From: Mario Limonciello <superm1@kernel.org>
To: Lauri Tirkkonen <lauri@hacktheplanet.fi>
Cc: stable@vger.kernel.org, regressions@lists.linux.dev,
amd-gfx@lists.freedesktop.org, Wayne Lin <wayne.lin@amd.com>,
Alex Deucher <alexander.deucher@amd.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [REGRESSION] drm/amd/display: backlight brightness set to 0 at amdgpu initialization
Date: Fri, 18 Jul 2025 12:13:30 -0500 [thread overview]
Message-ID: <46de4f2a-8836-42cd-a621-ae3e782bf253@kernel.org> (raw)
In-Reply-To: <aHpb4ZTZ5FoOBUrZ@hacktheplanet.fi>
On 7/18/2025 9:36 AM, Lauri Tirkkonen wrote:
> 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?
>
https://github.com/torvalds/linux/commit/39d81457ad3417a98ac826161f9ca0e642677661
No; it's not currently backported. Assuming it helps your issue I think
it's a good argument to backport.
next prev parent reply other threads:[~2025-07-18 17:13 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-18 7:29 [REGRESSION] drm/amd/display: backlight brightness set to 0 at amdgpu initialization Lauri Tirkkonen
2025-07-18 13:10 ` Mario Limonciello
2025-07-18 14:36 ` Lauri Tirkkonen
2025-07-18 17:13 ` Mario Limonciello [this message]
2025-07-19 1:03 ` Lauri Tirkkonen
2025-07-19 1:14 ` Mario Limonciello
2025-07-19 2:12 ` Lauri Tirkkonen
2025-07-19 15:25 ` Mario Limonciello
2025-07-19 17:39 ` Mario Limonciello
2025-07-20 9:34 ` Lauri Tirkkonen
2025-07-20 9:36 ` [REGRESSION] [PATCH] drm/amd/display: fix initial backlight brightness calculation Lauri Tirkkonen
2025-07-20 10:26 ` Greg Kroah-Hartman
2025-07-21 0:51 ` Lauri Tirkkonen
2025-07-20 12:49 ` Mario Limonciello
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