Enable serial console on Ubuntu 20.04.4

05-etc-default-grub-boot-logging.diff

--- /etc/default/grub.ORIG	2024-08-09 15:11:45.702836000 +0300
+++ /etc/default/grub	2024-08-09 15:35:29.980627000 +0300
@@ -4,11 +4,16 @@
 #   info -f grub -n 'Simple configuration'
 
 GRUB_DEFAULT=0
-GRUB_TIMEOUT_STYLE=hidden
-GRUB_TIMEOUT=0
+#GRUB_TIMEOUT_STYLE=hidden
+ GRUB_TIMEOUT_STYLE=menu
+#GRUB_TIMEOUT=0
+ GRUB_TIMEOUT=3
 GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
-GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
-GRUB_CMDLINE_LINUX=""
+#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
+ GRUB_CMDLINE_LINUX_DEFAULT=""
+#GRUB_CMDLINE_LINUX=""
+ GRUB_CMDLINE_LINUX="console=tty1 console=ttyS0,115200"
+# 2024-08-09 saukrs: Kernel logai GPU permetimui debuginti.
 
 # Uncomment to enable BadRAM filtering, modify to suit your needs
 # This works with Linux (no patch required) and with any kernel that obtains
@@ -17,6 +22,8 @@
 
 # Uncomment to disable graphical terminal (grub-pc only)
 #GRUB_TERMINAL=console
+ GRUB_TERMINAL="console serial"
+ GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"
 
 # The resolution used on graphical terminal
 # note that you can use only modes which your graphic card supports via VBE

06-proxmox-109-bootlog.sh

sudo qm show 109 | sed 's/ -/ \\\n -/g' | tee 07-start-109.sh
nano 07-start-109.sh

# Jeigu viskas gražu, startuojam:

chmod +x 07-start-109.sh
sudo 07-start-109.sh

08-host-memory-info.log

saukrs@omn:~$ grep Mem /proc/meminfo
MemTotal:       65182216 kB
MemFree:        33490976 kB
MemAvailable:   33196840 kB

09-guest-VGA-info.log

saukrs@ugui:~$ grep . /sys/bus/pci/drivers/*/*/boot_vga
/sys/bus/pci/drivers/bochs-drm/0000:00:01.0/boot_vga:1
/sys/bus/pci/drivers/nvidia/0000:01:00.0/boot_vga:0

saukrs@ugui:~$ lspci -nnv | awk '/\[03.+(NVIDIA|1234:1111)/ {PRINT=1} /^0|Kernel/ && PRINT; /^$/ {PRINT=0}'
00:01.0 VGA compatible controller [0300]: Device [1234:1111] (rev 02) (prog-if 00 [VGA controller])
        Kernel driver in use: bochs-drm
        Kernel modules: bochs
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GP108 [GeForce GT 1030] [10de:1d01] (rev a1) (prog-if 00 [VGA controller])
        Kernel driver in use: nvidia
        Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia

saukrs@ugui:~$ ubuntu-drivers devices
== /sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0 ==
modalias : pci:v000010DEd00001D01sv00001043sd00008621bc03sc00i00
vendor   : NVIDIA Corporation
model    : GP108 [GeForce GT 1030]
driver   : nvidia-driver-470-server - distro non-free
driver   : nvidia-driver-535 - distro non-free recommended
driver   : nvidia-driver-450-server - distro non-free
driver   : nvidia-driver-470 - distro non-free
driver   : nvidia-driver-390 - distro non-free
driver   : nvidia-driver-545 - distro non-free
driver   : nvidia-driver-418-server - distro non-free
driver   : nvidia-driver-535-server - distro non-free
driver   : xserver-xorg-video-nouveau - distro free builtin

asciinema-recording.url

https://asciinema.org/a/U1SIszeCEPMR4m94fXuURPUC3