Public bug reported:

After updating to linux 4.15.0-13-generic, the system freezes at boot,
apparently when the nouveau driver tries to start.  The console is still
in 80x25 text mode at this point.  No panic or error message is
displayed, only unrelated log messages (screenshot attached).

Booting in recovery mode is possible and allows X11 to start using the
vesa driver.

nouveau still works fine when booting an older kernel
(4.13.0-36-generic) so this problem seems to be specific to 4.15.0.

ProblemType: Bug
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
Date: Wed Apr 11 17:25:27 2018
Dependencies:
 adduser 3.113+nmu3ubuntu4
 apt 1.2.26
 apt-utils 1.2.26
 busybox-initramfs 1:1.22.0-15ubuntu1
 coreutils 8.25-2ubuntu3~16.04
 cpio 2.11+dfsg-5ubuntu1
 debconf 1.5.58ubuntu1
 debianutils 4.7
 dpkg 1.18.4ubuntu1.4
 e2fslibs 1.42.13-1ubuntu1
 e2fsprogs 1.42.13-1ubuntu1
 gcc-5-base 5.4.0-6ubuntu1~16.04.9
 gcc-6-base 6.0.1-0ubuntu1
 gettext-base 0.19.7-2ubuntu3
 gnupg 1.4.20-1ubuntu3.1
 gpgv 1.4.20-1ubuntu3.1
 grub-common 2.02~beta2-36ubuntu3.17
 grub-gfxpayload-lists 0.7
 grub-pc 2.02~beta2-36ubuntu3.17
 grub-pc-bin 2.02~beta2-36ubuntu3.17
 grub2-common 2.02~beta2-36ubuntu3.17
 init-system-helpers 1.29ubuntu4
 initramfs-tools 0.122ubuntu8.11
 initramfs-tools-bin 0.122ubuntu8.11
 initramfs-tools-core 0.122ubuntu8.11
 initscripts 2.88dsf-59.3ubuntu2
 insserv 1.14.0-5ubuntu3
 klibc-utils 2.0.4-8ubuntu1.16.04.4
 kmod 22-1ubuntu5
 libacl1 2.2.52-3
 libapt-inst2.0 1.2.26
 libapt-pkg5.0 1.2.26
 libasprintf0v5 0.19.7-2ubuntu3
 libattr1 1:2.4.47-2
 libaudit-common 1:2.4.5-1ubuntu2.1
 libaudit1 1:2.4.5-1ubuntu2.1
 libblkid1 2.27.1-6ubuntu3.4
 libbz2-1.0 1.0.6-8
 libc6 2.23-0ubuntu10
 libcomerr2 1.42.13-1ubuntu1
 libdb5.3 5.3.28-11ubuntu0.1
 libdevmapper1.02.1 2:1.02.110-1ubuntu10
 libfdisk1 2.27.1-6ubuntu3.4
 libfreetype6 2.6.1-0.1ubuntu2.3
 libfuse2 2.9.4-1ubuntu3.1
 libgcc1 1:6.0.1-0ubuntu1
 libgcrypt20 1.6.5-2ubuntu0.4
 libgpg-error0 1.21-2ubuntu1
 libgpm2 1.20.4-6.1
 libklibc 2.0.4-8ubuntu1.16.04.4
 libkmod2 22-1ubuntu5
 liblz4-1 0.0~r131-2ubuntu2
 liblzma5 5.1.1alpha+20120614-2ubuntu2
 libmount1 2.27.1-6ubuntu3.4
 libncurses5 6.0+20160213-1ubuntu1
 libncursesw5 6.0+20160213-1ubuntu1
 libpam-modules 1.1.8-3.2ubuntu2
 libpam-modules-bin 1.1.8-3.2ubuntu2
 libpam0g 1.1.8-3.2ubuntu2
 libpcre3 2:8.38-3.1
 libpng12-0 1.2.54-1ubuntu1
 libprocps4 2:3.3.10-4ubuntu2.3
 libreadline6 6.3-8ubuntu2
 libselinux1 2.4-3build2
 libsemanage-common 2.3-1build3
 libsemanage1 2.3-1build3
 libsepol1 2.4-2
 libsmartcols1 2.27.1-6ubuntu3.4
 libss2 1.42.13-1ubuntu1
 libstdc++6 5.4.0-6ubuntu1~16.04.9
 libsystemd0 229-4ubuntu21.2
 libtinfo5 6.0+20160213-1ubuntu1
 libudev1 229-4ubuntu21.2
 libusb-0.1-4 2:0.1.12-28
 libustr-1.0-1 1.0.4-5
 libuuid1 2.27.1-6ubuntu3.4
 linux-base 4.0ubuntu1
 lsb-base 9.20160110ubuntu0.2
 mount 2.27.1-6ubuntu3.4
 multiarch-support 2.23-0ubuntu10
 os-prober 1.70ubuntu3.3
 passwd 1:4.2-3.1ubuntu5.3
 perl-base 5.22.1-9ubuntu0.2
 procps 2:3.3.10-4ubuntu2.3
 psmisc 22.21-2.1build1
 readline-common 6.3-8ubuntu2
 sensible-utils 0.0.9ubuntu0.16.04.1
 sysv-rc 2.88dsf-59.3ubuntu2
 sysvinit-utils 2.88dsf-59.3ubuntu2
 tar 1.28-2.1ubuntu0.1
 ubuntu-keyring 2012.05.19
 ucf 3.0036
 udev 229-4ubuntu21.2
 util-linux 2.27.1-6ubuntu3.4
 uuid-runtime 2.27.1-6ubuntu3.4
 zlib1g 1:1.2.8.dfsg-2ubuntu4.1
DistroRelease: Ubuntu 16.04
InstallationDate: Installed on 2017-02-01 (434 days ago)
InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
JournalErrors:
 -- Logs begin at Wed 2018-04-11 17:25:19 EDT, end at Wed 2018-04-11 17:25:22 
EDT. --
 Apr 11 17:25:19 hostname kernel: Intel Spectre v2 broken microcode detected; 
disabling Speculation Control
 Apr 11 17:25:19 hostname kernel: ENERGY_PERF_BIAS: Set to 'normal', was 
'performance'
