[Bug 95646] New: [i915] [SKL] Unclaimed register detected

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue May 24 11:12:06 UTC 2016 

https://bugs.freedesktop.org/show_bug.cgi?id=95646

            Bug ID: 95646
           Summary: [i915] [SKL] Unclaimed register detected
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: direx at betriebsdirektor.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

After a while I am getting the following warning on my Thinkpad L460:

[ 4355.571193] ------------[ cut here ]------------
[ 4355.571225] WARNING: CPU: 1 PID: 766 at
drivers/gpu/drm/i915/intel_uncore.c:649 __unclaimed_reg_debug+0x7b/0x90 [i915]
[ 4355.571227] Unclaimed register detected after reading register 0x65f10
[ 4355.571229] Modules linked in: msr cpufreq_stats sha256_ssse3 sha256_generic
hmac drbg ansi_cprng ctr ccm joydev mousedev snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic snd_soc_skl snd_soc_skl_ipc
snd_soc_sst_ipc snd_soc_sst_dsp snd_hda_ext_core snd_soc_sst_match snd_soc_core
snd_compress snd_pcm_dmaengine ac97_bus ipt_REJECT nf_reject_ipv4 xt_tcpudp
nf_conntrack_ipv6 nf_conntrack_ipv4 nf_defrag_ipv6 nf_defrag_ipv4 arc4
xt_conntrack nf_conntrack ip6table_filter ip6_tables iptable_filter iTCO_wdt
iTCO_vendor_support iwlmvm mac80211 i915 intel_rapl snd_hda_intel
x86_pkg_temp_thermal intel_powerclamp coretemp iwlwifi uvcvideo snd_hda_codec
videobuf2_vmalloc btusb kvm_intel drm_kms_helper videobuf2_memops evdev btrtl
input_leds btbcm videobuf2_v4l2 mac_hid snd_hda_core e1000e kvm snd_hwdep
[ 4355.571263]  videobuf2_core snd_pcm btintel psmouse ptp serio_raw pcspkr
pps_core irqbypass snd_timer i2c_i801 videodev cfg80211 drm bluetooth
thinkpad_acpi rtsx_pci_ms nvram memstick intel_gtt syscopyarea sysfillrect snd
sysimgblt mei_me fb_sys_fops soundcore media crc16 intel_pch_thermal
i2c_algo_bit mei shpchp thermal led_class wmi rfkill battery ac fjes tpm_crb
video tpm_tis tpm button processor sch_fq_codel ip_tables x_tables btrfs xor
raid6_pq algif_skcipher af_alg dm_crypt dm_mod sd_mod rtsx_pci_sdmmc mmc_core
atkbd libps2 crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel
aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd ahci libahci
xhci_pci libata xhci_hcd rtsx_pci scsi_mod usbcore usb_common i8042 serio
hid_microsoft hid
[ 4355.571349] CPU: 1 PID: 766 Comm: alsa-sink-ALC29 Not tainted 4.6.0-1-ARCH
#1
[ 4355.571350] Hardware name: LENOVO 20FVS01500/20FVS01500, BIOS R08ET40W (1.14
) 04/20/2016
[ 4355.571354]  0000000000000086 00000000b3dfe239 ffff8803fcab7768
ffffffff812e5362
[ 4355.571356]  ffff8803fcab77b8 0000000000000000 ffff8803fcab77a8
ffffffff8107a68b
[ 4355.571358]  000002892df6bfc0 0000000000000000 0000000000000001
0000000000065f10
[ 4355.571360] Call Trace:
[ 4355.571366]  [<ffffffff812e5362>] dump_stack+0x63/0x81
[ 4355.571369]  [<ffffffff8107a68b>] __warn+0xcb/0xf0
[ 4355.571373]  [<ffffffff8107a70f>] warn_slowpath_fmt+0x5f/0x80
[ 4355.571388]  [<ffffffffa09a286b>] __unclaimed_reg_debug+0x7b/0x90 [i915]
