Public bug reported:
System:
- Kubuntu 24.04.3 LTS (Kernel: 6.14.0-1015-oem)
- Acer Swift SF314-510G (BIOS V1.13)
- Intel i5-1135G7, Iris Xe (TGL GT2), DG1 (Iris Xe MAX)
- Dock: Hagibis Thunderbolt 100W USB-C
- Ethernet (Realtek RTL8156, driver r8152)
- Display connected via dock (DisplayPort Alt Mode)
Problem:
- External display flickers or briefly loses signal.
- Ethernet interface (r8152) drops connection periodically.
- Dock re-enumerates as new USB devices every few minutes.
dmesg excerpts:
ucsi_acpi USBC000:00: con1: Firmware bug: duplicate plug altmode SVID 0x8087
ucsi_acpi USBC000:00: failed to reset PPM!
r8152 2-1.4:1.0 enx00e04c680051: Tx status -71
usb 2-1: USB disconnect / reconnect loop (GenesysLogic + Realtek hub)
Reproduction:
1. Connect Hagibis Thunderbolt dock via USB-C.
2. Attach monitor and Ethernet cable to dock.
3. After ~10–30 minutes, display flickers and Ethernet reconnects.
4. Same hardware is stable on Windows 11.
Analysis:
- UCSI ACPI PD controller loses sync, causing Type-C re-enumeration.
- When PD renegotiates, all downstream USB devices reset.
- i915 + ucsi_acpi + r8152 interaction likely root cause.
- BIOS and Thunderbolt firmware already up to date.
Workarounds tested:
- i915.enable_psr=0 i915.enable_fbc=0 i915.enable_dc=0 → partial improvement
- usbcore.autosuspend=-1 → reduces frequency
- r8152 disable_pll_power_down=1 → stabilizes Ethernet
- Direct HDMI (no dock) → stable
Expected:
Stable display and Ethernet when docked.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.14.0-1015-oem 6.14.0-1015.15
ProcVersionSignature: Ubuntu 6.14.0-1015.15-oem 6.14.11
Uname: Linux 6.14.0-1015-oem x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: muthi 2205 F.... wireplumber
/dev/snd/controlC0: muthi 2205 F.... wireplumber
/dev/snd/seq: muthi 2203 F.... pipewire
CRDA: N/A
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Thu Oct 30 20:09:09 2025
InstallationDate: Installed on 2025-10-27 (3 days ago)
InstallationMedia: Kubuntu 24.04.3 LTS "Noble Numbat" - Release amd64
(20250805.1)
MachineType: Acer Swift SF314-510G
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.14.0-1015-oem
root=UUID=f44d5586-9aa3-4b44-943f-eac9451e5525 ro quiet splash
intel_iommu=igfx_off vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-6.14.0-1015-oem N/A
linux-backports-modules-6.14.0-1015-oem N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.19
SourcePackage: linux-oem-6.14
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/28/2022
dmi.bios.release: 1.13
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V1.13
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: Brahma_TL
dmi.board.vendor: TGL
dmi.board.version: V1.13
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: Chassis Version
dmi.ec.firmware.release: 1.13
dmi.modalias:
dmi:bvnInsydeCorp.:bvrV1.13:bd10/28/2022:br1.13:efr1.13:svnAcer:pnSwiftSF314-510G:pvrV1.13:rvnTGL:rnBrahma_TL:rvrV1.13:cvnAcer:ct10:cvrChassisVersion:sku0000000000000000:
dmi.product.family: Swift 3X
dmi.product.name: Swift SF314-510G
dmi.product.sku: 0000000000000000
dmi.product.version: V1.13
dmi.sys.vendor: Acer
all this information writed with help of chatgpt
** Affects: linux-oem-6.14 (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
System:
- Kubuntu 24.04.3 LTS (Kernel: 6.14.0-1015-oem)
- Acer Swift SF314-510G (BIOS V1.13)
- Intel i5-1135G7, Iris Xe (TGL GT2), DG1 (Iris Xe MAX)
- Dock: Hagibis Thunderbolt 100W USB-C
- Ethernet (Realtek RTL8156, driver r8152)
- Display connected via dock (DisplayPort Alt Mode)
Problem:
- External display flickers or briefly loses signal.
