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Tue, 18 Aug 2020 10:49:02 +0000 Subject: Re: [PATCH 4.19 040/168] drm/radeon: disable AGP by default To: Pavel Machek , Greg Kroah-Hartman Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org, Alex Deucher , Sasha Levin References: <20200817143733.692105228@linuxfoundation.org> <20200817143735.768643197@linuxfoundation.org> <20200818094135.GC10974@amd> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: <06ccec09-ecd2-b18f-6234-7409f2a3c30a@amd.com> Date: Tue, 18 Aug 2020 12:48:57 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 In-Reply-To: <20200818094135.GC10974@amd> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-ClientProxiedBy: AM4PR07CA0004.eurprd07.prod.outlook.com (2603:10a6:205:1::17) To MN2PR12MB3775.namprd12.prod.outlook.com (2603:10b6:208:159::19) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [IPv6:2a02:908:1252:fb60:be8a:bd56:1f94:86e7] (2a02:908:1252:fb60:be8a:bd56:1f94:86e7) by AM4PR07CA0004.eurprd07.prod.outlook.com (2603:10a6:205:1::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3305.10 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3bb0fbf1-40af-4bcf-8b4b-08d8436451c2 X-MS-Exchange-CrossTenant-AuthSource: MN2PR12MB3775.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Aug 2020 10:49:02.5457 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 0HOfQ0zLoXhwKtybyf80Eu0tMUo8xo9oU01Ou+gr92CCTj2ePHUAotLEyMb7Y3TE X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4343 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am 18.08.20 um 11:41 schrieb Pavel Machek: > On Mon 2020-08-17 17:16:11, Greg Kroah-Hartman wrote: >> From: Christian König >> >> [ Upstream commit ba806f98f868ce107aa9c453fef751de9980e4af ] >> >> Always use the PCI GART instead. We just have to many cases >> where AGP still causes problems. This means a performance >> regression for some GPUs, but also a bug fix for some others. > Yes, and the regressions mean this is not suitable for -stable, right? The stability fix weight more than the performance regression for some GPUs. So this is indeed meant to be back ported to stable. This just modifies the default of the module parameter. The end user case still override it with radeon.agp_mode=4 or 8 if those modes work stable for the individual case. Regards, Christian. > > Best regards, > Pavel