 Apr 11 17:25:19 hostname kernel: ENERGY_PERF_BIAS: View and update with 
x86_energy_perf_policy(8)
 Apr 11 17:25:19 hostname kernel: resource sanity check: requesting [mem 
0xfed10000-0xfed15fff], which spans more than pnp 00:01 [mem 
0xfed10000-0xfed13fff]
 Apr 11 17:25:19 hostname kernel: caller snb_uncore_imc_init_box+0x6b/0xb0 
mapping multiple BARs
 Apr 11 17:25:19 hostname kernel: (NULL device *): hwmon_device_register() is 
deprecated. Please convert the driver to use hwmon_device_register_with_info().
 Apr 11 17:25:19 hostname kernel: usb: port power management may be unreliable
 Apr 11 17:25:19 hostname kernel: [Firmware Bug]: ACPI(PEGP) defines _DOD but 
not _DOS
 Apr 11 17:25:19 hostname kernel: acpi PNP0C14:01: duplicate WMI GUID 
05901221-D566-11D1-B2F0-00A0C9062910 (first instance was on PNP0C14:00)
 Apr 11 17:25:19 hostname kernel: acpi PNP0C14:02: duplicate WMI GUID 
05901221-D566-11D1-B2F0-00A0C9062910 (first instance was on PNP0C14:00)
 Apr 11 17:25:19 hostname kernel: ata4.00: supports DRM functions and may not 
be fully accessible
 Apr 11 17:25:19 hostname kernel: ata4.00: supports DRM functions and may not 
be fully accessible
 Apr 11 17:25:19 hostname kernel: (NULL device *): hwmon_device_register() is 
deprecated. Please convert the driver to use hwmon_device_register_with_info().
 Apr 11 17:25:19 hostname kernel: platform regulatory.0: Direct firmware load 
for regulatory.db failed with error -2
 Apr 11 17:25:19 hostname systemd-tmpfiles[405]: 
[/usr/lib/tmpfiles.d/var.conf:14] Duplicate line for path "/var/log", ignoring.
 Apr 11 17:25:19 hostname kernel: iwlwifi 0000:04:00.0: Direct firmware load 
for iwlwifi-8000C-34.ucode failed with error -2
 Apr 11 17:25:19 hostname kernel: iwlwifi 0000:04:00.0: Direct firmware load 
for iwlwifi-8000C-33.ucode failed with error -2
 Apr 11 17:25:19 hostname kernel: iwlwifi 0000:04:00.0: Direct firmware load 
for iwlwifi-8000C-32.ucode failed with error -2
 Apr 11 17:25:19 hostname kernel: (NULL device *): hwmon_device_register() is 
deprecated. Please convert the driver to use hwmon_device_register_with_info().
 Apr 11 17:25:19 hostname kernel: thermal thermal_zone3: failed to read out 
thermal zone (-61)
Package: linux-image-4.15.0-13-generic 4.15.0-13.14~16.04.1
PackageArchitecture: amd64
ProcCpuinfoMinimal:
 processor      : 7
 vendor_id      : GenuineIntel
 cpu family     : 6
 model          : 94
 model name     : Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz
 stepping       : 3
 microcode      : 0xc2
 cpu MHz                : 3535.950
 cache size     : 8192 KB
 physical id    : 0
 siblings       : 8
 core id                : 3
 cpu cores      : 4
 apicid         : 7
 initial apicid : 7
 fpu            : yes
 fpu_exception  : yes
 cpuid level    : 22
 wp             : yes
 flags          : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb 
rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology 
nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl 
vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe 
popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch 
cpuid_fault epb invpcid_single pti tpr_shadow vnmi flexpriority ept vpid 
fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx rdseed adx 
smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts 
hwp hwp_notify hwp_act_window hwp_epp
 bugs           : cpu_meltdown spectre_v1 spectre_v2
 bogomips       : 5424.00
 clflush size   : 64
 cache_alignment        : 64
 address sizes  : 39 bits physical, 48 bits virtual
 power management:
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 4.15.0-13.14~16.04.1-generic 4.15.10
SourcePackage: linux-hwe-edge
Tags:  xenial
Uname: Linux 4.15.0-13-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
_MarkForUpload: True