[ 4355.571399]  [<ffffffffa09a331e>] gen9_read32+0x33e/0x3b0 [i915]
[ 4355.571419]  [<ffffffffa09ad349>]
i915_audio_component_codec_wake_override+0x39/0xb0 [i915]
[ 4355.571419]  [<ffffffffa084edbf>] snd_hdac_set_codec_wakeup+0x3f/0xa0
[snd_hda_core]
[ 4355.571421]  [<ffffffffa07bd8f7>] hda_intel_init_chip+0x177/0x190
[snd_hda_intel]
[ 4355.571423]  [<ffffffffa07bd640>] ? azx_init_pci+0x170/0x2b0 [snd_hda_intel]
[ 4355.571425]  [<ffffffffa07bd9b3>] azx_runtime_resume+0xa3/0x1c0
[snd_hda_intel]
[ 4355.571430]  [<ffffffff8132d19b>] pci_pm_runtime_resume+0x7b/0xa0
[ 4355.571433]  [<ffffffff8132d120>] ? pci_restore_standard_config+0x40/0x40
[ 4355.571435]  [<ffffffff8141c192>] __rpm_callback+0x32/0x70
[ 4355.571437]  [<ffffffff8132d120>] ? pci_restore_standard_config+0x40/0x40
[ 4355.571438]  [<ffffffff8141c1f4>] rpm_callback+0x24/0x80
[ 4355.571440]  [<ffffffff8132d120>] ? pci_restore_standard_config+0x40/0x40
[ 4355.571442]  [<ffffffff8141d62c>] rpm_resume+0x4bc/0x6e0
[ 4355.571444]  [<ffffffff815c2dac>] ? schedule+0x3c/0x90
[ 4355.571446]  [<ffffffff8141d4d8>] rpm_resume+0x368/0x6e0
[ 4355.571450]  [<ffffffffa082f212>] ? snd_pcm_hw_rule_add+0x122/0x1d0
[snd_pcm]
[ 4355.571451]  [<ffffffff8141d88f>] __pm_runtime_resume+0x3f/0x60
[ 4355.571454]  [<ffffffffa0848ed3>] snd_hdac_power_up+0x13/0x20 [snd_hda_core]
[ 4355.571458]  [<ffffffffa071f119>] azx_pcm_open+0x1d9/0x390 [snd_hda_codec]
[ 4355.571461]  [<ffffffffa082e02b>] snd_pcm_open_substream+0x7b/0x130
[snd_pcm]
[ 4355.571467]  [<ffffffffa082e197>] snd_pcm_open+0xb7/0x250 [snd_pcm]
[ 4355.571470]  [<ffffffff81178988>] ? get_page_from_freelist+0x4a8/0xaa0
[ 4355.571472]  [<ffffffff810a4a80>] ? wake_up_q+0x70/0x70
[ 4355.571477]  [<ffffffffa082e3e4>] snd_pcm_playback_open+0x44/0x70 [snd_pcm]
[ 4355.571480]  [<ffffffffa03a6451>] snd_open+0xb1/0x180 [snd]
[ 4355.571485]  [<ffffffff811fbd40>] chrdev_open+0xb0/0x1e0
[ 4355.571488]  [<ffffffff811f4941>] do_dentry_open+0x201/0x2e0
[ 4355.571489]  [<ffffffff811fbc90>] ? cdev_put+0x30/0x30
[ 4355.571494]  [<ffffffff811f5a04>] vfs_open+0x54/0x80
[ 4355.571495]  [<ffffffff8120260c>] ? may_open+0x8c/0x100
[ 4355.571497]  [<ffffffff812054b7>] path_openat+0x4e7/0x1290
[ 4355.571499]  [<ffffffff81207651>] do_filp_open+0x91/0x100
[ 4355.571504]  [<ffffffff81216bec>] ? mntput_no_expire+0x2c/0x1b0
[ 4355.571505]  [<ffffffff812145a9>] ? __alloc_fd+0xc9/0x180
[ 4355.571507]  [<ffffffff811f5dd7>] do_sys_open+0x147/0x210
[ 4355.571512]  [<ffffffff811f5ebe>] SyS_open+0x1e/0x20
[ 4355.571514]  [<ffffffff815c6832>] entry_SYSCALL_64_fastpath+0x1a/0xa4
[ 4355.571516] ---[ end trace 1b5aef03c72bc70b ]---

There is at least on suspend/resume cycle involved, after the message pops up.
My setup:

* Lenovo Thinkpad L460 (Only using the internal display ATM)
* UEFI boot
* Arch Linux
* extra/xorg-server 1.18.3-1
* extra/xf86-video-intel 1:2.99.917+645+g88733a7-1
* Kernel 4.6.0

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