From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx3.molgen.mpg.de (mx3.molgen.mpg.de [141.14.17.11]) (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 9EA441CDFCE for ; Mon, 30 Jun 2025 08:49:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=141.14.17.11 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751273395; cv=none; b=dAY/7LiiMhSgoNfq3Zxs5jb85+89eQ+yq/GIPDF9K/g+upCX1rHjrqaK6/rNMhU8YceRYbtdH7q+w9nC6tS/a+uzRdR8zrW0nKCISoCOpZ0uCU0nHHuz0UmKpMuGk4HSFUucwpf0V1sC2OJlxuMHv1zfw+KcKkWn0OjJUmnllZk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751273395; c=relaxed/simple; bh=/T1XmqLkHGmZ4HU8CZhuAPLKatyDiVqkgbmpJsILy3E=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=CSjRl95Z1PNeIpKFwyuv8OEIVWtu6cM26zNxVGCwti8e8MIqyhMtpgQBx95KLkkB1QB6rX4gQnFOarriZV/MaEJWtByQEF8s26vLMOLkM5XCyH0vb9kDi8Px8DTIu9kNnB9q3lqbkf/vOGXg9aS5Weqf4VAsqljkFARpwPjUgnU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=molgen.mpg.de; spf=pass smtp.mailfrom=molgen.mpg.de; arc=none smtp.client-ip=141.14.17.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=molgen.mpg.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=molgen.mpg.de Received: from [192.168.2.196] (p5dc55466.dip0.t-ipconnect.de [93.197.84.102]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id 17BD061E64787; Mon, 30 Jun 2025 10:49:17 +0200 (CEST) Message-ID: <16a1a6de-e2e2-4fed-9ca0-7bca50c7169c@molgen.mpg.de> Date: Mon, 30 Jun 2025 10:49:16 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [Regression] Panel flickering on Dell XPS 13 9360 with drm-fixes-2025-06-28 merged (Linux 6.16-rc4) To: Imre Deak Cc: Jarkko Nikula , Rodrigo Vivi , intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, LKML , regressions@lists.linux.dev References: Content-Language: en-US From: Paul Menzel In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Dear Imre, Thank you for your reply. Am 30.06.25 um 09:41 schrieb Imre Deak: > On Sun, Jun 29, 2025 at 11:04:31PM +0200, Paul Menzel wrote: >> Just a heads-up, that very likely, merging of branch *drm-fixes-2025-06-28* >> causes flickering of the panel of the Intel Kaby Lake laptop Dell XPS 13 >> 9360. 6.16.0-rc3 works fine, and with 6.16-rc3-00329-gdfba48a70cb6 the panel >> flickers. I try to bisect, but maybe you already have an idea. > > One possibility is: > a3ef3c2da675 ("drm/dp: Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS") Yes, that is the one my bisection pinpointed. > Could you open a ticket for this and provide a drm.debug=0x10e log with > 6.16-rc4 and try if the following commits in drm-tip fixes the issue?: > > 5281cbe0b55a ("drm/edid: Define the quirks in an enum list") > 0b4aa85e8981 ("drm/edid: Add support for quirks visible to DRM core and drivers") > b87ed522b364 ("drm/dp: Add an EDID quirk for the DPCD register access probe") > ed3648b9ec4c ("drm/i915/dp: Disable the AUX DPCD probe quirk if it's not required") > > I also pushed these to: > https://github.com/ideak/linux/commits/dpcd-probe-quirk I created issue *[Regression] Panel flickering on Dell XPS 13 9360 with drm-fixes-2025-06-28 merged (Linux 6.16-rc4)* [1], and will try your proposed fixes later. […] Kind regards, Paul [1]: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/14558