X fails to start, TTY only, deleting conf solves issue

Summary

This issue certainly seems like a duplicate of other issues. I am raising it here as a separate issue with more detail on this system. See #746 , #747 , and possibly #781 . Since the issue still persists and my logs have more information than some of the others, this may be useful.

Hardware

neofetch --off
wes-TITAN
------------- 
OS: Kubuntu 22.10 x86_64 
Host: TITAN Standard 
Kernel: 5.19.0-29-generic 
Uptime: 4 mins 
Packages: 2175 (dpkg), 7 (snap) 
Shell: bash 5.2.2 
Resolution: 2560x1440 
DE: Plasma 5.25.5 
WM: KWin 
Theme: [Plasma], Breeze [GTK2/3] 
Icons: [Plasma], breeze-dark [GTK2/3] 
Terminal: konsole 
CPU: AMD Ryzen 9 5900HX with Radeon Graphics (16) @ 4.680GHz 
GPU: NVIDIA GeForce RTX 3070 Mobile / Max-Q 
GPU: AMD ATI 06:00.0 Cezanne 
Memory: 3147MiB / 31499MiB

Attempting to use a new i-tec CADUA4KDOCKPDLUS dock with 2 extra 4K monitors through the USB-C port on the computer with DisplayPort cables to the dock.

Steps I've Taken

I installed the drivers on a 100% fresh install of Kubuntu 22.10. Log below.

$ sudo ./displaylink-debian.sh

--------------------------- displaylink-debian -------------------------------

DisplayLink driver installer for Debian and Ubuntu based Linux distributions:

* Debian, Ubuntu, Elementary OS, Mint, Kali, Deepin and many more!
* Full list of all supported platforms: http://bit.ly/2zrwz2u
* When submitting a new issue, include Debug information

Options:

[I]nstall
[D]ebug
[R]e-install
[U]ninstall
[Q]uit

Select a key: [i/d/r/u/q]: i

-------------------------------------------------------------------

Checking dependencies

unzip is installed
linux-headers-5.19.0-29-generic is installed
dpkg-query: package 'dkms' is not installed and no information is available
Use dpkg --info (= dpkg-deb --info) to examine archive files.
dkms not found! Install? [Y/n] y
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
  build-essential dctrl-tools dh-dkms dpkg-dev fakeroot g++ g++-12 gcc gcc-12
  libalgorithm-diff-perl libalgorithm-diff-xs-perl libalgorithm-merge-perl libasan8
  libatomic1 libc-dev-bin libc-devtools libc6-dev libcc1-0 libcrypt-dev libfakeroot
  libgcc-12-dev libitm1 liblsan0 libnsl-dev libstdc++-12-dev libtirpc-dev libtsan2
  libubsan1 linux-libc-dev lto-disabled-list make manpages-dev rpcsvc-proto
Suggested packages:
  debtags menu debian-keyring g++-multilib g++-12-multilib gcc-12-doc gcc-multilib
  autoconf automake libtool flex bison gcc-doc gcc-12-multilib gcc-12-locales glibc-doc
  libstdc++-12-doc make-doc
The following NEW packages will be installed:
  build-essential dctrl-tools dh-dkms dkms dpkg-dev fakeroot g++ g++-12 gcc gcc-12
  libalgorithm-diff-perl libalgorithm-diff-xs-perl libalgorithm-merge-perl libasan8
  libatomic1 libc-dev-bin libc-devtools libc6-dev libcc1-0 libcrypt-dev libfakeroot
  libgcc-12-dev libitm1 liblsan0 libnsl-dev libstdc++-12-dev libtirpc-dev libtsan2
  libubsan1 linux-libc-dev lto-disabled-list make manpages-dev rpcsvc-proto
0 upgraded, 34 newly installed, 0 to remove and 87 not upgraded.
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Get:34 http://us.archive.ubuntu.com/ubuntu kinetic/main amd64 manpages-dev all 5.13-1 [2,355 kB]
Fetched 52.9 MB in 9s (5,749 kB/s)
debconf: unable to initialize frontend: Dialog
debconf: (Dialog frontend requires a screen at least 13 lines tall and 31 columns wide.)
debconf: falling back to frontend: Readline
Extracting templates from packages: 100%
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lsb-release is installed
dpkg-query: package 'linux-source' is not installed and no information is available
Use dpkg --info (= dpkg-deb --info) to examine archive files.
linux-source not found! Install? [Y/n] y
Reading package lists... Done
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Reading state information... Done
The following additional packages will be installed:
  linux-source-5.19.0
Suggested packages:
  libncurses-dev | ncurses-dev kernel-package libqt3-dev
The following NEW packages will be installed:
  linux-source linux-source-5.19.0
0 upgraded, 2 newly installed, 0 to remove and 87 not upgraded.
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x11-xserver-utils is installed
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libdrm-dev not found! Install? [Y/n] y
Reading package lists... Done
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The following additional packages will be installed:
  libpciaccess-dev
The following NEW packages will be installed:
  libdrm-dev libpciaccess-dev
0 upgraded, 2 newly installed, 0 to remove and 87 not upgraded.
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  zlib1g-dev
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  libelf-dev zlib1g-dev
0 upgraded, 2 newly installed, 0 to remove and 87 not upgraded.
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git is installed
pciutils is installed

Platform requirements satisfied, proceeding ...

