https://bugzilla.kernel.org/show_bug.cgi?id=216954
--- Comment #1 from Bogdan (bogdan.pylypenko...@gmail.com) --- Syslog messages are generated in any case, regardless of the availability of the backlight device: both in 6.1.3 and at 6.1.5+. But backlight level is changed only if backlight device is present in the system (6.1.3). Backlight level stay at 100% (maximum), if backlight device dows not found in system (6.1.5 and above). At 100% level of backlight, the eyes are damaged by high intensity of the led light. I do not test the kernel 6.1.4. I think that the backlighting device was not found in my system, and the link at /sys/devices/pci0000:00/0000:00:08.1/0000:05:00.0/backlight path was not created using this function added to the kernel 6.1.4 or 6.1.5: For kernel 6.1.4: > $ curl -s https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.4 | grep > -i -B 8 -A 6 backlight | grep -A 5 ^commit >commit 8af3d02aae3ecc23ee84d7078d1ebb3df7557dda >Author: Hans de Goede <hdego...@redhat.com> >Date: Mon Nov 14 15:44:59 2022 +0100 > > ACPI: video: Prefer native over vendor > >-- >commit 923c1922bdbe44bdbebe57b5b976d40f68853653 >Author: Hans de Goede <hdego...@redhat.com> >Date: Mon Nov 14 15:44:58 2022 +0100 > > ACPI: video: Simplify __acpi_video_get_backlight_type() For kernel 6.1.5: > $ curl -s https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.5 | grep > -i -B 8 -A 7 backlight | grep -A 5 ^commit >commit 9c152189a7e85dac1f759d6ba95f877af91ccf8c >Author: Mario Limonciello <mario.limoncie...@amd.com> >Date: Thu Dec 8 10:42:07 2022 -0600 > > ACPI: video: Don't enable fallback path for creating ACPI backlight by > default > >-- >commit adaf41b56803fe7a9a4ac625c7e41615ef23591f >Author: Mario Limonciello <mario.limoncie...@amd.com> >Date: Thu Dec 8 10:42:06 2022 -0600 > > drm/amd/display: Report to ACPI video if no panels were found > >-- >commit 0ba8892d86ad69775e4ee3de53b021ae33aca8c0 >Author: Mario Limonciello <mario.limoncie...@amd.com> >Date: Thu Dec 8 10:42:05 2022 -0600 > > ACPI: video: Allow GPU drivers to report no panels -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug. _______________________________________________ acpi-bugzilla mailing list acpi-bugzilla@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/acpi-bugzilla
