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 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7321FC5DF66 for ; Mon, 17 Aug 2026 11:53:57 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0B13810E774; Mon, 17 Aug 2026 11:53:57 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="dGuDCnlf"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.15]) by gabe.freedesktop.org (Postfix) with ESMTPS id DC89A10E774; Mon, 17 Aug 2026 11:53:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1786967636; x=1818503636; h=from:to:cc:subject:in-reply-to:references:date: message-id:mime-version; bh=+/bqTqtvaMpQwVdt40/6DcZZsmpN3J07tYSFPs6Cu4w=; b=dGuDCnlfVEYGFboO/ouyJx/YEwYfgiKd7J9okzo7K1Q375HppbLKlv+S nFt186j0Afsy92OM58XVnVBvonH2m6JvhN2y6siFaNoFhMvBgi59lgxdC fGMcXUM2t47W36dQUy8PaD3KRC5sc0SdVRANcAbPM0hgJYghdJBznS/2n dybXjI9yItZ14kRskNA60DtfG6cRhkk3l9o2cOR6yvH0qIYEE980U72BN jA+Oq5MctCy4ob7aZDvrJ51n283ILJo6cuvkilSKQViCfxeNdps2dC+t9 nGTa/nuxfRVSUB6F1dSuTzRSOHeWJJlREo8mVBd4X1qJunclRGZb/Qky4 Q==; X-CSE-ConnectionGUID: KYB6KAg8Qr6/V053y1+BVA== X-CSE-MsgGUID: XsrXM72VQbaK4ATi4Ty00A== X-IronPort-AV: E=McAfee;i="6800,10657,11877"; a="91118806" X-IronPort-AV: E=Sophos;i="6.25,228,1779174000"; d="scan'208";a="91118806" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Aug 2026 04:53:56 -0700 X-CSE-ConnectionGUID: PfoUBt8OSIOa3defDweSIA== X-CSE-MsgGUID: yswT0odaTESlrrsrtneepA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,228,1779174000"; d="scan'208";a="266877589" Received: from abityuts-desk1.ger.corp.intel.com (HELO localhost) ([10.245.245.110]) by fmviesa004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Aug 2026 04:53:53 -0700 From: Jani Nikula To: Sasha Levin , stable@vger.kernel.org Cc: Sasha Levin , regressions@lists.linux.dev, intel-xe@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, =?utf-8?B?5ZC05rab?= , Ville Syrjala Subject: Re: [REGRESSION] Panther Lake 8086:b082 internal eDP black after xe takeover since 7.1.6, still present in 7.1.8 In-Reply-To: <20260814193000.13@kernel.org> Organization: Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6 krs Bertel Jungin Aukio 5, 02600 Espoo, Finland References: <20260814193000.13@kernel.org> Date: Mon, 17 Aug 2026 14:53:50 +0300 Message-ID: MIME-Version: 1.0 Content-Type: text/plain X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Fri, 14 Aug 2026, Sasha Levin wrote: >> Known good: 7.1.5-arch1-2 >> First known bad: 7.1.6-arch1-1 >> Latest tested bad: 7.1.8 >> >> When the xe driver takes over from the firmware framebuffer, the >> internal panel becomes completely black. >> Close and reopen the laptop lid. >> The internal panel starts working normally. > > Thanks for the report. I believe the culprit is 2ee8dbd880b1 ("drm/i915/cdclk: > Fix up CDCLK_FREQ_DECIMAL without a full PLL re-enable"), which is in 7.1.6. > > Mainline is affected in exactly the same way and there is no fix upstream yet, > so there is nothing for me to pick up. Please try [1]. BR, Jani. [1] https://lore.kernel.org/r/20260816062344.796615-1-xspeed1989@gmail.com -- Jani Nikula, Intel