Hello,

Very similar situation here with an ASRock N3150M motherboard. This board has 
DVI, HDMI and VGA ports, of which I'm using just the DVI. The Xubuntu 18.04 
Bionic Beaver i386 DVD fails to bring up the window manager with a GPU hang.
What works: nomodeset
What doesn't: bootstring intel_iommu=off (a solution proposed elsewhere)

When nomodeset is NOT used, nine times out of ten a single underscore
character appears at the top left of the screen and the kernel is
unresponsive (Alt-SysRq-h does nothing), however it is occasionally
possible to get a mouse pointer on a blank screen and switch to console
from there.

I was able to retrieve /sys/class/drm/card0/error and will attach.
Also some related info from logs, please see below.

Regards.

======================================

from dpkg.log
-------------
linux-image-4.15.0-20-generic:i386 4.15.0-20.21
libx11-6:i386 2:1.6.4-3
xserver-xorg:i386 1:7.7+19ubuntu7
xserver-xorg-core:i386 2:1.19.6-1ubuntu4
xserver-xorg-video-vesa:i386 1:2.3.4-1build3
xserver-xorg-video-intel:i386 2:2.99.917+git20171229-1
i965-va-driver:i386 2.1.0-0ubuntu1
libgl1-mesa-glx:i386 18.0.0~rc5-1ubuntu1
libdrm2:i386 2.4.91-2
libwayland-server0:i386 1.14.0-2
lightdm:i386 1.26.0-0ubuntu1
lightdm-gtk-greeter:i386 2.0.5-0ubuntu1


from lspci -vnn
---------------
00:02.0 VGA compatible controller [0300]: Intel Corporation 
Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Integrated Graphics 
Controller [8086:22b1] (rev 21) (prog-if 00 [VGA controller])
        Subsystem: ASRock Incorporation Atom/Celeron/Pentium Processor 
x5-E8000/J3xxx/N3xxx Integrated Graphics Controller [1849:22b1]
        Flags: bus master, fast devsel, latency 0, IRQ 120
        Memory at 90000000 (64-bit, non-prefetchable) [size=16M]
        Memory at 80000000 (64-bit, prefetchable) [size=256M]
        I/O ports at f000 [size=64]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: i915
        Kernel modules: i915


from lshw
---------
        *-display
             description: VGA compatible controller
             product: Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx 
Integrated Graphics Controller
             vendor: Intel Corporation
             physical id: 2
             bus info: pci@0000:00:02.0
             version: 21
             width: 64 bits
             clock: 33MHz
             capabilities: pm msi vga_controller bus_master cap_list rom
             configuration: driver=i915 latency=0
             resources: irq:120 memory:90000000-90ffffff 
memory:80000000-8fffffff ioport:f000(size=64) memory:c0000-dffff


from dmesg
----------
[    0.000000] Linux version 4.15.0-20-generic (buildd@lgw01-amd64-033) (gcc 
version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #21-Ubuntu SMP Tue Apr 24 06:15:38 UTC 
2018 (Ubuntu 4.15.0-20.21-generic 4.15.17)
[    0.000000] ACPI BIOS Warning (bug): 32/64X length mismatch in 
FADT/Gpe0Block: 128/32 (20170831/tbfadt-603)
[    0.140275] pci 0000:00:02.0: vgaarb: setting as boot VGA device
[    0.140275] pci 0000:00:02.0: vgaarb: VGA device added: 
decodes=io+mem,owns=io+mem,locks=none
[    0.140321] pci 0000:00:02.0: vgaarb: bridge control possible
[    0.140417] vgaarb: loaded
[   16.996226] [drm] Memory usable by graphics device = 2048M
[   16.996329] [drm] Replacing VGA console driver
[   16.997434] Console: switching to colour dummy device 80x25
[   16.997628] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[   16.997636] [drm] Driver supports precise vblank timestamp query.
[   17.013439] i915 0000:00:02.0: vgaarb: changed VGA decodes: 
olddecodes=io+mem,decodes=io+mem:owns=io+mem
[   17.041642] [drm] Initialized i915 1.6.0 20171023 for 0000:00:02.0 on minor 0
[   17.043448] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)
[   17.043986] input: Video Bus as 
/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input6
[   17.761317] fbcon: inteldrmfb (fb0) is primary device
[   17.855096] Console: switching to colour frame buffer device 160x64
[   17.881119] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[   77.850052] pwm-lpss 80862288:00: invalid resource
[   77.854135] pwm-lpss: probe of 80862288:00 failed with error -22
[  302.985906] [drm] GPU HANG: ecode 8:0:0x00113131, in Xorg [1745], reason: 
Hang on rcs0, action: reset
[  302.985921] i915 0000:00:02.0: Resetting rcs0 after gpu hang
[  311.004456] i915 0000:00:02.0: Resetting rcs0 after gpu hang
[  318.972141] i915 0000:00:02.0: Resetting rcs0 after gpu hang
[  327.004474] i915 0000:00:02.0: Resetting rcs0 after gpu hang
[  336.988480] i915 0000:00:02.0: Resetting rcs0 after gpu hang
[  355.964607] i915 0000:00:02.0: Resetting rcs0 after gpu hang


from x-0.log
------------
X.Org X Server 1.19.6
Release Date: 2017-12-20
X Protocol Version 11, Revision 0
Build Operating System: Linux 4.4.0-119-generic i686 Ubuntu
Current Operating System: Linux xubuntu 4.15.0-20-generic #21-Ubuntu SMP Tue 
Apr 24 06:15:38 UTC 2018 i686
Kernel command line: file=/cdrom/preseed/xubuntu.seed boot=casper 
initrd=/casper/initrd.lz  ---  keyboard-configuration/layoutcode=jp 
keyboard-configuration/modelcode=jp106
Build Date: 13 April 2018  08:08:02PM
xorg-server 2:1.19.6-1ubuntu4 (For technical support please see 
http://www.ubuntu.com/support) 
Current version of pixman: 0.34.0
(II) AIGLX: Suspending AIGLX clients for VT switch
i965: Failed to submit batchbuffer: Input/output error


from seat0-greeter.log
----------------------
(lightdm-gtk-greeter:2369): WARNING **: [PIDs] Failed to execute command: 
upstart
(lightdm-gtk-greeter:2369): Gtk-WARNING **: Drawing a gadget with negative 
dimensions. Did you forget to allocate a size? (node menubar owner 
GreeterMenuBar)

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1767993

Title:
  Lubuntu: X11 freezing/low resolution on N3150 intel graphics

Status in xorg-server package in Ubuntu:
  Confirmed

Bug description:
  Hi,
  I just installed a fresh 18.04 on an ASRock beebox N3150 machine.

  The regular ubuntu desktop installer hanged after entering X11 mode,
  machine froze.

  I then used Lubuntu alternate installer with the console based
  installation, which worked without any problem.

  But after rebooting the system again hung after the graphical login
  prompt.

  I then changed the boot options in /etc/default/grub to give the
  kernel the options nosplash nomodeset and to leave the system in
  console mode (I had similar experiences with former ubuntu versions on
  that machine where X11 did not start when the mode had been set by
  console.)

  
  Now X11 works, but comes up in vesa mode (1024x768) only.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xserver-xorg-core 2:1.19.6-1ubuntu4
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  CurrentDesktop: LXDE
  Date: Mon Apr 30 12:25:09 2018
  InstallationDate: Installed on 2018-04-30 (0 days ago)
  InstallationMedia: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 
(20180426)
  SourcePackage: xorg-server
  UpgradeStatus: No upgrade log present (probably fresh install)

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