Bug 2383526 - drm/amd/display: fix initial backlight brightness calculation
Summary: drm/amd/display: fix initial backlight brightness calculation
Keywords:
Status: NEW
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: 42
Hardware: x86_64
OS: Linux
unspecified
medium
Target Milestone: ---
Assignee: Kernel Maintainer List
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-07-25 16:44 UTC by Philbert Desanex
Modified: 2025-07-25 16:51 UTC (History)
13 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Type: ---
Embargoed:

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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
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