The above are logs of my system booting with 4.4.0-75-generic. And the
kern.log shows something related to drm on skylake:


   1 May 16 08:26:41 mtlb kernel: [238539.431888] ------------[ cut here 
]------------                                                                   
                                                   
   2 May 16 08:26:41 mtlb kernel: [238539.431974] WARNING: CPU: 0 PID: 2319 at 
/build/linux-Hlembm/linux-4.4.0/ubuntu/i915/intel_pm.c:3675 
skl_update_other_pipe_wm+0x16c/0x180 [i915_bpo]()
   3 May 16 08:26:41 mtlb kernel: [238539.431980] WARN_ON(!wm_changed)
   4 May 16 08:26:41 mtlb kernel: [238539.431984] Modules linked in: 
vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) nf_conntrack_netlink 
nfnetlink btrfs xor raid6_pq ufs qnx4 hfsplus hfs minix ntfs      msdos jfs xfs 
libcrc32c cpuid hid_generic usbhid drbg ansi_cprng ctr ccm scsi_transport_iscsi 
veth pci_stub xfrm_user xfrm_algo xt_addrtype xt_conntrack br_netfilter rfcomm 
aufs ip6table_filter ip6_     tables xt_CHECKSUM iptable_mangle xt_tcpudp 
ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment iptable_nat nf_conntrack_ipv4 
snd_hrtimer nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack bridge stp llc ip    
 table_filter ip_tables x_tables bnep binfmt_misc zfs(PO) zunicode(PO) 
zcommon(PO) znvpair(PO) spl(O) zavl(PO) r8712u(CE) joydev hid_multitouch arc4 
i2c_designware_platform i2c_designware_core asus_nb     _wmi asus_wmi 
snd_soc_skl sparse_keymap snd_hda_codec_hdmi snd_soc_skl_ipc snd_hda_ext_core 
snd_hda_codec_conexant snd_soc_sst_ipc snd_hda_codec_generic snd_soc_sst_dsp 
snd_soc_
 core snd_compress ac97     _bus snd_pcm_dmaengine dw_dmac_core snd_hda_intel 
snd_hda_codec snd_hda_core iwlmvm uvcvideo videobuf2_vmalloc snd_hwdep mac80211 
videobuf2_memops snd_pcm videobuf2_v4l2 videobuf2_core v4l2_common sn     
d_seq_midi snd_seq_midi_event videodev snd_rawmidi media snd_seq intel_rapl 
x86_pkg_temp_thermal intel_powerclamp btusb snd_seq_device coretemp btrtl 
iwlwifi snd_timer crct10dif_pclmul crc32_pclmul g     hash_clmulni_intel 
cfg80211 aesni_intel aes_x86_64 lrw gf128mul snd glue_helper ablk_helper cryptd 
input_leds soundcore serio_raw processor_thermal_device mei_me 
intel_soc_dts_iosf idma64 shpchp mei      virt_dma intel_lpss_pci hci_uart 
int3403_thermal btbcm btqca btintel bluetooth int3402_thermal int3400_thermal 
intel_lpss_acpi intel_lpss tpm_crb int340x_thermal_zone acpi_thermal_rel 
acpi_pad mac_hi     d kvm_intel kvm irqbypass parport_pc ppdev sunrpc lp 
parport autofs4 i915_bpo intel_ips i2c_algo_bit drm_kms_helper syscopyarea 
sysfillrect sysimgblt fb_s
 ys_fops ahci drm libahci wmi i2c_hid hid pinc     trl_sunrisepoint 
pinctrl_intel video fjes [last unloaded: vboxdrv]
   5 May 16 08:26:41 mtlb kernel: [238539.432322] CPU: 0 PID: 2319 Comm: Xorg 
Tainted: P        WC OE   4.4.0-75-generic #96-Ubuntu
   6 May 16 08:26:41 mtlb kernel: [238539.432327] Hardware name: ASUSTeK 
COMPUTER INC. UX360CA/UX360CA, BIOS UX360CA.202 02/17/2016
   7 May 16 08:26:41 mtlb kernel: [238539.432333]  0000000000000286 
