[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 #29 from Jaroslaw Cengelenga <behem6 at gmail.com> ---
Dell XPS 13 9350
DA200
Ubuntu 16.04
4.4.0-18-generic

same issues:
------------------
[  131.443670] ------------[ cut here ]------------
[  131.443707] WARNING: CPU: 2 PID: 1388 at
/build/linux-XwpX40/linux-4.4.0/ubuntu/i915/intel_pm.c:3572
skl_update_other_pipe_wm+0x16c/0x180 [i915_bpo]()
[  131.443709] WARN_ON(!wm_changed)
[  131.443710] Modules linked in: rfcomm bnep binfmt_misc nls_iso8859_1
snd_hda_codec_hdmi dell_led snd_soc_skl snd_soc_skl_ipc snd_hda_ext_core
snd_soc_sst_ipc snd_soc_sst_dsp snd_hda_codec_realtek i2c_designware_platform
snd_hda_codec_generic snd_soc_core i2c_designware_core snd_compress ac97_bus
dell_laptop dcdbas dell_wmi snd_pcm_dmaengine sparse_keymap intel_rapl
dw_dmac_core x86_pkg_temp_thermal intel_powerclamp snd_hda_intel coretemp
snd_hda_codec kvm_intel snd_hda_core snd_hwdep snd_pcm kvm brcmfmac
snd_seq_midi snd_seq_midi_event snd_rawmidi brcmutil snd_seq irqbypass
rtsx_pci_ms snd_seq_device cfg80211 snd_timer memstick snd joydev input_leds
serio_raw soundcore btusb btrtl hid_multitouch mei_me idma64 virt_dma mei
shpchp processor_thermal_device intel_soc_dts_iosf intel_lpss_pci hci_uart
btbcm btqca btintel bluetooth intel_lpss_acpi int3400_thermal intel_lpss
int3403_thermal int340x_thermal_zone acpi_thermal_rel acpi_pad mac_hid acpi_als
kfifo_buf industrialio parport_pc ppdev lp parport autofs4 drbg ansi_cprng
algif_skcipher af_alg dm_crypt usbhid crct10dif_pclmul crc32_pclmul
rtsx_pci_sdmmc i915_bpo aesni_intel aes_x86_64 lrw gf128mul glue_helper
ablk_helper cryptd intel_ips psmouse i2c_algo_bit drm_kms_helper syscopyarea
sysfillrect sysimgblt nvme fb_sys_fops ahci rtsx_pci drm libahci wmi i2c_hid
hid pinctrl_sunrisepoint video pinctrl_intel fjes
[  131.443761] CPU: 2 PID: 1388 Comm: Xorg Not tainted 4.4.0-18-generic
#34-Ubuntu
[  131.443762] Hardware name: Dell Inc. XPS 13 9350/07TYC2, BIOS 1.2.3
01/08/2016
[  131.443763]  0000000000000286 0000000023ce7b3d ffff8800618c7938
ffffffff813e9243
[  131.443765]  ffff8800618c7980 ffffffffc0375c70 ffff8800618c7970
ffffffff81080f62
[  131.443766]  ffff880276fc4000 ffff8800354e9d9c ffff880276fc3000
ffff8802713f3b78
[  131.443768] Call Trace:
[  131.443772]  [<ffffffff813e9243>] dump_stack+0x63/0x90
[  131.443775]  [<ffffffff81080f62>] warn_slowpath_common+0x82/0xc0
[  131.443777]  [<ffffffff81080ffc>] warn_slowpath_fmt+0x5c/0x80
[  131.443789]  [<ffffffffc02a75cc>] skl_update_other_pipe_wm+0x16c/0x180
[i915_bpo]
[  131.443799]  [<ffffffffc02a7766>] skl_update_wm+0x186/0x5f0 [i915_bpo]
[  131.443815]  [<ffffffffc033336f>] ?
intel_ddi_enable_transcoder_func+0x17f/0x260 [i915_bpo]
[  131.443825]  [<ffffffffc02ab48e>] intel_update_watermarks+0x1e/0x30
[i915_bpo]
[  131.443840]  [<ffffffffc0317401>] haswell_crtc_enable+0x321/0x8c0 [i915_bpo]
[  131.443855]  [<ffffffffc0313dad>] intel_atomic_commit+0x5dd/0xdb0 [i915_bpo]
[  131.443870]  [<ffffffffc00c580e>] ? drm_atomic_check_only+0x18e/0x590 [drm]
[  131.443880]  [<ffffffffc00c5c47>] drm_atomic_commit+0x37/0x60 [drm]
[  131.443886]  [<ffffffffc0146a06>] drm_atomic_helper_set_config+0x76/0xb0
[drm_kms_helper]
[  131.443894]  [<ffffffffc00b4e02>] drm_mode_set_config_internal+0x62/0x100
[drm]
[  131.443903]  [<ffffffffc00b9322>] drm_mode_setcrtc+0x3d2/0x4f0 [drm]
[  131.443909]  [<ffffffffc00aa712>] drm_ioctl+0x152/0x540 [drm]
[  131.443918]  [<ffffffffc00b8f50>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
[  131.443920]  [<ffffffff8121ff9f>] do_vfs_ioctl+0x29f/0x490
[  131.443923]  [<ffffffff8108e081>] ? __set_task_blocked+0x41/0xa0
[  131.443924]  [<ffffffff81090a16>] ? __set_current_blocked+0x36/0x60
[  131.443926]  [<ffffffff81220209>] SyS_ioctl+0x79/0x90
[  131.443927]  [<ffffffff81090cce>] ? SyS_rt_sigprocmask+0x8e/0xc0
[  131.443930]  [<ffffffff818243b2>] entry_SYSCALL_64_fastpath+0x16/0x71
[  131.443932] ---[ end trace 662309410218f706 ]---
[  139.097064] ------------[ cut here ]------------

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