[Bug 1712508] Re: Disappearing screen and flickering after upgrade to 16.04

[gdm85]

I confirm this bug is present on Ubuntu 18.04, my hardware is an Intel
HD Graphics 5500.

It was working fine on the previous LTS, 16.04; if I use kernel
4.4.0-161-generic from Ubuntu 16 Xenial I can boot Ubuntu 18 Bionic
fine, thus I conclude it's something in the kernel.

I have tried these options (individually) without any effect:
i915.enable_ips=0 swiotlb=force i915.enable_ips=0
intel_idle.max_cstate=1 i915.enable_rc6=0 i915.enable_psr=0

On the good kernel I see this error in dmesg:
[drm:intel_dp_link_training_channel_equalization [i915]] *ERROR* failed to 
train DP, aborting

While on the bad one there are no such failures as it detects everything:
[   10.429894] input: HDA Intel HDMI HDMI/DP,pcm=3 as 
/devices/pci:00/:00:03.0/sound/card0/input22
[   10.429989] input: HDA Intel HDMI HDMI/DP,pcm=7 as 
/devices/pci:00/:00:03.0/sound/card0/input23
[   10.430070] input: HDA Intel HDMI HDMI/DP,pcm=8 as 
/devices/pci:00/:00:03.0/sound/card0/input24
[   10.430166] input: HDA Intel HDMI HDMI/DP,pcm=9 as 
/devices/pci:00/:00:03.0/sound/card0/input25
[   10.430250] input: HDA Intel HDMI HDMI/DP,pcm=10 as 
/devices/pci:00/:00:03.0/sound/card0/input26

The most interesting clue to find a solution is however to be found in
gparted-live-1.0.0-5-amd64.iso: when booting this live distro via USB I
get exactly the same flickering (it uses kernel 5.2.0) but when starting
Xorg the problem disappears. Switching back to any VT shows the
flickering problem.

I was wondering if it could be possible to dissect the GParted live ISO
to find out what makes it work when starting Xorg.

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Title:
  Disappearing screen and flickering after upgrade to 16.04

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[Bug 908387] Re: Module aesni_intel not being loaded before mounting LVM2 stacked on LUKS

[gdm85]

@t-devin and that was 2014. Bug is still present in 2018.

Additionally to the mentioned modules cryptd, aes_x86_64 and
aesni_intel, I had to add the dm_crypt module.

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Title:
  Module aesni_intel not being loaded before mounting LVM2 stacked on
  LUKS

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[Bug 1364630] Re: init: Error while reading from descriptor: Broken pipe

[gdm85]

How to reproduce this:

1) go to /etc/init.d
2) rename mountall.sh to disabled-mountall.sh

So perhaps a broken symlink in the /etc/rc* levels causes this?

Should be fairly easy to verify for the people affected.

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Title:
  init: Error while reading from descriptor: Broken pipe

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