[Bug 93578] Intel HD 520 failed to train DP when connected with a external monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93578

--- Comment #30 from Jan <jan at wth.in> ---
I can confirm this problem with a Latitude E7270 (i7-6600U CPU) and an old
style Dell eDock:

Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel: WARNING: CPU: 0 PID: 7037 at
drivers/gpu/drm/i915/intel_pm.c:3553 skl_update_other_pipe_wm+0x191/0x1a0
[i915]()
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel: WARN_ON(!wm_changed)
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel: Modules linked in:
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  cmac rfcomm cpufreq_stats tun
snd_hda_codec_hdmi dell_led snd_hda_codec_realtek snd_hda_codec_generic
ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 ipt_REJECT nf_reject_ipv4 xt_conntrack
ebtable_nat ebtable_broute ebtable_filter ebtables ip6table_nat
nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security
ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4
nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security
iptable_raw iptable_filter bnep arc4 vfat fat dell_wmi ppdev sparse_keymap
dell_laptop dcdbas x86_pkg_temp_thermal intel_powerclamp iwlmvm coretemp
dell_smm_hwmon mac80211 kvm_intel kvm irqbypass snd_hda_intel snd_hda_codec
snd_hda_core snd_hwdep snd_seq snd_seq_device snd_pcm iwlwifi cfg80211
rtsx_pci_ms joydev pcspkr
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  memstick snd_timer uvcvideo
snd i2c_i801 soundcore videobuf2_vmalloc videobuf2_memops input_leds
videobuf2_v4l2 videobuf2_core shpchp i915 videodev mei_me mei btusb btrtl
i2c_algo_bit drm_kms_helper wmi drm hci_uart btbcm syscopyarea btqca
sysfillrect btintel sysimgblt parport_pc processor_thermal_device
intel_lpss_acpi int3400_thermal intel_soc_dts_iosf parport 8250_fintek
bluetooth video fb_sys_fops int3403_thermal intel_lpss dell_rbtn
acpi_thermal_rel int340x_thermal_zone tpm_crb rfkill acpi_pad acpi_als
kfifo_buf industrialio nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables
xfs libcrc32c dm_crypt hid_logitech_hidpp hid_logitech_dj crct10dif_pclmul
crc32_pclmul crc32c_intel ghash_clmulni_intel rtsx_pci_sdmmc mmc_core
aesni_intel glue_helper lrw gf128mul ablk_helper cryptd serio_raw
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  e1000e ptp pps_core rtsx_pci
mfd_core nvme ahci libahci libata i2c_hid fjes dm_mirror dm_region_hash dm_log
dm_mod
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel: CPU: 0 PID: 7037 Comm: X
Tainted: G        W       4.5.1-1.el7.elrepo.x86_64 #1
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel: Hardware name: Dell Inc.
Latitude E7270/0T0V7J, BIOS 1.4.2 03/04/2016
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  0000000000000286
00000000c3433af9 ffff8803c6347928 ffffffff8133b89f
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  ffff8803c6347970
ffffffffa070e4d0 ffff8803c6347960 ffffffff8107f136
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  ffff880439bfe000
ffff880439bf9000 0000000000000004 ffff880436fc23a8
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel: Call Trace:
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffff8133b89f>]
dump_stack+0x63/0x84
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffff8107f136>]
warn_slowpath_common+0x86/0xc0
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffff8107f1cc>]
warn_slowpath_fmt+0x5c/0x80
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffffa0648961>]
skl_update_other_pipe_wm+0x191/0x1a0 [i915]
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffffa0648b2f>]
skl_update_wm+0x1bf/0x6e0 [i915]
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffffa06926b3>] ?
gen9_write32+0x153/0x340 [i915]
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffffa06d0e6f>] ?
intel_ddi_enable_transcoder_func+0x17f/0x260 [i915]
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffffa064a0ae>]
intel_update_watermarks+0x1e/0x30 [i915]
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffffa06b4c51>]
haswell_crtc_enable+0x321/0x8d0 [i915]
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffffa06b193a>]
intel_atomic_commit+0x70a/0xa90 [i915]
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffffa05410d0>] ?
drm_atomic_check_only+0x130/0x5f0 [drm]
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffffa0540957>] ?
drm_atomic_set_crtc_for_connector+0x57/0xe0 [drm]
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffffa05415c7>]
drm_atomic_commit+0x37/0x60 [drm]
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffffa05a8247>]
drm_atomic_helper_set_config+0x77/0xb0 [drm_kms_helper]
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffffa0530b84>]
drm_mode_set_config_internal+0x64/0x100 [drm]
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffffa0534dcc>]
drm_mode_setcrtc+0xec/0x530 [drm]
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffffa052696d>]
drm_ioctl+0x25d/0x4f0 [drm]
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffffa0534ce0>] ?
drm_mode_setplane+0x1c0/0x1c0 [drm]
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffff8121d046>]
do_vfs_ioctl+0xa6/0x5c0
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffff8121d5d9>]
SyS_ioctl+0x79/0x90
Apr 18 14:49:46 its-a-trap.its.unibas.ch kernel:  [<ffffffff8170426e>]
entry_SYSCALL_64_fastpath+0x12/0x71

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