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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2095291 Title: kernel Patch to Fix Low and Inverted Brightness Value on AMD Devices To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2095291/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