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Screenshot of console at time of freeze"
   
https://bugs.launchpad.net/bugs/1763189/+attachment/5111336/+files/IMG_20180411_171715282.jpg

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https://bugs.launchpad.net/bugs/1763189

Title:
  kernel 4.15 breaks nouveau on Lenovo P50

Status in linux package in Ubuntu:
  New

Bug description:
  After updating to linux 4.15.0-13-generic, the system freezes at boot,
  apparently when the nouveau driver tries to start.  The console is
  still in 80x25 text mode at this point.  No panic or error message is
  displayed, only unrelated log messages (screenshot attached).

  Booting in recovery mode is possible and allows X11 to start using the
  vesa driver.

  nouveau still works fine when booting an older kernel
  (4.13.0-36-generic) so this problem seems to be specific to 4.15.0.

  ProblemType: Bug
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  Date: Wed Apr 11 17:25:27 2018
  Dependencies:
   adduser 3.113+nmu3ubuntu4
   apt 1.2.26
   apt-utils 1.2.26
   busybox-initramfs 1:1.22.0-15ubuntu1
   coreutils 8.25-2ubuntu3~16.04
   cpio 2.11+dfsg-5ubuntu1
   debconf 1.5.58ubuntu1
   debianutils 4.7
   dpkg 1.18.4ubuntu1.4
   e2fslibs 1.42.13-1ubuntu1
   e2fsprogs 1.42.13-1ubuntu1
   gcc-5-base 5.4.0-6ubuntu1~16.04.9
   gcc-6-base 6.0.1-0ubuntu1
   gettext-base 0.19.7-2ubuntu3
   gnupg 1.4.20-1ubuntu3.1
   gpgv 1.4.20-1ubuntu3.1
   grub-common 2.02~beta2-36ubuntu3.17
   grub-gfxpayload-lists 0.7
   grub-pc 2.02~beta2-36ubuntu3.17
   grub-pc-bin 2.02~beta2-36ubuntu3.17
   grub2-common 2.02~beta2-36ubuntu3.17
   init-system-helpers 1.29ubuntu4
   initramfs-tools 0.122ubuntu8.11
   initramfs-tools-bin 0.122ubuntu8.11
   initramfs-tools-core 0.122ubuntu8.11
   initscripts 2.88dsf-59.3ubuntu2
   insserv 1.14.0-5ubuntu3
   klibc-utils 2.0.4-8ubuntu1.16.04.4
   kmod 22-1ubuntu5
   libacl1 2.2.52-3
   libapt-inst2.0 1.2.26
   libapt-pkg5.0 1.2.26
   libasprintf0v5 0.19.7-2ubuntu3
   libattr1 1:2.4.47-2
   libaudit-common 1:2.4.5-1ubuntu2.1
   libaudit1 1:2.4.5-1ubuntu2.1
   libblkid1 2.27.1-6ubuntu3.4
   libbz2-1.0 1.0.6-8
   libc6 2.23-0ubuntu10
   libcomerr2 1.42.13-1ubuntu1
   libdb5.3 5.3.28-11ubuntu0.1
   libdevmapper1.02.1 2:1.02.110-1ubuntu10
   libfdisk1 2.27.1-6ubuntu3.4
   libfreetype6 2.6.1-0.1ubuntu2.3
   libfuse2 2.9.4-1ubuntu3.1
   libgcc1 1:6.0.1-0ubuntu1
   libgcrypt20 1.6.5-2ubuntu0.4
   libgpg-error0 1.21-2ubuntu1
   libgpm2 1.20.4-6.1
   libklibc 2.0.4-8ubuntu1.16.04.4
   libkmod2 22-1ubuntu5
   liblz4-1 0.0~r131-2ubuntu2
   liblzma5 5.1.1alpha+20120614-2ubuntu2
   libmount1 2.27.1-6ubuntu3.4
   libncurses5 6.0+20160213-1ubuntu1
   libncursesw5 6.0+20160213-1ubuntu1
   libpam-modules 1.1.8-3.2ubuntu2
   libpam-modules-bin 1.1.8-3.2ubuntu2
