dz0ny, the next step is to fully reverse commit bisect from kernel 4.4 to 4.8-rc3 in order to identify the last bad commit, followed immediately by the first good one. Once this good commit has been identified, it may be reviewed for backporting. Could you please do this following https://wiki.ubuntu.com/Kernel/KernelBisection#How_do_I_reverse_bisect_the_upstream_kernel.3F ?
Please note, finding adjacent kernel versions is not fully commit bisecting. Also, the kernel release names are irrelevant for the purposes of bisecting. It is most helpful that after the fix commit (not kernel version) has been identified, you then mark this report Status Confirmed. Thank you for your help. ** Tags removed: i915 kernel ** Tags added: kernel-fixed-upstream-4.8-rc3 latest-bios-1.4.4 needs-reverse-bisect -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1618600 Title: Unclaimed register detected after reading register 0x65f10 Status in linux package in Ubuntu: Incomplete Bug description: [ 215.297470] ------------[ cut here ]------------ [ 215.297522] WARNING: CPU: 0 PID: 1673 at /build/linux-rTsl6N/linux-4.4.0/ubuntu/i915/intel_uncore.c:804 __unclaimed_reg_debug+0x6b/0x80 [i915_bpo]() [ 215.297525] Unclaimed register detected after reading register 0x65f10 [ 215.297527] Modules linked in: nvram msr rfcomm cmac bnep uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core v4l2_common btusb videodev btrtl media snd_hda_codec_hdmi dell_led snd_hda_codec_realtek snd_hda_codec_generic hid_multitouch i2c_designware_platform dell_laptop i2c_designware_core dcdbas dell_wmi intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp nls_iso8859_1 kvm_intel kvm irqbypass snd_soc_skl snd_soc_skl_ipc snd_hda_ext_core crct10dif_pclmul snd_soc_sst_ipc crc32_pclmul snd_soc_sst_dsp snd_soc_core brcmfmac snd_compress ac97_bus snd_pcm_dmaengine dw_dmac_core snd_hda_intel brcmutil cfg80211 snd_hda_codec rtsx_pci_ms snd_hda_core memstick snd_hwdep aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_pcm cryptd snd_seq_midi snd_seq_midi_event snd_rawmidi [ 215.297587] input_leds snd_seq snd_seq_device snd_timer serio_raw snd soundcore shpchp mei_me idma64 mei virt_dma intel_lpss_pci processor_thermal_device intel_soc_dts_iosf hci_uart btbcm btqca btintel bluetooth intel_lpss_acpi intel_lpss acpi_pad int3403_thermal int340x_thermal_zone int3400_thermal acpi_thermal_rel intel_hid sparse_keymap acpi_als kfifo_buf industrialio joydev mac_hid parport_pc ppdev lp parport ip_tables x_tables autofs4 rtsx_pci_sdmmc i915_bpo intel_ips i2c_algo_bit psmouse drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops nvme drm rtsx_pci ahci libahci wmi i2c_hid hid pinctrl_sunrisepoint video pinctrl_intel fjes [ 215.297642] CPU: 0 PID: 1673 Comm: alsa-source-ALC Not tainted 4.4.0-9136-generic #55-Ubuntu [ 215.297645] Hardware name: Dell Inc. XPS 13 9350/0RH0V2, BIOS 1.4.4 06/14/2016 [ 215.297648] 0000000000000086 00000000e4fd464c ffff880060e23778 ffffffff813f13e3 [ 215.297652] ffff880060e237c0 ffffffffc02a17b8 ffff880060e237b0 ffffffff810810f2 [ 215.297657] 0000000000065f10 0000000000000000 0000000000000001 ffff88026eba0000 [ 215.297661] Call Trace: [ 215.297670] [<ffffffff813f13e3>] dump_stack+0x63/0x90 [ 215.297676] [<ffffffff810810f2>] warn_slowpath_common+0x82/0xc0 [ 215.297680] [<ffffffff8108118c>] warn_slowpath_fmt+0x5c/0x80 [ 215.297722] [<ffffffffc020279b>] __unclaimed_reg_debug+0x6b/0x80 [i915_bpo] [ 215.297760] [<ffffffffc02084a3>] gen9_read32+0x373/0x3a0 [i915_bpo] [ 215.297799] [<ffffffffc020f3e9>] i915_audio_component_codec_wake_override+0x39/0xb0 [i915_bpo] [ 215.297810] [<ffffffffc05e39bf>] snd_hdac_set_codec_wakeup+0x3f/0xa0 [snd_hda_core] [ 215.297815] [<ffffffffc0518127>] azx_runtime_resume+0x187/0x1b0 [snd_hda_intel] [ 215.297821] [<ffffffff81440ffb>] pci_pm_runtime_resume+0x7b/0xa0 [ 215.297827] [<ffffffff8155e6d3>] __rpm_callback+0x33/0x70 [ 215.297831] [<ffffffff81440f80>] ? pci_restore_standard_config+0x40/0x40 [ 215.297836] [<ffffffff8155e734>] rpm_callback+0x24/0x80 [ 215.297840] [<ffffffff81440f80>] ? pci_restore_standard_config+0x40/0x40 [ 215.297844] [<ffffffff8155eef7>] rpm_resume+0x497/0x6a0 [ 215.297849] [<ffffffff8155ed41>] rpm_resume+0x2e1/0x6a0 [ 215.297854] [<ffffffff8155f98e>] __pm_runtime_resume+0x4e/0x70 [ 215.297862] [<ffffffffc05deea3>] snd_hdac_power_up+0x13/0x20 [snd_hda_core] [ 215.297876] [<ffffffffc05fbc12>] azx_pcm_open+0x1d2/0x370 [snd_hda_codec] [ 215.297886] [<ffffffffc04f47bb>] snd_pcm_open_substream+0x7b/0x130 [snd_pcm] [ 215.297895] [<ffffffffc04f4927>] snd_pcm_open+0xb7/0x240 [snd_pcm] [ 215.297900] [<ffffffff811eb823>] ? kmem_cache_alloc_trace+0x183/0x1f0 [ 215.297905] [<ffffffff810ab149>] ? ttwu_do_wakeup+0x19/0xe0 [ 215.297908] [<ffffffff810ac0c0>] ? wake_up_q+0x70/0x70 [ 215.297916] [<ffffffffc04f4af7>] snd_pcm_capture_open+0x47/0x70 [snd_pcm] [ 215.297924] [<ffffffffc0479451>] snd_open+0xb1/0x180 [snd] [ 215.297930] [<ffffffff81211b8f>] chrdev_open+0xbf/0x1b0 [ 215.297934] [<ffffffff8120acef>] do_dentry_open+0x1ff/0x310 [ 215.297938] [<ffffffff81211ad0>] ? cdev_put+0x30/0x30 [ 215.297942] [<ffffffff8120be84>] vfs_open+0x54/0x80 [ 215.297946] [<ffffffff81217aeb>] ? may_open+0x5b/0xf0 [ 215.297951] [<ffffffff8121b667>] path_openat+0x1b7/0x1330 [ 215.297956] [<ffffffff8125233a>] ? inotify_handle_event+0xba/0x160 [ 215.297962] [<ffffffff8121d9d1>] do_filp_open+0x91/0x100 [ 215.297966] [<ffffffff812243e3>] ? dput+0xb3/0x220 [ 215.297970] [<ffffffff8122b266>] ? __alloc_fd+0x46/0x190 [ 215.297975] [<ffffffff8120c258>] do_sys_open+0x138/0x2a0 [ 215.297979] [<ffffffff8120c3de>] SyS_open+0x1e/0x20 [ 215.297983] [<ffffffff8182dff2>] entry_SYSCALL_64_fastpath+0x16/0x71 [ 215.297987] ---[ end trace 9dec7bbe5062d261 ]--- ProblemType: Bug DistroRelease: Ubuntu 16.10 Package: linux-image-4.4.0-9136-generic 4.4.0-9136.55 ProcVersionSignature: Ubuntu 4.4.0-9136.55-generic 4.4.16 Uname: Linux 4.4.0-9136-generic x86_64 ApportVersion: 2.20.3-0ubuntu7 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: dz0ny 1671 F.... pulseaudio CurrentDesktop: GNOME Date: Tue Aug 30 21:22:40 2016 HibernationDevice: RESUME=UUID=3a6c7883-5da1-4cbc-8f4d-2422f39d1043 InstallationDate: Installed on 2016-08-29 (1 days ago) InstallationMedia: Ubuntu-GNOME 16.10 "Yakkety Yak" - Alpha amd64 (20160823) MachineType: Dell Inc. XPS 13 9350 ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=sl_SI.UTF-8 SHELL=/usr/bin/fish ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-9136-generic.efi.signed root=UUID=f2a07204-d825-414c-ba21-a7c74c0e2295 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.4.0-9136-generic N/A linux-backports-modules-4.4.0-9136-generic N/A linux-firmware 1.160 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 06/14/2016 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.4.4 dmi.board.name: 0RH0V2 dmi.board.vendor: Dell Inc. dmi.board.version: X00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.4.4:bd06/14/2016:svnDellInc.:pnXPS139350:pvr:rvnDellInc.:rn0RH0V2:rvrX00:cvnDellInc.:ct9:cvr: dmi.product.name: XPS 13 9350 dmi.sys.vendor: Dell Inc. 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