Bug 2383526

Summary:	drm/amd/display: fix initial backlight brightness calculation
Product:	[Fedora] Fedora	Reporter:	Philbert Desanex <j_doe>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	NEW ---	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	42	CC:	acaringi, adscvr, airlied, hdegoede, hpa, josef, kernel-maint, linville, masami256, mchehab, ptalbert, steved, suraj.ghimire7
Target Milestone:	---	Keywords:	Regression
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Philbert Desanex 2025-07-25 16:44:13 UTC

The backlight calculation for systems with AMD GPU has a bug that leads to a very dim screen during boot-up, with special impact on the ability to enter the password for LUKS encrypted drives.

My system:
 AMD Ryzen™ AI 9 HX 370 w/ Radeon™ 890M × 24
 Fedora 42
 Kernel 6.15.7-200.fc42.x86_64

This has been fixed here: https://lore.kernel.org/amd-gfx/aH2Q_HJvxKbW74vU@hacktheplanet.fi/

Would it be possible to include this patch with 6.16?

Reproducible: Always

More context: https://community.frame.work/t/screen-dimming-setting-in-bios/72024