Upgrade 18.10->19.04, fail to boot

[Lucy Archer]

I was using kernel 4.19.20 with ubuntu 18.10 and it was working fine. Upgraded to 19.04 and it now boots approximately one attempt every 5. Doesn't depend on the kernel I choose (I have both 4.19.20 and 5.0.0 installed).

If I use the default Ubuntu boot entry, I get a black screen (when normally it would prompt for the disk decryption password). If I go to advanced options and choose a kernel (doesn't matter which one or whether it's recovery mode or not) then I get "Loading linux <version> ..." "Loading initial ramdisk ..." then nothing. Ctrl-alt-del doesn't work, power key needs holding for 10s to turn off.

I've followed the steps to get it to print more output (gfxmode text, remove quiet, splash, vt options) but it doesn't give any more debug.

I don't know if the problem is in grub or in the kernel. It's really odd that it works sometimes - I haven't spotted a pattern to that yet.

I've attached a video of the boot process (I'd added an extra line to the grub script to make it print "Booting..." after loading the initial ramdisk, but that doesn't make a difference to whether it works or not). Sorry about the focus - phone cameras don't like big blank spaces.

Happy to try more debug options, but have limited time so might not be quick to respond. Asus Zenbook 14, in case that makes a difference.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: xorg 1:7.7+19ubuntu12
ProcVersionSignature: Ubuntu 5.0.0-13.14-generic 5.0.6
Uname: Linux 5.0.0-13-generic x86_64
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: KDE
Date: Sat May 4 08:58:16 2019
DistUpgraded: 2019-04-30 08:01:15,799 DEBUG Running PostInstallScript: './xorg_fix_proprietary.py'
DistroCodename: disco
DistroVariant: ubuntu
ExtraDebuggingInterest: No
GraphicsCard:
 Intel Corporation UHD Graphics 620 (Whiskey Lake) [8086:3ea0] (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. UHD Graphics 620 (Whiskey Lake) [1043:1461]
InstallationDate: Installed on 2019-02-01 (91 days ago)
InstallationMedia: Kubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.2)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 002: ID 13d3:56cb IMC Networks
 Bus 001 Device 003: ID 8087:0aaa Intel Corp.
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: ASUSTeK COMPUTER INC. ZenBook UX433FA_UX433FA
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.0.0-13-generic root=/dev/mapper/vgvriska-lvvriskaroot ro quiet splash
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to disco on 2019-04-30 (4 days ago)
dmi.bios.date: 11/21/2018
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: UX433FA.301
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: UX433FA
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX433FA.301:bd11/21/2018:svnASUSTeKCOMPUTERINC.:pnZenBookUX433FA_UX433FA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX433FA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.family: ZenBook
dmi.product.name: ZenBook UX433FA_UX433FA
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.97-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 19.0.2-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 19.0.2-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.20.4-1ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.1-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20180925-2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

[Lucy Archer (elyarna)]

Don't know how xorg got selected - pretty sure the problem is with grub or with the kernel, and seeing as the 4.19.20 kernel used to work, I'm guessing it's grub

[Lucy Archer (elyarna)]

This bug is still showing with kernel 5.0.0-15 (was 5.0.0-13 before)

Any news on this/debug I can do/things I can try? It's been a month and it looks like this bug has fallen off the radar, but it's still causing issues here.

[Lucy Archer (elyarna)]

Update: upgrading BIOS from 301 to 304 fixed this. Problem may still occur on other machines but on my Zenbook 14 it's fixed.