Ubuntu_fixes_for_lenovo_legion_5i-15 R7 32GB RAM 512GB RTX2060.md

This is a collection of Ubuntu fixes for Lenovo Legion 5i

Tested on: Lenovo Legion 5i with below specs:
AMD® Ryzen 7 4800h with radeon graphics × 16
NVIDIA Corporation / NVIDIA GeForce RTX 2060/PCIe/SSE2

1. GPU ISSUES for RTX 2060:

nvidia-driver-470 - HDMI doesn't have to work from the beggining
nvidia-driver-495 - HDMI works from the beginning, unstable (random reboots)
recommended way to install nvidia drivers:
sudo ubuntu-drivers autoinstall

1.1 How to fix external display (HDMI) - no signal

sudo prime-select nvidia
reboot

1.2 How to fix brightness control

sudo nano /etc/default/grub

1.2.1 BIOS in switchable mode:

Add video.use_native_backlight=1 to GRUB_CMDLINE_LINUX_DEFAULT like below:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video.use_native_backlight=1"

sudo update-grub2
reboot

1.2.2 BIOS in descrete mode:

Replace content of GRUB_CMDLINE_LINUX_DEFAULT with nvidia-drm.modeset=1 acpi_backlight=native nvidia.NVreg_RegistryDwords=EnableBrightnessControl=1, like below:

GRUB_CMDLINE_LINUX="nvidia-drm.modeset=1 acpi_backlight=native nvidia.NVreg_RegistryDwords=EnableBrightnessControl=1"

sudo update-grub2
reboot

1.3 Fix backlight error logs during boot

Example: systemd-backlight[897]: Failed to get backlight or LED device 'backlight:acpi_video1': No such device Edit service file: sudo nano /lib/systemd/system/systemd-backlight@.service Replace content with:

[Unit]
Description=Set lower brightness on startup
After=systemd-backlight@backlight:amdgpu_bl0.service

[Service]
Type=oneshot
ExecStart=/bin/bash -c 'echo 25 > /sys/class/backlight/amdgpu_bl0/brightness'
ExecStart=systemctl start --now systemd-backlight@backlight:amdgpu_bl0

[Install]
WantedBy=systemd-backlight@backlight:amdgpu_bl0.service
WantedBy=multi-user.target

1.4 Fix amdgpu: Unsupported power profile mode 0

to-do (I don't know how to fix it currently, but doesn't look critical)

2. BIOS oriented issues:

2.1 Fix "Integrity: problem loading X.509 certificate -65"

1. Go to bios during boot by pressing F2
2: Disable the Secure Boot in bios
3: Reset Setup Mode ( this function is in Bios )
4: Launch Ubuntu
5: Enable the Secure Boot in bios

Sources:
https://askubuntu.com/a/1378613 (author: Pierre)
https://forums.developer.nvidia.com/t/ubuntu-doesnt-detect-my-second-hdmi-display/75076/62?page=4
https://www.linux.org/threads/failed-to-start-load-save-screen-backlight-brightness-of-amdgpu_bl1.31998/
https://itectec.com/ubuntu/ubuntu-integrity-problem-loading-x-509-certificate-65-before-login/