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Tue, 11 Aug 2026 05:26:29 -0700 (PDT) Message-ID: <8a0fad2d-788a-403f-a880-2f97c6708275@gmail.com> Date: Tue, 11 Aug 2026 14:26:28 +0200 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [REGRESSION] Please revert 1191285ecb42 from 7.1.y To: Greg KH Cc: Thorsten Leemhuis , stable@vger.kernel.org, Mario Limonciello , Alex Deucher , Linux kernel regressions list , "amd-gfx@lists.freedesktop.org" , =?UTF-8?Q?Christian_K=C3=B6nig?= , George Zhang 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> Content-Language: en-US, it-IT From: Sergio Callegari In-Reply-To: <2026081151-reabsorb-calamari-7442@gregkh> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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. Best, Sergio