From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from diary.svmhdvn.name (diary.svmhdvn.name [174.136.98.26]) (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 27CF61D9320 for ; Sat, 21 Dec 2024 22:42:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=174.136.98.26 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734820943; cv=none; b=tYr5dpuQVrLWVR/KkLqnDNePPQbCiNewG/4T8RjSITVhcoPEcgr6ud5faumHjpsBWP4NPFwNfiDzomg1Vad5w90XktbN8z+lzKnv/so6aMZ2Im1Ei/HNIXPGD+Ls3RkC27ThJwYDDPn7zKtryEEVhFNhmbN1GM485UVXzSS7o/o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734820943; c=relaxed/simple; bh=yS+bnikUls+gxphI2NHeQo2aumEG3eqFwSybwO5fkrE=; h=Mime-Version:Content-Type:Date:Message-Id:Subject:Cc:From:To; b=RT0px+2Ag+AtnGUqRPcz2a4BzXkwkZlClpNVvB2qf+45zkHPtD/gPWFQuAPcy4OGCUwFW2C7Sv/nZ+NrFu95TiCH/lPIYMeIf9fFc1sjdyRpUEC4f+5dTyZeRB0NasV0iLZCQooXzdQEUDp9VD2lZX6I44w340ByjdrGqDWncSU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=svmhdvn.name; spf=pass smtp.mailfrom=svmhdvn.name; dkim=pass (2048-bit key) header.d=svmhdvn.name header.i=@svmhdvn.name header.b=trl652hQ; arc=none smtp.client-ip=174.136.98.26 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=svmhdvn.name Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=svmhdvn.name Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=svmhdvn.name header.i=@svmhdvn.name header.b="trl652hQ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=svmhdvn.name; s=diary1; t=1734820548; 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: content-transfer-encoding:content-transfer-encoding; bh=h9vROm/ucFrO1Zn4KeEKv/82NzYWKSb+97vYad00O+U=; b=trl652hQOgNnOU5zQ6CZeRa2MYaQA3yT9JHZ+kaD5IU5bLnPZ/rD2U/ES0YvhKijfUQLdV UG9LahF9SPPDaX94egagfw0Rps/YtczC24pZCjpocYdf9cX0SjhqZ4CNPTVLvw0Fhc/+Lc 5QQpA3PSiG+VY+oi2cvHY/QLDRVun0GEgfXQVafTQWQ6WqYXihLF1oLmQ9D5rqYQ/hifDT iJWGIaMxgzCeoNrTUOGOG1bb+vm2ykjhfpg2j2lt17d+lFaS1lhQix1OSLuhr94Yn4ZtuN CWs3JJ4fVV1i4e2kPREX2ZvASlvlac5fwfpeStNJzdc7e/fAh7R8cPJkkZm2RQ== Received: by diary.svmhdvn.name (OpenSMTPD) with ESMTPSA id 5ec79cca (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Sat, 21 Dec 2024 22:35:46 +0000 (UTC) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Sat, 21 Dec 2024 17:35:37 -0500 Message-Id: Subject: [REGRESSION] amdgpu: thinkpad e495 backlight brightness resets after suspend Cc: , , , , , From: "Siva Mahadevan" To: X-Mailer: aerc 0.18.2 #regzbot introduced: 99a02eab8 Observed behaviour: linux-stable v6.12.5 has a regression on my thinkpad e495 where suspend/resume of the laptop results in my backlight brightness settings to be reset to some very high value. After resume, I'm able to increase brightness further until max brightness, but I'm not able to decrease it anymore. Behaviour prior to regression: linux-stable v6.12.4 correctly maintains the same brightness setting on the backlight that was set prior to suspend/resume. Notes: I bisected this issue between v6.12.4 and v6.12.5 to commit 99a02eab8 titled "drm/amdgpu: rework resume handling for display (v2)". Hardware: * lenovo thinkpad e495 * AMD Ryzen 5 3500U with Radeon Vega Mobile Gfx * VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Picasso/Raven 2 [Radeon Vega Series / Radeon Vega Mobile Series] (rev c2)