-------------------------------------------------------------------

Please read the Software License Agreement available at:
https://www.synaptics.com/node/4781?filetype=exe
Do you accept?: [Y/n]: y

Downloading DisplayLink Ubuntu driver:

--2023-01-26 10:45:08--  https://www.synaptics.com/sites/default/files/exe_files/2022-08/DisplayLink%20USB%20Graphics%20Software%20for%20Ubuntu5.6.1-EXE.zip
Resolving www.synaptics.com (www.synaptics.com)... 54.245.106.105
Connecting to www.synaptics.com (www.synaptics.com)|54.245.106.105|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 16905857 (16M) [application/zip]
Saving to: ‘DisplayLink_Ubuntu_5.6.1.zip’

DisplayLink_Ubuntu_5.6.1.zip           100%[===========================================================================>]  16.12M  2.84MB/s    in 5.7s

2023-01-26 10:45:14 (2.82 MB/s) - ‘DisplayLink_Ubuntu_5.6.1.zip’ saved [16905857/16905857]

-------------------------------------------------------------------

Preparing for install

Archive:  DisplayLink_Ubuntu_5.6.1.zip
  inflating: 5.6.1/displaylink-driver-5.6.1-59.184.run
  inflating: 5.6.1/DisplayLink USB Graphics Software for Ubuntu 5.6.1-59.185-Release Notes.txt
  inflating: 5.6.1/__MACOSX/._DisplayLink USB Graphics Software for Ubuntu 5.6.1-59.185-Release Notes.txt
Creating directory displaylink-driver-5.6.1-59.184
Verifying archive integrity...  100%   MD5 checksums are OK. All good.
Uncompressing DisplayLink Linux Driver 5.6.1-59.184  100%
patching file 5.6.1/displaylink-driver-5.6.1/displaylink-installer.sh
patch unexpectedly ends in middle of line

Installing driver version: 5.6.1

Distribution discovered: Ubuntu 22.10

Installing
[ Installing EVDI ]
[[ Installing EVDI DKMS module ]]
Sign command: /usr/bin/kmodsign
Certificate or key are missing, generating them using update-secureboot-policy...
Generating a new Secure Boot signing key:
Can't load /var/lib/shim-signed/mok/.rnd into RNG
40D7CDFE947F0000:error:12000079:random number generator:RAND_load_file:Cannot open file:../crypto/rand/randfile.c:106:Filename=/var/lib/shim-signed/mok/.rnd
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.+...+.+............+.....+....+...+...+..+...+....+.....+.+.....+...+......+......+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*.........+...............+...+....+...............+..+...+......+.+...........+...+.+........+.+......+...........+...+....+...+.....+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*...+.+.........+..+...+....+...+..............+...+......+.......+..+...+....+..............+..........+.....+....+...+..............+.............+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-----
Secure Boot not enabled on this system.
Signing key: /var/lib/shim-signed/mok/MOK.priv
Public certificate (MOK): /var/lib/shim-signed/mok/MOK.der
Creating symlink /var/lib/dkms/evdi/1.12.0/source -> /usr/src/evdi-1.12.0

Building module:
Cleaning build area...
make -j16 KERNELRELEASE=5.19.0-29-generic all INCLUDEDIR=/lib/modules/5.19.0-29-generic/build/include KVERSION=5.19.0-29-generic DKMS_BUILD=1...
Signing module /var/lib/dkms/evdi/1.12.0/build/evdi.ko
Cleaning build area...

evdi.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/5.19.0-29-generic/updates/dkms/
depmod...
[[ Installing module configuration files ]]
[[ Installing EVDI library ]]
make: Entering directory '/tmp/tmp.yoFddvqDl0/evdi/library'
cc -I../module -std=gnu99 -fPIC -D_FILE_OFFSET_BITS=64    -c -o evdi_lib.o evdi_lib.c
cc evdi_lib.o -shared -Wl,-soname,libevdi.so.0 -o libevdi.so.1.12.0 -lc -lgcc
cp libevdi.so.1.12.0 libevdi.so
make: Leaving directory '/tmp/tmp.yoFddvqDl0/evdi/library'
[ Installing x64-ubuntu-1604/DisplayLinkManager ]
[ Installing libraries ]
[ Installing firmware packages ]
[ Installing licence file ]
[ Adding udev rule for DisplayLink DL-3xxx/4xxx/5xxx/6xxx devices ]
[ Adding upstart and powermanager sctripts ]