- Ethernet interface (r8152) drops connection periodically.
- Dock re-enumerates as new USB devices every few minutes.
dmesg excerpts:
ucsi_acpi USBC000:00: con1: Firmware bug: duplicate plug altmode SVID 0x8087
ucsi_acpi USBC000:00: failed to reset PPM!
r8152 2-1.4:1.0 enx00e04c680051: Tx status -71
usb 2-1: USB disconnect / reconnect loop (GenesysLogic + Realtek hub)
Reproduction:
1. Connect Hagibis Thunderbolt dock via USB-C.
2. Attach monitor and Ethernet cable to dock.
3. After ~10–30 minutes, display flickers and Ethernet reconnects.
4. Same hardware is stable on Windows 11.
Analysis:
- UCSI ACPI PD controller loses sync, causing Type-C re-enumeration.
- When PD renegotiates, all downstream USB devices reset.
- i915 + ucsi_acpi + r8152 interaction likely root cause.
- BIOS and Thunderbolt firmware already up to date.
Workarounds tested:
- i915.enable_psr=0 i915.enable_fbc=0 i915.enable_dc=0 → partial improvement
- usbcore.autosuspend=-1 → reduces frequency
- r8152 disable_pll_power_down=1 → stabilizes Ethernet
- Direct HDMI (no dock) → stable
Expected:
Stable display and Ethernet when docked.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.14.0-1015-oem 6.14.0-1015.15
ProcVersionSignature: Ubuntu 6.14.0-1015.15-oem 6.14.11
Uname: Linux 6.14.0-1015-oem x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
AudioDevicesInUse:
- USER PID ACCESS COMMAND
- /dev/snd/controlC1: muthi 2205 F.... wireplumber
- /dev/snd/controlC0: muthi 2205 F.... wireplumber
- /dev/snd/seq: muthi 2203 F.... pipewire
+ USER PID ACCESS COMMAND
+ /dev/snd/controlC1: muthi 2205 F.... wireplumber
+ /dev/snd/controlC0: muthi 2205 F.... wireplumber
+ /dev/snd/seq: muthi 2203 F.... pipewire
CRDA: N/A
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Thu Oct 30 20:09:09 2025
InstallationDate: Installed on 2025-10-27 (3 days ago)
InstallationMedia: Kubuntu 24.04.3 LTS "Noble Numbat" - Release amd64
(20250805.1)
MachineType: Acer Swift SF314-510G
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.14.0-1015-oem
root=UUID=f44d5586-9aa3-4b44-943f-eac9451e5525 ro quiet splash
intel_iommu=igfx_off vt.handoff=7
RelatedPackageVersions:
- linux-restricted-modules-6.14.0-1015-oem N/A
- linux-backports-modules-6.14.0-1015-oem N/A
- linux-firmware 20240318.git3b128b60-0ubuntu2.19
+ linux-restricted-modules-6.14.0-1015-oem N/A
+ linux-backports-modules-6.14.0-1015-oem N/A
+ linux-firmware 20240318.git3b128b60-0ubuntu2.19
SourcePackage: linux-oem-6.14
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/28/2022
dmi.bios.release: 1.13
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V1.13
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: Brahma_TL
dmi.board.vendor: TGL
dmi.board.version: V1.13
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: Chassis Version
dmi.ec.firmware.release: 1.13
dmi.modalias:
dmi:bvnInsydeCorp.:bvrV1.13:bd10/28/2022:br1.13:efr1.13:svnAcer:pnSwiftSF314-510G:pvrV1.13:rvnTGL:rnBrahma_TL:rvrV1.13:cvnAcer:ct10:cvrChassisVersion:sku0000000000000000:
dmi.product.family: Swift 3X
dmi.product.name: Swift SF314-510G
dmi.product.sku: 0000000000000000
dmi.product.version: V1.13
dmi.sys.vendor: Acer
+
+ all this information writed with help of chatgpt
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https://bugs.launchpad.net/bugs/2130329
Title:
Display flicker and Ethernet disconnect via Hagibis Thunderbolt dock
(UCSI/PD instability)
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