00000000a255aaa5 ffff880078737920 ffffffff813f8493
   8 May 16 08:26:41 mtlb kernel: [238539.432343]  ffff880078737968 
ffffffffc0246b58 ffff880078737958 ffffffff81081302
   9 May 16 08:26:41 mtlb kernel: [238539.432352]  ffff88016a432000 
ffff88016a44a148 ffff88016a433000 ffff88016e12c378
  10 May 16 08:26:41 mtlb kernel: [238539.432360] Call Trace:
  11 May 16 08:26:41 mtlb kernel: [238539.432377]  [<ffffffff813f8493>] 
dump_stack+0x63/0x90
  12 May 16 08:26:41 mtlb kernel: [238539.432391]  [<ffffffff81081302>] 
warn_slowpath_common+0x82/0xc0
  13 May 16 08:26:41 mtlb kernel: [238539.432401]  [<ffffffff8108139c>] 
warn_slowpath_fmt+0x5c/0x80
  14 May 16 08:26:41 mtlb kernel: [238539.432462]  [<ffffffffc0167fec>] 
skl_update_other_pipe_wm+0x16c/0x180 [i915_bpo]
  15 May 16 08:26:41 mtlb kernel: [238539.432522]  [<ffffffffc0168185>] 
skl_update_wm+0x185/0x610 [i915_bpo]
  16 May 16 08:26:41 mtlb kernel: [238539.432613]  [<ffffffffc01f942f>] ? 
intel_ddi_enable_transcoder_func+0x17f/0x260 [i915_bpo]
  17 May 16 08:26:41 mtlb kernel: [238539.432672]  [<ffffffffc016bf0e>] 
intel_update_watermarks+0x1e/0x30 [i915_bpo]
  18 May 16 08:26:41 mtlb kernel: [238539.432761]  [<ffffffffc01db701>] 
haswell_crtc_enable+0x761/0x8e0 [i915_bpo]
  19 May 16 08:26:41 mtlb kernel: [238539.432850]  [<ffffffffc01d7606>] 
intel_atomic_commit+0x5d6/0x14a0 [i915_bpo]
  20 May 16 08:26:41 mtlb kernel: [238539.432916]  [<ffffffffc00c9bfe>] ? 
drm_atomic_check_only+0x18e/0x590 [drm]
  21 May 16 08:26:41 mtlb kernel: [238539.432972]  [<ffffffffc00ca037>] 
drm_atomic_commit+0x37/0x60 [drm]
  22 May 16 08:26:41 mtlb kernel: [238539.433003]  [<ffffffffc0119dc6>] 
drm_atomic_helper_set_config+0x76/0xb0 [drm_kms_helper]
  23 May 16 08:26:41 mtlb kernel: [238539.433051]  [<ffffffffc00b8e12>] 
drm_mode_set_config_internal+0x62/0x100 [drm]
  24 May 16 08:26:41 mtlb kernel: [238539.433100]  [<ffffffffc00bd46c>] 
drm_mode_setcrtc+0x3cc/0x4f0 [drm]
  25 May 16 08:26:41 mtlb kernel: [238539.433136]  [<ffffffffc00ae722>] 
drm_ioctl+0x152/0x540 [drm]
  26 May 16 08:26:41 mtlb kernel: [238539.433184]  [<ffffffffc00bd0a0>] ? 
drm_mode_setplane+0x1b0/0x1b0 [drm]
  27 May 16 08:26:41 mtlb kernel: [238539.433197]  [<ffffffff81222c6f>] 
do_vfs_ioctl+0x29f/0x490
  28 May 16 08:26:41 mtlb kernel: [238539.433207]  [<ffffffff8108e5a1>] ? 
__set_task_blocked+0x41/0xa0
  29 May 16 08:26:41 mtlb kernel: [238539.433218]  [<ffffffff81090f36>] ? 
__set_current_blocked+0x36/0x60
  30 May 16 08:26:41 mtlb kernel: [238539.433226]  [<ffffffff81222ed9>] 
SyS_ioctl+0x79/0x90
  31 May 16 08:26:41 mtlb kernel: [238539.433236]  [<ffffffff810911ee>] ? 
SyS_rt_sigprocmask+0x8e/0xc0
  32 May 16 08:26:41 mtlb kernel: [238539.433249]  [<ffffffff8183b972>] 
entry_SYSCALL_64_fastpath+0x16/0x71
  33 May 16 08:26:41 mtlb kernel: [238539.433256] ---[ end trace 
de268f92ce210bd7 ]---

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https://bugs.launchpad.net/bugs/1645056

Title:
  [Asus UX360UA] Unable to boot

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