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 2747DE78491 for ; Wed, 24 Dec 2025 21:41:10 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 3067A10E3D5; Wed, 24 Dec 2025 21:41:09 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="fi3VNGOZ"; dkim-atps=neutral Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by gabe.freedesktop.org (Postfix) with ESMTPS id 48B5110E3D5 for ; Wed, 24 Dec 2025 21:41:08 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 6724B60010 for ; Wed, 24 Dec 2025 21:41:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id CC6C4C116C6 for ; Wed, 24 Dec 2025 21:41:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1766612466; bh=8H/o0PZszVlMuaY8DOT7jGxZt7c4fgbfqG2JBLwj190=; h=From:To:Subject:Date:From; b=fi3VNGOZ2BsMAJcQwIVbGQbLZKnxap0gL3Sb4L83m/CP2O6IW7dDABzKDmeWBQxV/ SdfCQHgz5dz2OTnSO+u03kJPNpuqaxlpl7iaT/STbkihFaofgxdb+kKkFOhhpKKPJC cfwW0AhZn5WpQfocxfp3VYQnuKkVuVpqbxjzqjDVGPYVm7/q04m9luEPBWfn/m/gVH ijPROwlb4j2FpFnpF/lWzokSED2Oa/5lU+VYMmzClNMxogkQOnz45zUiTNQTWi2THs FxnkSoknxx2W+kf2x31FJgEmodAuTwBW+4F6QvFOJPARIdxuMt25jlGwaBp+9El4+M pz5biGZ6W3XHg== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id B2FB7C41614; Wed, 24 Dec 2025 21:41:06 +0000 (UTC) From: bugzilla-daemon@kernel.org To: dri-devel@lists.freedesktop.org Subject: [Bug 220906] New: Regression: 4K display output fails on ThinkPad Thunderbolt 4 Dock with AMD GPU (Worked in 6.17.1, broken in 6.17.11) Date: Wed, 24 Dec 2025 21:41:06 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: AssignedTo drivers_video-dri@kernel-bugs.osdl.org X-Bugzilla-Product: Drivers X-Bugzilla-Component: Video(DRI - non Intel) X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: danandrei@gmail.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: drivers_video-dri@kernel-bugs.osdl.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter cf_regression attachments.created Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" https://bugzilla.kernel.org/show_bug.cgi?id=3D220906 Bug ID: 220906 Summary: Regression: 4K display output fails on ThinkPad Thunderbolt 4 Dock with AMD GPU (Worked in 6.17.1, broken in 6.17.11) Product: Drivers Version: 2.5 Hardware: AMD OS: Linux Status: NEW Severity: normal Priority: P3 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@kernel-bugs.osdl.org Reporter: danandrei@gmail.com Regression: No Created attachment 309076 --> https://bugzilla.kernel.org/attachment.cgi?id=3D309076&action=3Dedit dmesg boot output for 6.17.1 & 6.17.12 A regression in recent kernels prevents 4K output over a ThinkPad Thunderbo= lt 4 Dock when using amdgpu. After upgrading to kernel 6.17.11=E2=80=91300.fc43.x86_64 on a Lenovo T14s = Gen 6 (AMD), my 4K external monitor connected through a ThinkPad Thunderbolt 4 Dock no longer works at 4K resolution. The display only shows output at lower resolutions, and even those modes are effectively unusable. This is a regression: the same hardware setup works correctly on kernel 6.17.1=E2=80=91300.fc43.x86_64, including the version shipped with Fedora=E2=80=91KDE=E2=80=91Desktop=E2=80=91Live=E2=80=9143=E2=80=911.6.x86_= 64.iso. Booting back into 6.17.1 restores full 4K functionality. The issue is fully reproducible by using the affected kernel versions with = this hardware combination. No out=E2=80=91of=E2=80=91tree modules are installed;= this is a fresh Fedora installation. I also tested the latest Rawhide kernel (6.18 branch), and the problem pers= ists there as well. When attempting to switch the display to 4K, the kernel logs repeatedly show the following amdgpu messages: ``` journalctl -f | grep -i 'amdgpu' Dec 14 22:37:37 GOTO kernel: amdgpu 0000:c3:00.0: amdgpu: [drm] DMUB HPD RX= IRQ callback: link_index=3D5 Dec 14 22:37:37 GOTO kernel: amdgpu 0000:c3:00.0: amdgpu: [drm] DMUB HPD RX= IRQ callback: link_index=3D5 Dec 14 22:37:37 GOTO kernel: amdgpu 0000:c3:00.0: amdgpu: [drm] DMUB HPD RX= IRQ callback: link_index=3D5 Dec 14 22:37:37 GOTO kernel: amdgpu 0000:c3:00.0: amdgpu: [drm] DMUB HPD RX= IRQ callback: link_index=3D5 Dec 14 22:37:37 GOTO kernel: amdgpu 0000:c3:00.0: amdgpu: [drm] DMUB HPD RX= IRQ callback: link_index=3D5 Dec 14 22:37:37 GOTO kernel: amdgpu 0000:c3:00.0: amdgpu: [drm] DMUB HPD RX= IRQ callback: link_index=3D5 Dec 14 22:37:37 GOTO kernel: amdgpu 0000:c3:00.0: amdgpu: [drm] DMUB HPD RX= IRQ callback: link_index=3D5 Dec 14 22:37:37 GOTO kernel: amdgpu 0000:c3:00.0: amdgpu: [drm] DMUB HPD RX= IRQ callback: link_index=3D5 Dec 14 22:37:37 GOTO kernel: amdgpu 0000:c3:00.0: amdgpu: [drm] DMUB HPD RX= IRQ callback: link_index=3D5 Dec 14 22:37:37 GOTO kernel: amdgpu 0000:c3:00.0: amdgpu: [drm] DMUB HPD RX= IRQ callback: link_index=3D5 Dec 14 22:37:38 GOTO kernel: amdgpu 0000:c3:00.0: amdgpu: [drm] DMUB HPD RX= IRQ callback: link_index=3D5 Dec 14 22:37:53 GOTO kernel: amdgpu 0000:c3:00.0: amdgpu: [drm] DMUB HPD RX= IRQ callback: link_index=3D5 Dec 14 22:37:53 GOTO kernel: amdgpu 0000:c3:00.0: amdgpu: [drm] DMUB HPD RX= IRQ callback: link_index=3D5 ``` I noticed that Bug 219748 (Pluggable UD=E2=80=914VPD dock resetting on AMD = hardware) shows the same repeated [drm] DMUB HPD RX IRQ callback messages. The hardwa= re is similar and also involves a USB=E2=80=91C/Thunderbolt dock, so this may = be related. --=20 You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.=