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Tue, 11 Aug 2026 00:28:53 -0700 (PDT) Received: from [192.168.10.195] ([188.216.175.96]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4997415df9asm41374625e9.13.2026.08.11.00.28.52 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 11 Aug 2026 00:28:52 -0700 (PDT) Message-ID: <1caea72e-b9c8-452b-a3ff-5690d948b4fc@gmail.com> Date: Tue, 11 Aug 2026 09:28:52 +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: Thorsten Leemhuis , Greg KH Cc: 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> Content-Language: en-US, it-IT From: Sergio Callegari In-Reply-To: <23db5f95-c2d6-4712-856e-28f647e184f7@leemhuis.info> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 11/08/2026 07:24, Thorsten Leemhuis wrote: > > And yes, 6.18.y seems affected, too, according to a comment in the > ticket linked below. > Yes, my bad I only mentioned 7.1.6 to be quick. My actual concern is that the troublesome commit got to the LTS kernels, which I think is the biggest issue right now. People may find their display completely black or almost black as soon as their DE starts. Getting to the conclusion that they need to /reduce/ the brightness to recover is not totally obvious and is not applicable at all if you have a system that is touchscreen only (since you won't be able to see where to press). >> It needs to be reverted in Linus's tree first, otherwise the regression >> will be hit when you update to 7.2. Indeed, but I think the biggest issue is with the LTS kernels right now. > Normally I'd agree, but according to one reporter that problem does not > happen with 7.2-rc: > https://gitlab.freedesktop.org/drm/amd/-/work_items/5562#note_3603131 I'll see if I can try myself the 7.2 RCn series. From my superficial analysis of the commits that brought us to the current situation, the troublesome commit actually tried to patch on a true issue, namely that the user facing brightness data is not mapped symmetrically to the hardware data, but that the correct solution involves some more thorough rework of the brightness coordinate system. So there may well be some larger activity on it on upstream. > > Given all that I wonder if dropping that commit for now might be the > best move. Personally, I think that dropping on the stable series would be beneficial, unless upstream can now offer a correct solution to pick. Behavior you get by dropping is not 100% ideal but certainly not as bad as what you get with the problematic commit. Best, Sergio