From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailbackend.panix.com (mailbackend.panix.com [166.84.1.89]) (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 AE5971925AE; Mon, 6 Jan 2025 04:31:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=166.84.1.89 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736137897; cv=none; b=YttDGhnVMxHNkZ1ELywyBoze2z716bCoZil7xMmQS5RC+FUhKnabzrI9TxRMyzZoXyvZ15hUASR8qMvaJ5941PDjDVolo6dGSSDq6lUTap68CL2bNy0doeSVigbT/3IsUPBTB8I2SluFosB4IuyC8eVooPnoMwk8qOB5cYY1+bg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736137897; c=relaxed/simple; bh=6qHr8IEARPNhqSU1wZBWFqlZVqZ63jCI8dv0qaCgp3c=; h=Date:To:Cc:Subject:References:In-Reply-To:MIME-Version: Content-Type:Message-Id:From; b=MYSuz0e9GdfAvJ2Ug1dY10WVnk/OVmwMSOG1kHD156NPAfu6MUXYCZUqIs6A5yjDNjOsbo6Xz8d+2VlMGU6Z/VjD3KCf/nOsUhu/jmA1WF0mWSPk80KFsOrvVEEZxP5ZqH871SgBJVL53FOsMmARHHTgtUgE/oFI2z6ebK4hIYs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=panix.com; spf=pass smtp.mailfrom=panix.com; dkim=pass (1024-bit key) header.d=panix.com header.i=@panix.com header.b=Fi2UU51g; arc=none smtp.client-ip=166.84.1.89 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=panix.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=panix.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=panix.com header.i=@panix.com header.b="Fi2UU51g" Received: from panix2.panix.com (panix2.panix.com [166.84.1.2]) by mailbackend.panix.com (Postfix) with ESMTP id 4YRLq93lF6z45Hg; Sun, 5 Jan 2025 23:31:33 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=panix.com; s=panix; t=1736137893; bh=6qHr8IEARPNhqSU1wZBWFqlZVqZ63jCI8dv0qaCgp3c=; h=Date:To:Cc:Subject:References:In-Reply-To:From; b=Fi2UU51g5Rf4hWPRSEi2OcfjSIJJ9bIAyiL9QpQoJiVrrlnCzaAqE5TRGYkn4R8Zg yf08mo2eTtmmTbzFyDSI/KOcY/5rz5KnLo3SqtAj7WZa26+Z8jkjlgsIjCalGr2FP+ bWHBbFdwT5Tcs3EiJdpG0PMuIaeshIXSsjeF1jdE= Received: by panix2.panix.com (Postfix, from userid 19171) id 4YRLq93qSpz1ZSy; Sun, 5 Jan 2025 23:31:33 -0500 (EST) Date: Mon, 06 Jan 2025 04:31:33 +0000 To: me@svmhdvn.name, alexdeucher@gmail.com Cc: pa@panix.com, Xinhui.Pan@amd.com, stable@vger.kernel.org, regressions@lists.linux.dev, linux-kernel@vger.kernel.org, christian.koenig@amd.com, amd-gfx@lists.freedesktop.org, alexander.deucher@amd.com Subject: Re: [REGRESSION] amdgpu: thinkpad e495 backlight brightness resets after suspend References: In-Reply-To: User-Agent: nail 11.25 7/29/05 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Message-Id: <4YRLq93qSpz1ZSy@panix2.panix.com> From: Pierre Asselin Alex Deucher wrote: > On Mon, Dec 23, 2024 at 4:08 AM Siva Mahadevan wrote: > > > > #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)". > > Odd. That commit shouldn't affect the backlight per se. > > > > > 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) > > Please file a ticket here: > https://gitlab.freedesktop.org/drm/amd/-/issues > and attach your full dmesg output and we'll take a look. > > Thanks, > > Alex Alex, Siva: I see the same thing on 6.6.69 . Hardware: HP EliteBook 745 G6 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Picasso/Raven 2 [Radeon Vega Series / Radeon Vega Mobile Series] (rev d1) It bisects to 2daba7d857e48035d71cdd95964350b6d0d51545 . Upstream commit is 73dae652dcac776296890da215ee7dec357a1032 , same as in Siva's case. I'll see if I can create an account at gitlab and file an issue. I can test patches, preferably off a mainline kernel. Otherwise, I'll need hand holding with git. --Pierre Asselin