[4.6.2] Unclaimed register detected after reading register 0x65f10

[4.6.2] Unclaimed register detected after reading register 0x65f10

[Daniel J Blueman]

Hi all,

Booting 4.6.2 on a Dell XPS 15 9550, nouveau dynamically powers down
the discrete GPU [1], tripping an interesting i915 warning [2].

Let me know if more information or debug is useful!

Thanks,
  Daniel

-- [1]

# cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynOff:0000:01:00.0

-- [2]

[   11.787732] nouveau 0000:01:00.0: DRM: evicting buffers...
[   11.787733] nouveau 0000:01:00.0: DRM: waiting for kernel channels
to go idle...
[   11.787757] nouveau 0000:01:00.0: DRM: suspending client object trees...
[   11.791623] nouveau 0000:01:00.0: DRM: suspending kernel object tree...
[   13.942725] ------------[ cut here ]------------
[   13.942794] WARNING: CPU: 0 PID: 1617 at
/home/kernel/COD/linux/drivers/gpu/drm/i915/intel_uncore.c:649
__unclaimed_reg_debug+0x80/0x90 [i915]
[   13.942796] Unclaimed register detected after reading register 0x65f10
[   13.942797] Modules linked in: ecb ecryptfs xt_CHECKSUM
iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat
nf_nat_ipv4 tun bridge stp llc ebtable_filter ebtables fuse msr
snd_hda_codec_hdmi dell_led snd_hda_codec_realtek
snd_hda_codec_generic dell_wmi snd_hda_intel dell_laptop snd_hda_codec
dell_smbios dcdbas snd_hda_core nls_iso8859_1 snd_hwdep intel_rapl
snd_pcm vfat fat x86_pkg_temp_thermal intel_powerclamp coretemp
snd_seq_midi snd_seq_midi_event snd_rawmidi crct10dif_pclmul
crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul
glue_helper brcmfmac ablk_helper uvcvideo snd_seq cryptd brcmutil
videobuf2_vmalloc snd_seq_device videobuf2_memops cfg80211 rtsx_pci_ms
videobuf2_v4l2 snd_timer memstick videobuf2_core efi_pstore input_leds
idma64 joydev snd videodev led_class
[   13.942884]  virt_dma processor_thermal_device efivars serio_raw
media soundcore shpchp intel_soc_dts_iosf intel_lpss_pci battery
hci_uart btbcm btqca btintel bluetooth int3403_thermal dell_smo8800
intel_hid intel_lpss_acpi int3402_thermal int3400_thermal intel_lpss
acpi_thermal_rel int340x_thermal_zone sparse_keymap mac_hid acpi_als
ac acpi_pad kfifo_buf industrialio processor kvm_intel kvm irqbypass
ipt_REJECT nf_reject_ipv4 xt_limit xt_tcpudp xt_addrtype
nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6_tables
nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat
nf_conntrack_ftp nf_conntrack iptable_filter parport_pc ip_tables
ppdev x_tables sunrpc lp parport efivarfs autofs4 ext4 crc16 jbd2
mbcache btrfs xor raid6_pq rtsx_pci_sdmmc nouveau i915 mxm_wmi
crc32c_intel ttm i2c_algo_bit
[   13.942958]  drm_kms_helper xhci_pci syscopyarea psmouse xhci_hcd
sysfillrect nvme sysimgblt fb_sys_fops drm usbcore nvme_core rtsx_pci
intel_gtt usb_common agpgart fan thermal i2c_hid hid wmi
pinctrl_sunrisepoint video pinctrl_intel button fjes
[   13.942992] CPU: 0 PID: 1617 Comm: pulseaudio Not tainted
4.6.2-040602-generic #201606100516
