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[185.47.220.165]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-429ed7945cesm60488635e9.40.2024.08.17.16.46.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 17 Aug 2024 16:46:51 -0700 (PDT) Message-ID: <1e962f52a2b1bb243227348dc998273eaf19cdab.camel@gmail.com> Subject: Re: [REGRESSION] Brightness at max level after waking up from sleep on AMD Laptop From: Filip Hejsek To: Linux regressions mailing list Cc: alexander.deucher@amd.com, serg.partizan@gmail.com, amd-gfx@lists.freedesktop.org, mario.limonciello@amd.com, hamza.mahfooz@amd.com, ML dri-devel , LKML Date: Sun, 18 Aug 2024 01:46:50 +0200 In-Reply-To: <77KAHS.13UUH2XVHQQF1@gmail.com> References: <77KAHS.13UUH2XVHQQF1@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.52.4 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Hello, On Sat, 2024-07-27 at 19:52 +0300, serg.partizan@gmail.com wrote: > Hello, >=20 > After updating from 6.8.9 to 6.9.1 I noticed a bug on my HP Envy x360=20 > with AMD Ryzen 5 4500U. >=20 > #regzbot introduced: v6.8.9..v6.9.1 >=20 > After waking up from sleep brightness is set to max level, ignoring=20 > previous value. This issue is tracked here: #regzbot link: https://gitlab.freedesktop.org/drm/amd/-/issues/3474 > With the help of Arch Linux team, we was able to track bad commit to=20 > this:=20 > https://gitlab.freedesktop.org/agd5f/linux/-/commit/63d0b87213a0ba241b3fc= fba3fe7b0aed0cd1cc5 >=20 > [...] This commit does not introduce the bug, it only makes it possible to set the ABM level without requiring support from the compositor. It's very likely that the bug has existed for a long time, it just hasn't surfaced because no compositor enabled the ABM power savings featue. Now that power-profiles-daemon can enable it through sysfs, the bug has been exposed. So I think this actually might not be a regression, just a new feature that exposed an old bug. -- Filip