Public bug reported:

I have my new laptop, Lenovo 720s-13ARR shipped with the latest Ryzen 5 2500U, 
installed Ubuntu 17.10, it seems everything works except Wifi and GPU. After 
changing the wifi card with Intel 8265 and manually upgrading kernel with 
M-bab's build from ''. 
Wifi and Gpu are working. But if I use mpv playing a video, when I try to 
resume the window from fullscreen, the screen freezes. Same thing happens when 
I use cheese, the camera app. Nothing I can do except a hard poweroff. After 
suffering that couple of times, I started to look for solutions from Internet. 
There are many error messages I can see if I use 'dmesg -l err' in the 
terminal. I cannot solve most of them, only use pci=noaer in the grub to 
suppress the "PCIe bus error", which keep increasing my "/var/log/kern.log" 
file size hundreds MB per hour before.
One more thing, if I start a reboot, the laptop might have a random hang on 
ubuntu logo screen. To avoid this, I have to poweroff first, then press power 
button to implement a 'reboot'. No idea for me in which part problem should be 
responsible for these failures.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: xorg 1:7.7+19ubuntu3
Uname: Linux 4.15.4+ x86_64
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CompositorRunning: None
CurrentDesktop: ubuntu-communitheme:ubuntu:GNOME
Date: Thu Feb 22 21:53:01 2018
DistUpgraded: Fresh install
DistroCodename: artful
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GpuHangFrequency: I don't know
 Advanced Micro Devices, Inc. [AMD/ATI] Device [1002:15dd] (rev c4) (prog-if 00 
[VGA controller])
   Subsystem: Lenovo Device [17aa:380c]
InstallationDate: Installed on 2018-01-30 (22 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
MachineType: LENOVO 81BR
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.4+ 
root=UUID=399cfaf6-9c73-4786-8ef5-bd331d20aadc ro pci=noaer 
ivrs_ioapic[4]=00:14.0 ivrs_ioapic[5]=00:00.1 quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: No upgrade log present (probably fresh install) 12/19/2017
dmi.bios.vendor: LENOVO
dmi.bios.version: 6KCN28WW
dmi.board.asset.tag: NO Asset Tag LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: SDK0L77769 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo ideapad 720S-13ARR
dmi:bvnLENOVO:bvr6KCN28WW:bd12/19/2017:svnLENOVO:pn81BR:pvrLenovoideapad720S-13ARR:rvnLENOVO:rnLNVNB161216:rvrSDK0L77769WIN:cvnLENOVO:ct10:cvrLenovoideapad720S-13ARR: ideapad 720S-13ARR 81BR
dmi.product.version: Lenovo ideapad 720S-13ARR
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.85-4~a~padoka0
version.libgl1-mesa-dri: libgl1-mesa-dri 1:17.3.2-0~a~padoka0
version.libgl1-mesa-glx: libgl1-mesa-glx 1:17.3.2-0~a~padoka0
version.xserver-xorg-core: xserver-xorg-core 2:1.19.5-0ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.10.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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

** Tags: amd64 apport-bug artful freeze third-party-packages ubuntu

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  Xorg freeze when use mpv or cheese.

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