Received: from out-180.mta0.migadu.com (out-180.mta0.migadu.com [91.218.175.180]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1204E2BD590 for ; Fri, 18 Jul 2025 14:36:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.180 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752849390; cv=none; b=L7TMjRnECR8Puu8mzEN2DMcxRZGkcN1AQvHCXd7DfdQOymvwU+ctWNbgPb3qpYaUvntSxCXKUMWaQypkIguTVNhRFKKSQ5VbjHkUsvioNlqMjJHIJkZwX0V2b903/ye+YZWhyQGgLkpXxo9iNPWmDIdkYS95+yT4AAr6q3e2E50= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752849390; c=relaxed/simple; bh=mCJTMl6hmU/t/n7RMrAexSGMCuHAoxTnyKTXuygkquM=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=qu4tpm4OTOW2e7fLjLhc3NlVvEIEmRZahSLM1ldkgsN7W77eJQC6s0FLSoq9MMB1L9jfPoQfkAOjxlRmp0ZhuyRTaOoEKKC/HtDaUm8QGtexdinVNyrcwkaWupjF+nQW7tSilzMTDG1Cxg6M1P7BW00BFosl3qfxPqIuO3x1Iuc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=hacktheplanet.fi; spf=pass smtp.mailfrom=hacktheplanet.fi; dkim=pass (2048-bit key) header.d=hacktheplanet.fi header.i=@hacktheplanet.fi header.b=ipPcvZM3; dkim=pass (2048-bit key) header.d=hacktheplanet.fi header.i=@hacktheplanet.fi header.b=XJuhlFvi; arc=none smtp.client-ip=91.218.175.180 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=hacktheplanet.fi Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=hacktheplanet.fi Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=hacktheplanet.fi header.i=@hacktheplanet.fi header.b="ipPcvZM3"; dkim=pass (2048-bit key) header.d=hacktheplanet.fi header.i=@hacktheplanet.fi header.b="XJuhlFvi" 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: Precedence: bulk X-Mailing-List: regressions@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Migadu-Flow: FLOW_OUT 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