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Tue, 25 Aug 2026 17:33:30 +0000 Date: Tue, 25 Aug 2026 20:33:25 +0300 From: Imre Deak To: Dennis Wang CC: Mika Westerberg , Subject: Re: thunderbolt: DP tunnel activation not retried when display NAKs while settling after link reset (Apple Studio Display XDR 2026 on Panther Lake) Message-ID: Reply-To: References: <20260824100750.GC893316@black.igk.intel.com> Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Organization: Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6 krs Bertel Jungin Aukio 5, 02600 Espoo, Finland X-ClientProxiedBy: GVZP280CA0013.SWEP280.PROD.OUTLOOK.COM (2603:10a6:150:272::17) To IA3PR11MB9273.namprd11.prod.outlook.com (2603:10b6:208:573::17) Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA3PR11MB9273:EE_|SA1PR11MB8376:EE_ X-MS-Office365-Filtering-Correlation-Id: 01d05ff6-a5bf-4a78-004c-08df02cefaaf X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016|23010399003|11063799006|5023799004|10067099003|4143699003|6133799003|56012099006|18002099003|22082099003|18092099006; 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The whole panel stays black from > power-on until I type the LUKS passphrase blind; the compositor modeset > after unlock is what first lights it. So it is not one display lighting > up while another stays dark. > > Tested xe.enable_fbc=0 on a cold boot with both sinks active: panel > still black until the compositor modeset (~83s). In that boot I noticed > Panel Replay enabled at 4.7s and disabled at 81.6s, bracketing the > black window exactly, so I also tried xe.enable_panel_replay=0: still > black (until ~123s that time). > > What both logs show: the fbdev client's tiled two-pipe modeset > completes without errors - links train at 5.4G x4, both tunnels get > 17000 Mb/s allocated, transcoders enable (in the fbc=0 boot both pipes > are up by 4.7s) - yet nothing ever appears on the panel. The first > modeset that visibly lights it is the compositor's single-stream > 5120x2880 DSC config after unlock. Thanks. Not sure what could be wrong with the fbdev modeset, no obvious issues in the logs around that. The later compositor modeset config is a bit strange: one pipe is enabled with a 5120x2880 mode and another pipe with a 2560x2880 mode, as if the tile configuration would be ignored. Could you check what's the compositor's idea of the monitors and modes and try to set a 2560x2880 mode (after booting with disabling both fbc and panel replay)? I think it'd be easier to follow up on a ticket, could you please open one at https://gitlab.freedesktop.org/drm/xe/kernel/-/work_items/new?type=Issue and attach the log after setting the above 2560x2880 mode? Could you also attach the log there when booting with video=DP-2:d? > Consistent with that: booting with video=DP-2:d (second sink masked, > single-stream from the start) is fully clean on every boot, LUKS prompt > visible at ~4s. > > Both dmesgs attached (timestamps rebuilt from > _SOURCE_MONOTONIC_TIMESTAMP as before). Happy to test patches or more > knobs. > > Thanks, > Dennis > > Imre Deak 于2026年8月25日周二 17:35写道： > > > > > > Hi Dennis, > > > > thanks for the logs. > > > > Could you confirm that the problem you see is: > > > > After boot-up with both displays connected, one of the display is blank > > by 4.839037, while the other display lights up okay. > > > > By 47.768154 both displays light up correctly. > > > > I can't see any obvious issues related to tunneling, both tunnels are > > detected and the BW allocations for them succeed as expected. > > > > Could you try if the same sequence without the other issue you mentioned > > happening (DP tunnel activation failed) the blank screen problem > > reproduces booting with: xe.enable_fbc=0 ? > > > > Thanks, > > Imre > > > > On Tue, Aug 25, 2026 at 09:42:23AM +0800, Dennis Wang wrote: > > > Hi Mika, Imre, > > > > > > Attached: cold boot dmesg with thunderbolt.dyndbg=+p + drm.debug=0x10e > > > (timestamps rebuilt from _SOURCE_MONOTONIC_TIMESTAMP; root fs is LUKS > > > so journald re-stamps initramfs kmsg). > > > > > > This boot hit the graphics-side flavor - tunnels healthy, screen black > > > until the LUKS passphrase was typed blind at ~40 s: > > > > > > 1.8s XDR found, Gen3 x2, both DP tunnels allocated, no errors > > > 3.9s second sink (0:10 <-> 3:12): repeated "DPRX read timeout" > > > (tiled 2x1 panel, two DP sinks) > > > 3.96s fastset rejected: crtc_hblank_start expected 3840, found 1920 > > > 11.3s AUX_TC2 power well disabled - nothing lights the panel again > > > until the compositor modeset after unlock (~60 s) > > > > > > A control cold boot with video=DP-2:d (masking the second sink) is > > > fully clean, panel lit at ~4 s, single-stream 5K120 DSC. The original > > > "DP tunnel activation failed" flavor is intermittent - will send it > > > with full debug when I catch it. > > > > > > Happy to test patches on this hardware. > > > > > > Thanks, > > > Dennis Wang > > > > > > > -- > Best Regards > Dennis.Wang > Zoom