From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 57941285C8B; Wed, 12 Aug 2026 00:13:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786493640; cv=none; b=HXoQArKr74yQ0/kfH0KSWnVL15ym2LTgBONimmmnZMH9sIq3brCUqX2cZKx3DOmfXE954Ix0QY62epjWDRuD3OcCbd/dRe9lY2BByvqp71C/D3D39gvkWVucJVS1E70gvwX5XP2XmSJkyodnM4FuyOdEtX//pb19cPQNrmVCRXo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786493640; c=relaxed/simple; bh=Vrre/c5A7Wz5bRLO6riBq6PZZObmEldb/gAeCaQKYFw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=aXOmn1ViE9VDI7WYFCQuIr8kp4hT9+v/bxDEubd9M3DTN4FUxSBOrrQ1Td8oVdTEZXTe9bVL96nGIslp9tGYq1j9wZ0O3XRmnDIRNyu76uWXQwTRxhCLoj2MGV6xK6Zl5TxMOvzoHvMONL/EYQK8NRnqLuC3AJfeNooH5/uyz7g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=YcQXNkR+; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="YcQXNkR+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7BD1D1F00A3A; Wed, 12 Aug 2026 00:13:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786493638; bh=K906TWK3NX4+ZpiFv6QQYIMRy2gKRZnzgTB4Few++Ms=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=YcQXNkR+vw9/ibatGK4jbM+armsihiYQcgu0F8rBYfWGFc3ssBu9PAHUsf3+YcUB2 V2kjLAJ6wOpgawDKeBuGyQHgdNGOJtUtLH5tLrN0atHfblBZ6+RN44V6UjPxWc+2hI WhLndLDlrVN6p1nxN/dUFF0m1xMsry/Le1sdMIcE= Date: Wed, 12 Aug 2026 09:12:26 +0900 From: Greg KH To: Alex Deucher Cc: Sergio Callegari , Thorsten Leemhuis , stable@vger.kernel.org, Mario Limonciello , Alex Deucher , Linux kernel regressions list , "amd-gfx@lists.freedesktop.org" , Christian =?iso-8859-1?Q?K=F6nig?= , George Zhang Subject: Re: [REGRESSION] Please revert 1191285ecb42 from 7.1.y Message-ID: <2026081216-goon-nicotine-6d62@gregkh> References: <9c6acb62-4080-48e6-9ba2-d1c457c4ec88@gmail.com> <2026081106-pebbly-cahoots-37a7@gregkh> <23db5f95-c2d6-4712-856e-28f647e184f7@leemhuis.info> <1caea72e-b9c8-452b-a3ff-5690d948b4fc@gmail.com> <2026081151-reabsorb-calamari-7442@gregkh> <8a0fad2d-788a-403f-a880-2f97c6708275@gmail.com> Precedence: bulk X-Mailing-List: regressions@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Tue, Aug 11, 2026 at 01:25:14PM -0400, Alex Deucher wrote: > On Tue, Aug 11, 2026 at 11:25 AM Sergio Callegari > wrote: > > > > On 11/08/2026 10:08, Greg KH wrote: > > > We aim to be "bug compatible" with Linus's branch, otherwise the > > > "pressure" to fix those bugs goes down. But I defer to the maintainers > > > of the code involved if it is being worked on, and they want it > > > reverted, great, we can do that. Otherwise we prefer to leave it as-is. > > > > I understand. Sorry for asking about things that might be obvious to > > most people here. My expectation was that only a selected subset of the > > patches on the Linus' tree were to enter in stable, so do we really need > > to have stable "bug compatible" wrt this bug? The original behavior was > > not free of issues, but they were rather minor (a reporting issue). Now > > we have this very bad behavior where the display remains dark. > > > > To make the matter worse, on systems that have encrypted root the screen > > remains dark also on that password prompt (observed with plymouth). > > > > In any case, I managed testing 7.2.0RC7 and it is fine again. > > > > Looks like the Linus' tree has more changes wrt backlight, and the > > interesting ones are probably those in the cumulative fix > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=973fd9493ec21f12e760fbbedeb7b0b2317c02f4. > > > > Thanks for testing. It sounds like we should revert the change from > stable. There must be some dependency we are missing in stable. Great, can someone send a revert? thanks, greg k-h