From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3F549C87FC3 for ; Sun, 20 Jul 2025 15:33:00 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 69D0D10E21C; Sun, 20 Jul 2025 15:32:55 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=hacktheplanet.fi header.i=@hacktheplanet.fi header.b="ipPcvZM3"; dkim=pass (2048-bit key; unprotected) header.d=hacktheplanet.fi header.i=@hacktheplanet.fi header.b="XJuhlFvi"; dkim-atps=neutral Received: from out-181.mta0.migadu.com (out-181.mta0.migadu.com [91.218.175.181]) by gabe.freedesktop.org (Postfix) with ESMTPS id C7C2C10E9CA for ; Fri, 18 Jul 2025 14:36:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; s=gibson; bh=mCJTMl6hmU/t/ n7RMrAexSGMCuHAoxTnyKTXuygkquM=; h=in-reply-to:references:subject:cc: to:from:date; d=hacktheplanet.fi; b=ipPcvZM3bpMRJzxRS0cot5qFHDc+uFbNh/ hJrhoxcKvc68HaecB44RlKS7zlclhqvmPniNnPsgpormEgUYIVt6FDOowL7BvGrzRvlvjN otPTSFQUyLVli7gPNsRtNMZlz9J2nvVjLHpcDvUn2N9IQhYfUx3uh57SqfMgMRkc3bsOH0 YXVuBwLGfTW5mwbyxFuTVNwfs/r6vkgDRihTr+MeGUrCO0Q9wT1Y264pYbO5NiR2Ub5/I7 je7NJ2i8fwnZOy9YJkZMXLdWZrsX6ja4gVfP5V8KpCcUZxmIEfvG0a0vaTnNky58NwqVaR yO13azxNMKaq2ZkNDH/eVRUdb84A== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=hacktheplanet.fi; s=key1; t=1752849384; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=U4fWzDUDVjTYg2bPTnEOawxX6k0jS8mMVyArseOI0Ro=; b=XJuhlFvinkI3yznxCnIYv2c0XaEPy6pnW/s+axNlivjtyGr1LBuHtl9DMslPWcbGJOEUI2 NJKOpBr6bVvFxOtkeDf2x/i1lqyo0h3D0fk3h7GvAnkI189C++7fCwsBPCcd9+1beaeaKk vlBmjvmrd1fG82LdTsqNjDR1Up5AZepcwFD/6XEcyCn9TvbQK1pJSJeAQa37bOZYEUTNR1 6+fC2dKgKnu+70i+2Hrdy5ajG6SUg59oPhq9YuuImiVhC5735Mcz7oLPX06Y/ywteZK77h AbGzTzFLwmQqmBtfqA28gVhfve6tglukDQQ+EnkyfN4seCDrbWcNjhknLAcDxg== Date: Fri, 18 Jul 2025 23:36:17 +0900 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Lauri Tirkkonen To: Mario Limonciello Cc: stable@vger.kernel.org, regressions@lists.linux.dev, amd-gfx@lists.freedesktop.org, Mario Limonciello , Wayne Lin , Alex Deucher , Greg Kroah-Hartman Subject: Re: [REGRESSION] drm/amd/display: backlight brightness set to 0 at amdgpu initialization Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Migadu-Flow: FLOW_OUT X-Mailman-Approved-At: Sun, 20 Jul 2025 15:32:54 +0000 X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" 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