[REGRESSION] drm/amd/display: backlight brightness set to 0 at amdgpu initialization

[Lauri Tirkkonen]

On Fri, Jul 18 2025 08:10:06 -0500, Mario Limonciello wrote:
> Do you by chance have an OLED panel?  I believe what's going on is that
> userspace is writing zero or near zero and on OLED panels with older kernels
> this means non-visible.

Yes, this is an OLED panel. But I don't believe it's userspace writing
anything at this point in the boot; before the bisected commit,
brightness was set to 32 (out of max 255) on this hardware when I
checked from the initramfs rescue shell. At the bisected commit, it's 0
(out of max 255).

> There is another commit that fixes the behavior that is probably missing.

Which commit is that? It's not in 6.15.7?

-- 
Lauri Tirkkonen | lotheac @ IRCnet