From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bmailout2.hostsharing.net (bmailout2.hostsharing.net [83.223.78.240]) (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 3EC25301465; Wed, 28 Jan 2026 15:56:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=83.223.78.240 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769615784; cv=none; b=fiMmQGpYiCtyrmhdf9kBheaImwrMf2BatsB/IW7sOLx4ZZEzMuTY0x3mDSyh8Vcjw/fJUeWDnBBPXdiyP6M1JgXENdH7X4eD4raqI0X66RuJcQ8dEVyL51/qTUtU98Mc9D8gW+OYaYpsIVDXYz5TZeQ6KUbt/sqt9QA5l/l4AS8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769615784; c=relaxed/simple; bh=WqhnbiU063jiHgDsbB4pAy8Oh04vmWgVP9qS90nduig=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=H3gWAbnwdGirfKRcPYWlzW/jCIDfxPWyakIThfUDD5apQg1vuvpjYSZwtRbuVwLBZHxATa0xv9yUc1CWEqUvyPEbc9yIlXgrotkF6mQC2Rdrpb+kzk2eaWtNAY7B01Mc6riz4ckoSvcxHwoSQPaFjON/TxQe5lvdL5tPkkdrMb8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=wunner.de; spf=none smtp.mailfrom=h08.hostsharing.net; arc=none smtp.client-ip=83.223.78.240 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=wunner.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=h08.hostsharing.net Received: from h08.hostsharing.net (h08.hostsharing.net [83.223.95.28]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1) server-digest SHA384 client-signature ECDSA (secp384r1) client-digest SHA384) (Client CN "*.hostsharing.net", Issuer "GlobalSign GCC R6 AlphaSSL CA 2025" (verified OK)) by bmailout2.hostsharing.net (Postfix) with ESMTPS id 57D162009D01; Wed, 28 Jan 2026 16:56:21 +0100 (CET) Received: by h08.hostsharing.net (Postfix, from userid 100393) id 43F1435135; Wed, 28 Jan 2026 16:56:21 +0100 (CET) Date: Wed, 28 Jan 2026 16:56:21 +0100 From: Lukas Wunner To: Atharva Tiwari Cc: Ard Biesheuvel , Jani Nikula , Rodrigo Vivi , Joonas Lahtinen , Tvrtko Ursulin , David Airlie , Simona Vetter , Javier Martinez Canillas , Thomas Zimmermann , Lenny Szubowicz , Ingo Molnar , Francesco Pompo , linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: Re: [PATCH v2 0/2] Add support for eGPUs on Apple Products Message-ID: References: <20260128145855.1071-1-atharvatiwarilinuxdev@gmail.com> Precedence: bulk X-Mailing-List: linux-efi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260128145855.1071-1-atharvatiwarilinuxdev@gmail.com> On Wed, Jan 28, 2026 at 02:58:36PM +0000, Atharva Tiwari wrote: > This series adds support for eGPUs on Apple products, by > enabling apple-set-os on all apple devices. > > A side effect of this patch is that the iGPU becomes enabled on iMacs. > However, iMacs can’t use the iGPU to drive the display > (They can't link-train the internal display), > so displays must be disabled on iMacs. Oh there's the explanation that should have been in the commit message of patch [2/2]. It's possible that the iMac has a multiplexer built-in which can switch between the iGPU and dGPU at runtime. Please ensure that you have set CONFIG_APPLE_GMUX=y in your .config, the gmux driver should bind to the multiplexer if there is one. If there is a multiplexer built-in, then disabling the iGPU is the wrong approach. Thanks, Lukas