[Bug 2095291] [NEW] kernel Patch to Fix Low and Inverted Brightness Value on AMD Devices

Public bug reported:

I have a problem on Linux with my "AMD Ryzen 5 5600H with Radeon Graphics" which is brightness is so low & brightness controls inverted. An important detail is the backlight is at max brightness during the grub screen and halfway into the boot process, just around the time when the systemd backlight service is invoked the screen dims all the way down and stays that way.
In my laptop, the LCD panel is connected to the AMD GPU.

Description: Ubuntu 24.04.1 LTS
Release: 24.04
Kernel: 6.8.0-51-generic

The problem is fixed in this gitlab issue and in mainline kernel 6.11.3
Gitlabs Issues is solved by Mario Limonciello: https://gitlab.freedesktop.org/drm/amd/-/issues/3020#note_2568083

Patch for the fix is given in the attachment file

** Affects: linux (Ubuntu)
Importance: Undecided
Status: New


** Tags: noble patch

** Patch added: "0001-drm-amd-display-Validate-backlight-caps-are-sane.patch"
https://bugs.launchpad.net/bugs/2095291/+attachment/5853006/+files/0001-drm-amd-display-Validate-backlight-caps-are-sane.patch

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https://bugs.launchpad.net/bugs/2095291

Title:
kernel Patch to Fix Low and Inverted Brightness Value on AMD Devices

Status in linux package in Ubuntu:
New

Bug description:
I have a problem on Linux with my "AMD Ryzen 5 5600H with Radeon Graphics" which is brightness is so low & brightness controls inverted. An important detail is the backlight is at max brightness during the grub screen and halfway into the boot process, just around the time when the systemd backlight service is invoked the screen dims all the way down and stays that way.
In my laptop, the LCD panel is connected to the AMD GPU.

Description: Ubuntu 24.04.1 LTS
Release: 24.04
Kernel: 6.8.0-51-generic

The problem is fixed in this gitlab issue and in mainline kernel 6.11.3
Gitlabs Issues is solved by Mario Limonciello: https://gitlab.freedesktop.org/drm/amd/-/issues/3020#note_2568083

Patch for the fix is given in the attachment file

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