[Bug 1821609] [NEW] Xorg freeze - fails to start or stay going screen blanks-grub seems involved

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Okay the has happened recently at least since march 18, 2019 iso and
march 22, 2019 iso are both effected very similar to one of my
previously reported bugs .. which was related to xorg not being
installed ..


back ground .. PC is lenovo sl 500 with evo860 SSD drive

3 partions contain installs of disco sda1 -- main working system -- I
usually install grub from here as master ..

sda6 and sda7 are test installs of disco daily iso's 03-18-2019,
03-22-2019 repectively


on the test installs as long as the iso is using the grub boot loader installed from that install the system will boot normally .. the display manger tends to flicker on and off but does final start and login can proceed. 

but if another install re-installs grub as master  the display manager
fails to stay active or even come-up  for sda6 or sda7 only if their own
grubs are reinstalled will they work normally

sda1 display manager/xorg login works always no matter which "grub-
source" is in control.

if I use rescue boot from any grub as master I can get the displays to work by running dpkg fix which does nothing .. and then resuming the boot .. then things work normally..
if the "non-rescue" boots are used the screen/computer locks and only a power down and reboot gives access. (sometime requiring radical depowering .. unpluging and removing battery)

now the is a message that appears that RCs??? level is missing.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: xorg 1:7.7+19ubuntu11
ProcVersionSignature: Ubuntu 5.0.0-7.8-generic 5.0.0
Uname: Linux 5.0.0-7-generic x86_64
ApportVersion: 2.20.10-0ubuntu23
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: XFCE
Date: Mon Mar 25 11:25:58 2019
DistUpgraded: Fresh install
DistroCodename: disco
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GpuHangFrequency: Several times a day
GpuHangReproducibility: Yes, I can easily reproduce it
GpuHangStarted: Immediately after installing this version of Ubuntu
GraphicsCard:
 Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Mobile 4 Series Chipset Integrated Graphics Controller [17aa:20e4]
   Subsystem: Lenovo Mobile 4 Series Chipset Integrated Graphics Controller [17aa:20e4]
InstallationDate: Installed on 2019-03-23 (1 days ago)
InstallationMedia: Xubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190322)
MachineType: LENOVO 2746CTO
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-7-generic root=UUID=1d61086d-275b-4537-bed5-f2d3080670eb ro recovery nomodeset
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/01/2010
dmi.bios.vendor: LENOVO
dmi.bios.version: 6AET64WW
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: 2746CTO
dmi.board.vendor: LENOVO
dmi.board.version: LENOVO 6AET64WW
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: LENOVO 6AET64WW
dmi.modalias: dmi:bvnLENOVO:bvr6AET64WW:bd12/01/2010:svnLENOVO:pn2746CTO:pvrThinkPadSL500:rvnLENOVO:rn2746CTO:rvrLENOVO6AET64WW:cvnLENOVO:ct10:cvrLENOVO6AET64WW:
dmi.product.name: 2746CTO
dmi.product.version: ThinkPad SL500
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.97-1
version.libgl1-mesa-dri: libgl1-mesa-dri 19.0.0-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.4-1ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

** Affects: kwallet-pam (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug disco freeze has-workaround regression reproducible ubuntu
-- 
Xorg freeze - fails to start or stay going screen blanks-grub  seems involved
https://bugs.launchpad.net/bugs/1821609
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