[   13.942994] Hardware name: Dell Inc. XPS 15 9550/0N7TVV, BIOS
01.02.00 04/07/2016
[   13.942995]  0000000000000086 00000000c60d671f ffff8804a27cf778
ffffffff8135f513
[   13.942998]  ffff8804a27cf7c8 0000000000000000 ffff8804a27cf7b8
ffffffff810814db
[   13.943000]  00000289c60d671f 0000000000000000 0000000000000001
0000000000065f10
[   13.943002] Call Trace:
[   13.943007]  [<ffffffff8135f513>] dump_stack+0x63/0x90
[   13.943009]  [<ffffffff810814db>] __warn+0xcb/0xf0
[   13.943011]  [<ffffffff8108155f>] warn_slowpath_fmt+0x5f/0x80
[   13.943035]  [<ffffffff811fd59a>] ? __slab_free+0x9a/0x2d0
[   13.943082]  [<ffffffffc0366e00>] __unclaimed_reg_debug+0x80/0x90 [i915]
[   13.943123]  [<ffffffffc036c8ab>] gen9_read32+0x35b/0x390 [i915]
[   13.943164]  [<ffffffffc0372e29>]
i915_audio_component_codec_wake_override+0x39/0xb0 [i915]
[   13.943171]  [<ffffffffc0cf4baf>]
snd_hdac_set_codec_wakeup+0x3f/0xa0 [snd_hda_core]
[   13.943174]  [<ffffffffc0a0ba2f>] azx_runtime_resume+0x17f/0x190
[snd_hda_intel]
[   13.943198]  [<ffffffff813b190b>] pci_pm_runtime_resume+0x7b/0xa0
[   13.943201]  [<ffffffff814b9533>] __rpm_callback+0x33/0x70
[   13.943204]  [<ffffffff813b1890>] ? pci_restore_standard_config+0x40/0x40
[   13.943206]  [<ffffffff814b9594>] rpm_callback+0x24/0x80
[   13.943209]  [<ffffffff813b1890>] ? pci_restore_standard_config+0x40/0x40
[   13.943211]  [<ffffffff814b9d41>] rpm_resume+0x491/0x690
[   13.943214]  [<ffffffff814b9b91>] rpm_resume+0x2e1/0x690
[   13.943237]  [<ffffffff814ba7ce>] __pm_runtime_resume+0x4e/0x70
[   13.943242]  [<ffffffffc0ceee83>] snd_hdac_power_up+0x13/0x20 [snd_hda_core]
[   13.943249]  [<ffffffffc0d0dc22>] azx_pcm_open+0x1d2/0x370 [snd_hda_codec]
[   13.943254]  [<ffffffffc0cda7cb>] snd_pcm_open_substream+0x7b/0x130 [snd_pcm]
[   13.943280]  [<ffffffffc0cda937>] snd_pcm_open+0xb7/0x240 [snd_pcm]
[   13.943283]  [<ffffffff811fcc06>] ? kmem_cache_alloc_trace+0x176/0x1e0
[   13.943285]  [<ffffffff810ad6c0>] ? wake_up_q+0x70/0x70
[   13.943289]  [<ffffffffc0cdab07>] snd_pcm_capture_open+0x47/0x70 [snd_pcm]
[   13.943321]  [<ffffffffc0a9f451>] snd_open+0xb1/0x180 [snd]
[   13.943323]  [<ffffffff8122703f>] chrdev_open+0xbf/0x1b0
[   13.943326]  [<ffffffff8121f65f>] do_dentry_open+0x1ff/0x310
[   13.943328]  [<ffffffff81226f80>] ? cdev_put+0x30/0x30
[   13.943330]  [<ffffffff81220b34>] vfs_open+0x54/0x80
[   13.943332]  [<ffffffff8122d79c>] ? may_open+0x8c/0x100
[   13.943334]  [<ffffffff81230f91>] path_openat+0x1b1/0x1490
[   13.943336]  [<ffffffff811953d4>] ? unlock_page+0x74/0x80
[   13.943338]  [<ffffffff81233461>] do_filp_open+0x91/0x100
[   13.943362]  [<ffffffff8123a0c3>] ? dput+0xb3/0x220
[   13.943364]  [<ffffffff81240ef6>] ? __alloc_fd+0x46/0x190
[   13.943367]  [<ffffffff81220ed4>] do_sys_open+0x124/0x210
[   13.943369]  [<ffffffff81220fde>] SyS_open+0x1e/0x20
[   13.943371]  [<ffffffff816a0b76>] entry_SYSCALL_64_fastpath+0x1e/0xa8
-- 
Daniel J Blueman
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