Please read the FAQ
http://support.displaylink.com/knowledgebase/topics/103927-troubleshooting-ubuntu
Adding udlfb to blacklist
Adding udl to blacklist

-------------------------------------------------------------------

Performing post install steps

Enable displaylink-driver service
Created symlink /etc/systemd/system/multi-user.target.wants/displaylink-driver.service → /lib/systemd/system/displaylink-driver.service.
Setup DisplayLink xorg.conf depending on graphics card

Made backup of: /usr/share/sddm/scripts/Xsetup file

Location: /usr/share/sddm/scripts/Xsetup.org.bak
Wrote changes to /usr/share/sddm/scripts/Xsetup
Wrote X11 changes to: /etc/X11/xorg.conf.d/20-displaylink.conf

-------------------------------------------------------------------

Performing clean-up
Removing redundant: "DisplayLink_Ubuntu_5.6.1.zip" file
Removing redundant: "5.6.1" directory

-------------------------------------------------------------------

Install complete, please reboot to apply the changes
After reboot, make sure to consult post-install guide! http://bit.ly/2TbZleK

This creates a file at /etc/X11/xorg.conf.d/20-displaylink.conf which reads:

Section "ServerLayout"
    Identifier "layout"
    Screen 0 "nvidia"
    Inactive "intel"
EndSection

Section "Device"
    Identifier "intel"
    Driver "modesetting"
    Option "AccelMethod" "None"
EndSection

Section "Screen"
    Identifier "intel"
    Device "intel"
EndSection

Section "Device"
    Identifier "nvidia"
    Driver "nvidia"
    Option "ConstrainCursor" "off"
EndSection

Section "Screen"
    Identifier "nvidia"
    Device "nvidia"
    Option "AllowEmptyInitialConfiguration" "on"
    Option "IgnoreDisplayDevices" "CRT"
EndSection

When I follow the reboot instruction in the code, I fail to start X.

Observation

I fail to load X or even log in to Plasma when I boot. Reading the dmesg, I see:

Jan 26 10:47:01 wes-TITAN sddm[1302]: Failed to read display number from pipe
Jan 26 10:47:01 wes-TITAN sddm[1302]: Could not start Display server on vt 1

Aka, we don't find any displays on this laptop (regardless of connection to dock).

In TTY2, I confirm this with

$ xrandr --listproviders

which finds nothing.

Other notes that show up in Issues

./displaylink-debian.sh --debug gives exit status 1 since it relies on xrandr.
There is no UEFI secure boot on this system.
This repo was suggested by the manufacturer of the dock.

Hotfix

Per buried suggestions in other issues, especially https://github.com/AdnanHodzic/displaylink-debian/issues/747#issuecomment-1246344139, I delete the X config

sudo mv /etc/X11/xorg.config.d//20-displaylink.conf /etc/X11/xorg.config.d//20-displaylink.conf.bak

Upon restart, I get my GUI back.

I also tried two variants of this to no avail. The contents of each variant read:

Var 1 - Reorder Config

Section "ServerLayout"
    Identifier "layout"
    Screen 0 "nvidia"
    Inactive "intel"
EndSection

Section "Device"
    Identifier "nvidia"
    Driver "nvidia"
    Option "ConstrainCursor" "off"
EndSection

Section "Screen"
    Identifier "nvidia"
    Device "nvidia"
    Option "AllowEmptyInitialConfiguration" "on"
    Option "IgnoreDisplayDevices" "CRT"
EndSection

Section "Device"
    Identifier "intel"
    Driver "modesetting"
    Option "AccelMethod" "None"
EndSection

Section "Screen"
    Identifier "intel"
    Device "intel"
EndSection

Var 2 - Remove Intel

Section "ServerLayout"
    Identifier "layout"
    Screen 0 "nvidia"
    Inactive "intel"
EndSection

Section "Device"
    Identifier "nvidia"
    Driver "nvidia"
    Option "ConstrainCursor" "off"
EndSection

Section "Screen"
    Identifier "nvidia"
    Device "nvidia"
    Option "AllowEmptyInitialConfiguration" "on"
    Option "IgnoreDisplayDevices" "CRT"
EndSection

AdnanHodzic / displaylink-debian