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Tue, 30 Sep 2025 09:04:46 +0000 Message-ID: Date: Tue, 30 Sep 2025 02:04:38 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [REGRESSION] drm/xe/guc: Lenovo Thinkpad X1 Carbon Gen 12 can't boot with 6.16.9 and Xe driver To: Sasha Levin , =?UTF-8?Q?Iy=C3=A1n_M=C3=A9ndez_Veiga?= CC: Thorsten Leemhuis , , , Greg Kroah-Hartman References: <616f634e-63d2-45cb-a4f9-b34973cc5dfd@iyanmv.com> <88ffbb16-bd1a-4d96-a10d-69516f98036e@leemhuis.info> <92577e77-3f40-45a3-8e67-d9c6f5ffeb86@iyanmv.com> Content-Language: en-US From: Daniele Ceraolo Spurio In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: WA2P291CA0010.POLP291.PROD.OUTLOOK.COM (2603:10a6:1d0:1e::16) To PH7PR11MB7605.namprd11.prod.outlook.com (2603:10b6:510:277::5) Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH7PR11MB7605:EE_|CY8PR11MB7195:EE_ X-MS-Office365-Filtering-Correlation-Id: 65803665-2844-4e1c-6c58-08de000066ca X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016; 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Could you also try if reverting the patch from 6.16.y helps? Note, >>> you might need to revert "drm/xe/guc: Set RCS/CCS yield policy" as >>> well, >>> which apparently depends on the patch that causes your problems. >> >> Yes, reverting both dd1a415dcfd5 "drm/xe/guc: Set RCS/CCS yield >> policy" and 97207a4fed53 "drm/xe/guc: Enable extended CAT error >> reporting" from 6.16.y fixes the issue for me. > > Thanks for the report and investigation! > > I'll revert these two. > Hi, Thanks for the bisect and the quick turnaround on this (and sorry for not replying earlier, I just came back from vacation :) ). Just wanted to add a quick comment as the author of both patches. I have no idea why these patches would cause issues on 6.16 but not on 6.17, nothing significant should be different between the two releases in the impacted area. However, no one has actually ever reported hitting the starvation issue mitigated by the RCS/CCS patch (which has been there since 6.13), likely because it can only be reproduced if the GPU is heavily overloaded by multiple apps; therefore, given that 6.16 is not an LTS, I'm not going to attempt to reproduce and debug this and re-send the patches for that kernel version. Please let me know if there are any concerns with this approach or if the issue pops up on 6.17. Thanks Daniele