Public bug reported:

Here is what I know so far:

After rebooting this morning on Bionic (after receiving the gnome theme
updates, I think), upon reboot the CPU pegs and the greeter is never
displayed (there is a graphics system running, but I'm not sure what
it's doing). My num lock / caps lock keys work, but the touchpad on the
laptop does nothing to the mouse.

If I boot with nomodeset, greeter does not freeze.

Finally, in either case, I am now unable to use my external monitor,
which worked fine before (connected over a USB-C to HDMI dongle).

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu5
ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
Uname: Linux 4.15.0-10-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: GNOME
Date: Mon Mar  5 11:47:53 2018
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GpuHangFrequency: This is the first time
GraphicsCard:
 Intel Corporation HD Graphics 520 [8086:1916] (rev 07) (prog-if 00 [VGA 
controller])
   Subsystem: Lenovo Skylake GT2 [HD Graphics 520] [17aa:3800]
InstallationDate: Installed on 2015-12-17 (809 days ago)
InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: LENOVO 80MK
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-10-generic 
root=UUID=c0742e7a-578f-4be5-bd9e-05b9e92f5b00 ro noprompt persistent quiet 
splash nomodeset
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/29/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: C6CN34WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: VIUU4
dmi.board.vendor: LENOVO
dmi.board.version: SDK0K45914 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo YOGA 900-13ISK
dmi.modalias: 
dmi:bvnLENOVO:bvrC6CN34WW:bd10/29/2015:svnLENOVO:pn80MK:pvrLenovoYOGA900-13ISK:rvnLENOVO:rnVIUU4:rvrSDK0K45914WIN:cvnLENOVO:ct10:cvrLenovoYOGA900-13ISK:
dmi.product.family: IDEAPAD
dmi.product.name: 80MK
dmi.product.version: Lenovo YOGA 900-13ISK
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.13.1+18.04.20180302-0ubuntu1
version.libdrm2: libdrm2 2.4.90-1
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc4-1ubuntu3
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc4-1ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.10.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
xserver.bootTime: Mon Mar  5 11:17:58 2018
xserver.configfile: default
xserver.errors:
 open /dev/dri/card0: No such file or directory
 open /dev/dri/card0: No such file or directory
 Screen 0 deleted because of no matching config section.
 AIGLX: reverting to software rendering
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 
xserver.version: 2:1.19.6-1ubuntu2

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


** Tags: amd64 apport-bug bionic freeze has-workaround regression reproducible 
single-occurrence ubuntu

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https://bugs.launchpad.net/bugs/1753576

Title:
  Xorg freeze

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