From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 77EB5C433ED for ; Fri, 14 May 2021 12:34:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 52884613D6 for ; Fri, 14 May 2021 12:34:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233419AbhENMfv (ORCPT ); Fri, 14 May 2021 08:35:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55040 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233019AbhENMft (ORCPT ); Fri, 14 May 2021 08:35:49 -0400 Received: from vulcan.natalenko.name (vulcan.natalenko.name [IPv6:2001:19f0:6c00:8846:5400:ff:fe0c:dfa0]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3B5B5C061574 for ; Fri, 14 May 2021 05:34:37 -0700 (PDT) Received: from localhost (unknown [151.237.229.131]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by vulcan.natalenko.name (Postfix) with ESMTPSA id 388E6A7F2E9; Fri, 14 May 2021 14:34:32 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=natalenko.name; s=dkim-20170712; t=1620995672; 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: in-reply-to:in-reply-to:references:references; bh=4vwJiGTh6ElCKYC/wP6uUt98bvM4B8L74svpei6Ju4s=; b=k4P0PRaU0pOt6NoAaXdArjthun1X5Z3xm0J1NP99QO/kCvs7gH1yjGmb+kD3/UPVsnEPt0 i524R6BXymUAbd3WqekM3GGLRvv1td6RiAvViZTPemp6ph4IkukuqsnjhA+G5TSxVEcWmM uBtPbYE483kRT7/HYynefUDrEIeOnvE= Date: Fri, 14 May 2021 14:34:31 +0200 From: Oleksandr Natalenko To: Thomas Stein Cc: linux-kernel@vger.kernel.org, Kai-Heng Feng , Ville =?utf-8?B?U3lyasOkbMOk?= , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , David Airlie , Daniel Vetter , Imre Deak , Manasi Navare , Lyude Paul , Ankit Nautiyal , Lucas De Marchi , Sean Paul , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: Re: thinkpad x1 carbon display flickering after update to 5.12. good on 5.11.x (i915) Message-ID: <20210514123431.fqvaa437zlw7rq7j@spock.localdomain> References: <1a6cf0a3dc8a2c6364265ad7249b76b1@meine-oma.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1a6cf0a3dc8a2c6364265ad7249b76b1@meine-oma.de> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello. On Fri, May 14, 2021 at 10:24:26AM +0200, Thomas Stein wrote: > After upgrading to linux 5.12 the display on my X1 Carbon Gen 2 starts to > flicker. Well actually it seems to turn off and on again and again. Here a > link to a video a person posted who has the same issue as me obviousely. https://linuxove.com/thinkpad-x1-carbon-gen-3-display-flickering-on-linux-kernel-5-12/ > > This happens without having Xorg running too. So it can't be related to > Xorg. The kernel boots and after a few seconds, the kernel messages scoll > through, the flickering starts. Nothing special in dmesg. > > dmesg: > > himbeere@rather ~ $ dmesg | grep i915 > [ 0.713595] i915 0000:00:02.0: vgaarb: deactivate vga console > [ 0.720280] i915 0000:00:02.0: vgaarb: changed VGA decodes: > olddecodes=io+mem,decodes=io+mem:owns=io+mem > [ 0.741494] i915 0000:00:02.0: [drm] Panel advertises DPCD backlight > support, but VBT disagrees. If your backlight controls don't work try > booting with i915.enable_dpcd_backlight=1. If your machine needs this, > please file a _new_ bug report on drm/i915, see > https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs for > details. > [ 1.864837] [drm] Initialized i915 1.6.0 20201103 for 0000:00:02.0 on > minor 0 > [ 1.875907] fbcon: i915drmfb (fb0) is primary device > [ 3.158255] i915 0000:00:02.0: [drm] fb0: i915drmfb frame buffer device > himbeere@rather ~ $ > > Downgrading to 5.11 solves the issue for me. Any ideas? Does [1] fix your issue? [1] https://cgit.freedesktop.org/drm-tip/patch/?id=acca7762eb71bc05a8f28d29320d193150051f79 -- Oleksandr Natalenko (post-factum)