Bug 217683

Summary:	Brightness can only be changed once on some HP laptops
Product:	ACPI	Reporter:	Kai-Heng Feng (kai.heng.feng)
Component:	Power-Video	Assignee:	acpi_power-video
Status:	NEW ---
Severity:	normal
Priority:	P3
Hardware:	All
OS:	Linux
Kernel Version:		Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	dmesg acpidump

Description Kai-Heng Feng 2023-07-19 02:14:54 UTC

Because ACPI video's child devices aren't put to D0 at boot, and the panel brightness on those devices requires _PS0 being evaluated to work properly.

Comment 1 Kai-Heng Feng 2023-07-19 02:15:19 UTC

Created attachment 304659 [details]
dmesg

Comment 2 Kai-Heng Feng 2023-07-19 02:15:41 UTC

Created attachment 304660 [details]
acpidump