snd_pcm_dmaengine intel_powerclamp coretemp mac80211 kvm_intel kvm crct10dif_pclmul crc32_pclmul g hash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd iwlwifi snd_hda_codec_realtek snd_hda_codec_generic cfg80211 i915_bpo serio_raw intel_ip s lpc_ich shpchp mei_me drm_kms_helper mei snd_hda_intel snd_hda_controller drm snd_hda_codec snd_hwdep i2c_algo_bit snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_s eq wmi snd_seq_device snd_timer dell_smo8800 video snd dw_dmac dw_dmac_core soundcore i2c_hid snd_soc_sst_acpi 8250_dw i2c_designware_platform spi_pxa2xx_platform i2c_designw are_core acpi_pad mac_hid parport_pc ppdev lp parport autofs4 hid_generic usbhid hid psmouse ahci libahci sdhci_acpi sdhci [last unloaded: nvidia] Oct 2 13:02:02 nb kernel: [ 217.737150] CPU: 0 PID: 2113 Comm: chrome Tainted: P OE 3.19.0-30-generic #33-Ubuntu Oct 2 13:02:02 nb kernel: [ 217.737152] Hardware name: ASUSTeK COMPUTER INC. TP300LDB/TP300LDB, BIOS TP300LDB.206 12/11/2014 Oct 2 13:02:02 nb kernel: [ 217.737154] ffffffffc0481150 ffff88022ec03ca8 ffffffff817c4d4f 0000000000000007 Oct 2 13:02:02 nb kernel: [ 217.737156] ffff88022ec03cf8 ffff88022ec03ce8 ffffffff81076a8a ffff8801f388dc00 Oct 2 13:02:02 nb kernel: [ 217.737159] ffff880223070000 00000000000223a0 00000000000223a0 ffff880223070080 Oct 2 13:02:02 nb kernel: [ 217.737162] Call Trace: Oct 2 13:02:02 nb kernel: [ 217.737163] <IRQ> [<ffffffff817c4d4f>] dump_stack+0x45/0x57 Oct 2 13:02:02 nb kernel: [ 217.737175] [<ffffffff81076a8a>] warn_slowpath_common+0x8a/0xc0 Oct 2 13:02:02 nb kernel: [ 217.737177] [<ffffffff81076b06>] warn_slowpath_fmt+0x46/0x50 Oct 2 13:02:02 nb kernel: [ 217.737184] [<ffffffff813829c5>] ? blk_run_queue+0x35/0x40 Oct 2 13:02:02 nb kernel: [ 217.737205] [<ffffffffc03ffc7d>] hsw_unclaimed_reg_debug+0x7d/0xa0 [i915_bpo] Oct 2 13:02:02 nb kernel: [ 217.737223] [<ffffffffc040489a>] gen8_write32+0x5a/0x1b0 [i915_bpo] Oct 2 13:02:02 nb kernel: [ 217.737240] [<ffffffffc03f6e8b>] intel_lrc_irq_handler+0x19b/0x250 [i915_bpo] Oct 2 13:02:02 nb kernel: [ 217.737257] [<ffffffffc03ede64>] gen8_gt_irq_handler+0x274/0x2b0 [i915_bpo] Oct 2 13:02:02 nb kernel: [ 217.737271] [<ffffffffc03edf22>] gen8_irq_handler+0x82/0x5d0 [i915_bpo] Oct 2 13:02:02 nb kernel: [ 217.737276] [<ffffffff815547ef>] ? scsi_finish_command+0xcf/0x130 Oct 2 13:02:02 nb kernel: [ 217.737280] [<ffffffff814d749a>] ? add_interrupt_randomness+0x3a/0x1f0 Oct 2 13:02:02 nb kernel: [ 217.737284] [<ffffffff810cea87>] handle_irq_event_percpu+0x77/0x1a0 Oct 2 13:02:02 nb kernel: [ 217.737287] [<ffffffff810cebf1>] handle_irq_event+0x41/0x70 Oct 2 13:02:02 nb kernel: [ 217.737291] [<ffffffff810d1c5e>] handle_edge_irq+0x6e/0x120 Oct 2 13:02:02 nb kernel: [ 217.737294] [<ffffffff81017772>] handle_irq+0x22/0x40 Oct 2 13:02:02 nb kernel: [ 217.737297] [<ffffffff817cee1f>] do_IRQ+0x4f/0xf0 Oct 2 13:02:02 nb kernel: [ 217.737300] [<ffffffff817ccc2d>] common_interrupt+0x6d/0x6d Oct 2 13:02:02 nb kernel: [ 217.737302] <EOI> Oct 2 13:02:02 nb kernel: [ 217.737304] ---[ end trace 6ed27c185e1a09a4 ]---