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 917EEC5DF6A for ; Sat, 15 Aug 2026 02:33:42 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id BA9B110E176; Sat, 15 Aug 2026 02:33:41 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="cijBRYoH"; dkim-atps=neutral Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id 7584E10E011; Sat, 15 Aug 2026 02:33:40 +0000 (UTC) Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 2618043B40; Sat, 15 Aug 2026 02:33:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 42A7F1F00A3A; Sat, 15 Aug 2026 02:33:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786761220; bh=2FmaatKkMyzUBE64aHQdNqraDzLaDpP/Nw9aqEgQk3k=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=cijBRYoHJPCkz+58rURhfjOb+osKKC3AC0bG2fqH1rdUz1pQvyHmvhV2/rdVG4cxa Q062AJVr8X+LZDJwaB5oPG94UKs7a/yEKWQflLKdTNlP2Ojezv43UbEg7lR8I/VlmM SA8ZbgxQwcg+AId3c5FWIVDFNbQxBirsAdLeHIM/ir4AyLsN5oLgCEUwG4pNGINima 4TeQS10wXnh/sHkRlf+9dqReXw4ifZNoTJWFRzgoLaVmnCcyX1Q8wzbjU9k9oYrUTV PnQF/WHzvXzXwEueYOizstf5uh0BBwZAjc46wN0IgzRaOmYMGp0rjDOtf/scB6zdlU flfBUTf0Kiipg== From: Sasha Levin To: 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 Date: Fri, 14 Aug 2026 22:33:13 -0400 Message-ID: <20260814193000.13@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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" > 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. -- Thanks, Sasha