I just did a fresh install of Ubuntu 20.04 on my dell xps9365 with intel HD615 graphics & 4k display
1. First boot:
In the Settings > About I can see that it is using the Mesa Intel HD Graphics 615 (KBL GT2)
At this point i also have a slider to adjust my brightness.
2. First REboot:
At the first reboot its not working anymore.
It keeps hanging at splash screen. So i did some searching and added nomodeset to my grub file before booting.
It Boots up! But now i don't have my brightness slider and i see it is using the llvmpipe drivers instead of the Mesa Intel HD Graphics 615 (KBL GT2).
I tried to change GRUB_CMDLINE_LINUX_DEFAULT to different variants:
quiet splash nomodeset video.use_native_backlight=1
quiet splash nomodeset acpi_backlight=video
quiet splash nomodeset acpi_backlight=vendor
quiet splash nomodeset acpi_backlight=native
nomodeset video.use_native_backlight=1
nomodeset acpi_backlight=video
nomodeset acpi_backlight=vendor
nomodeset acpi_backlight=native
But all give the same result: llvmpipe drivers and no brightness control.
When i was reading trough some post this is what i learned also: nomodeset disabled the drivers during boot, so you don't have a fancy splash screen. Once the machine is booted it would load the proper drivers. But for some reason it doesn't seem to be working for me.
Can someone please help?