   libpam0g 1.1.8-3.2ubuntu2
   libpcre3 2:8.38-3.1
   libpng12-0 1.2.54-1ubuntu1
   libprocps4 2:3.3.10-4ubuntu2.3
   libreadline6 6.3-8ubuntu2
   libselinux1 2.4-3build2
   libsemanage-common 2.3-1build3
   libsemanage1 2.3-1build3
   libsepol1 2.4-2
   libsmartcols1 2.27.1-6ubuntu3.4
   libss2 1.42.13-1ubuntu1
   libstdc++6 5.4.0-6ubuntu1~16.04.9
   libsystemd0 229-4ubuntu21.2
   libtinfo5 6.0+20160213-1ubuntu1
   libudev1 229-4ubuntu21.2
   libusb-0.1-4 2:0.1.12-28
   libustr-1.0-1 1.0.4-5
   libuuid1 2.27.1-6ubuntu3.4
   linux-base 4.0ubuntu1
   lsb-base 9.20160110ubuntu0.2
   mount 2.27.1-6ubuntu3.4
   multiarch-support 2.23-0ubuntu10
   os-prober 1.70ubuntu3.3
   passwd 1:4.2-3.1ubuntu5.3
   perl-base 5.22.1-9ubuntu0.2
   procps 2:3.3.10-4ubuntu2.3
   psmisc 22.21-2.1build1
   readline-common 6.3-8ubuntu2
   sensible-utils 0.0.9ubuntu0.16.04.1
   sysv-rc 2.88dsf-59.3ubuntu2
   sysvinit-utils 2.88dsf-59.3ubuntu2
   tar 1.28-2.1ubuntu0.1
   ubuntu-keyring 2012.05.19
   ucf 3.0036
   udev 229-4ubuntu21.2
   util-linux 2.27.1-6ubuntu3.4
   uuid-runtime 2.27.1-6ubuntu3.4
   zlib1g 1:1.2.8.dfsg-2ubuntu4.1
  DistroRelease: Ubuntu 16.04
  InstallationDate: Installed on 2017-02-01 (434 days ago)
  InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  JournalErrors:
   -- Logs begin at Wed 2018-04-11 17:25:19 EDT, end at Wed 2018-04-11 17:25:22 
EDT. --
   Apr 11 17:25:19 hostname kernel: Intel Spectre v2 broken microcode detected; 
disabling Speculation Control
   Apr 11 17:25:19 hostname kernel: ENERGY_PERF_BIAS: Set to 'normal', was 
'performance'
   Apr 11 17:25:19 hostname kernel: ENERGY_PERF_BIAS: View and update with 
x86_energy_perf_policy(8)
   Apr 11 17:25:19 hostname kernel: resource sanity check: requesting [mem 
0xfed10000-0xfed15fff], which spans more than pnp 00:01 [mem 
0xfed10000-0xfed13fff]
   Apr 11 17:25:19 hostname kernel: caller snb_uncore_imc_init_box+0x6b/0xb0 
mapping multiple BARs
   Apr 11 17:25:19 hostname kernel: (NULL device *): hwmon_device_register() is 
deprecated. Please convert the driver to use hwmon_device_register_with_info().
   Apr 11 17:25:19 hostname kernel: usb: port power management may be unreliable
   Apr 11 17:25:19 hostname kernel: [Firmware Bug]: ACPI(PEGP) defines _DOD but 
not _DOS
   Apr 11 17:25:19 hostname kernel: acpi PNP0C14:01: duplicate WMI GUID 
05901221-D566-11D1-B2F0-00A0C9062910 (first instance was on PNP0C14:00)
   Apr 11 17:25:19 hostname kernel: acpi PNP0C14:02: duplicate WMI GUID 
05901221-D566-11D1-B2F0-00A0C9062910 (first instance was on PNP0C14:00)
   Apr 11 17:25:19 hostname kernel: ata4.00: supports DRM functions and may not 
be fully accessible
   Apr 11 17:25:19 hostname kernel: ata4.00: supports DRM functions and may not 
be fully accessible
