** Changed in: linux (Ubuntu Jammy)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/2115238
Title:
dmesg flooded with errors: amdgpu: DP AUX transfer fail:4
Status in HWE Next:
New
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem-6.11 package in Ubuntu:
Invalid
Status in linux-oem-6.14 package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Fix Committed
Status in linux-oem-6.11 source package in Jammy:
Invalid
Status in linux-oem-6.14 source package in Jammy:
Invalid
Status in linux source package in Noble:
Deferred
Status in linux-oem-6.11 source package in Noble:
Fix Released
Status in linux-oem-6.14 source package in Noble:
Fix Released
Status in linux source package in Oracular:
Deferred
Status in linux-oem-6.11 source package in Oracular:
Invalid
Status in linux-oem-6.14 source package in Oracular:
Invalid
Status in linux source package in Plucky:
Deferred
Status in linux-oem-6.11 source package in Plucky:
Invalid
Status in linux-oem-6.14 source package in Plucky:
Invalid
Status in linux source package in Questing:
Fix Released
Status in linux-oem-6.11 source package in Questing:
Invalid
Status in linux-oem-6.14 source package in Questing:
Invalid
Bug description:
[ SRU Justification ]
[ Impact ]
v6.15-rc6 commit 65924ec69b292 ("drm/amd/display: Fix wrong handling
for AUX_DEFER case") added a `drm_info()` call to notify a failed
transaction, and that may flood kernel dmesg buffer. This was then
fixed by another v6.15-rc7 commit d33724ffb743d ("drm/amd/display:
Avoid flooding unnecessary info messages").
The former was also backported to v6.14.7, v6.12.29, v6.6.91,
v6.1.139, v5.15.183.
The later to v6.14.8, v6.12.30, v6.6.92, v6.1.140.
linux-6.14/plucky version 6.14.0-24.24 has v6.14.6, not yet affected,
linux-6.11/oracular master-next has v6.6.88, v6.12.25, not yet affected,
linux-6.8/noble version 6.8.0-64.67 has v6.6.77, v6.12.14, not yet affected,
linux-5.15/jammy version 5.15.0-144.157 has v5.15.184, affected and the
solution is not (yet?) backported to stable tree.
linux-oem-6.14/noble version 6.14.0-1005.5 has the former through bug 2110095,
linux-oem-6.11/noble version 6.11.0-1024.24 has the former through bug 2110095
[ Test Plan ]
The fix reduce log level from `drm_info()` to `drm_dbg_dp()`, so it
shall stop to appear by default.
Following messages flood kernel dmesg buffer after some GPU testing
operations if reproduced:
```
$ sudo dmesg|grep 'DP AUX transfer'
...
amdgpu 0000:c4:00.0: amdgpu: [drm] amdgpu: DP AUX transfer fail:4
$ sudo dmesg|grep 'DP AUX transfer' | wc -l
896
```
[ Where problems could occur ]
Lower debug message level only.
[ Other Info ]
Nominate for oem-6.11, oem-6.14 and linux/jammy so far. For N/O/P,
they should have both the cause and the fix at the same time if there
is a next stable backport for them.
========== original bug report ==========
Following messages flood kernel dmesg buffer after some GPU testing
operations:
```
$ sudo dmesg|grep 'DP AUX transfer'
...
amdgpu 0000:c4:00.0: amdgpu: [drm] amdgpu: DP AUX transfer fail:4
$ sudo dmesg|grep 'DP AUX transfer' | wc -l
896
```
Proposed fix:
https://github.com/torvalds/linux/commit/d33724ffb743d3d2698bd969e29253ae0cff9739
---
ProblemType: Bug
ApportVersion: 2.28.1-0ubuntu3.6
Architecture: amd64
CasperMD5CheckMismatches: ./casper/initrd ./casper/vmlinuz
./casper/minimal.standard.live.hotfix.manifest
./casper/minimal.standard.live.hotfix.size ./casper/minimal.standard.live.size
./casper/minimal.manifest ./casper/minimal.standard.manifest
./casper/minimal.standard.size ./casper/minimal.hotfix.size
./casper/minimal.standard.live.hotfix.squashfs
./casper/minimal.standard.hotfix.squashfs ./casper/minimal.standard.hotfix.size
./casper/minimal.standard.hotfix.manifest ./casper/minimal.hotfix.squashfs
./casper/minimal.standard.live.manifest ./casper/minimal.size
./boot/grub/grub.cfg
CasperMD5CheckResult: fail
DistributionChannelDescriptor:
# This is the distribution channel descriptor for Ubuntu 24.04 for HP
# For more information see
http://wiki.ubuntu.com/DistributionChannelDescriptor
canonical-oem-stella-noble-oem-24.04b-proposed-20250605-516
DistroRelease: Ubuntu 24.04
InstallationDate: Installed on 2025-06-18 (6 days ago)
InstallationMedia: Ubuntu OEM 24.04.2 LTS "Noble Numbat" - Release amd64
(20250603)
MachineType: HP HP ZBook 8 G1as 14 inch Mobile Workstation PC
Package: linux-oem-6.14 (not installed)
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.14.0-1005-oem
root=UUID=d200ca7e-1ea4-4778-b598-f41d7f67f288 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 6.14.0-1005.5-oem 6.14.5
RelatedPackageVersions:
linux-restricted-modules-6.14.0-1005-oem N/A
linux-backports-modules-6.14.0-1005-oem N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.14
Tags: noble
Uname: Linux 6.14.0-1005-oem x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: N/A
_MarkForUpload: True
dmi.bios.date: 04/23/2025
dmi.bios.release: 1.4
dmi.bios.vendor: HP
dmi.bios.version: X84 Ver. 01.01.04
dmi.board.name: 8E1A
dmi.board.vendor: HP
dmi.board.version: KBC Version 54.22.00
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.ec.firmware.release: 84.34
dmi.modalias:
dmi:bvnHP:bvrX84Ver.01.01.04:bd04/23/2025:br1.4:efr84.34:svnHP:pnHPZBook8G1as14inchMobileWorkstationPC:pvrSBKPF,SBKPFV2:rvnHP:rn8E1A:rvrKBCVersion54.22.00:cvnHP:ct10:cvr:sku1234567#ABA:
dmi.product.family: 103C_5336AN HP ZBook
dmi.product.name: HP ZBook 8 G1as 14 inch Mobile Workstation PC
dmi.product.sku: 1234567#ABA
dmi.product.version: SBKPF,SBKPFV2
dmi.sys.vendor: HP
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