   Apr 11 17:25:19 hostname kernel: (NULL device *): hwmon_device_register() is 
deprecated. Please convert the driver to use hwmon_device_register_with_info().
   Apr 11 17:25:19 hostname kernel: platform regulatory.0: Direct firmware load 
for regulatory.db failed with error -2
   Apr 11 17:25:19 hostname systemd-tmpfiles[405]: 
[/usr/lib/tmpfiles.d/var.conf:14] Duplicate line for path "/var/log", ignoring.
   Apr 11 17:25:19 hostname kernel: iwlwifi 0000:04:00.0: Direct firmware load 
for iwlwifi-8000C-34.ucode failed with error -2
   Apr 11 17:25:19 hostname kernel: iwlwifi 0000:04:00.0: Direct firmware load 
for iwlwifi-8000C-33.ucode failed with error -2
   Apr 11 17:25:19 hostname kernel: iwlwifi 0000:04:00.0: Direct firmware load 
for iwlwifi-8000C-32.ucode failed with error -2
   Apr 11 17:25:19 hostname kernel: (NULL device *): hwmon_device_register() is 
deprecated. Please convert the driver to use hwmon_device_register_with_info().
   Apr 11 17:25:19 hostname kernel: thermal thermal_zone3: failed to read out 
thermal zone (-61)
  Package: linux-image-4.15.0-13-generic 4.15.0-13.14~16.04.1
  PackageArchitecture: amd64
  ProcCpuinfoMinimal:
   processor    : 7
   vendor_id    : GenuineIntel
   cpu family   : 6
   model                : 94
   model name   : Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz
   stepping     : 3
   microcode    : 0xc2
   cpu MHz              : 3535.950
   cache size   : 8192 KB
   physical id  : 0
   siblings     : 8
   core id              : 3
   cpu cores    : 4
   apicid               : 7
   initial apicid       : 7
   fpu          : yes
   fpu_exception        : yes
   cpuid level  : 22
   wp           : yes
   flags                : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge 
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx 
pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl 
xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 
monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 
x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 
3dnowprefetch cpuid_fault epb invpcid_single pti tpr_shadow vnmi flexpriority 
ept vpid fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx 
rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm ida 
arat pln pts hwp hwp_notify hwp_act_window hwp_epp
   bugs         : cpu_meltdown spectre_v1 spectre_v2
   bogomips     : 5424.00
   clflush size : 64
   cache_alignment      : 64
   address sizes        : 39 bits physical, 48 bits virtual
   power management:
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 4.15.0-13.14~16.04.1-generic 4.15.10
  SourcePackage: linux-hwe-edge
  Tags:  xenial
  Uname: Linux 4.15.0-13-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  _MarkForUpload: True

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