This seemed the closest category to the issue I am having. I’m looking for an RMA for my DGX Spark due to a NIC throttling to 100Mbps.
• DGX Spark purchased March 31, 2026 from Micro Center (fulfilled by Amazon)
• Original owner
• RTL8127 NIC advertised as 10GbE, but fails to maintain link above 100 Mbps with auto-negotiation
• Stable at 1 Gbps forced, drops at 2.5 Gbps forced
• Tested with multiple switches, cables, and ports—problem follows NIC
• Cat6a cable verified at 10G with other devices
• Running latest software/firmware
• NVIDIA DGX Spark Field Diagnostics tool reports PASS for all tests (logs on request; too large to attach
• Customer requests escalation to live agent for further review (who referred me here)
This is either a hardware issue with the NIC or a firmware/software issue with the DGX Spark, which is fully patched to the latest versions.
sudo dmidecode -s system-product-name
uname -a
1984225002774
NVIDIA_DGX_Spark
Linux sparky 6.17.0-1018-nvidia #18-Ubuntu SMP PREEMPT_DYNAMIC Tue May 5 21:28:33 UTC 2026 aarch64 aarch64 aarch64 GNU/Linux
sudo lspci -vvv -s $(lspci | grep -i realtek | awk ‘{print $1}’)
sudo ethtool -i
sudo modinfo r8127
0007:01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. Device 8127 (rev 05)
Subsystem: Realtek Semiconductor Co., Ltd. Device 0123
Physical Slot: 7
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 333
IOMMU group: 15
Region 0: I/O ports at 30000 [size=256]
Region 2: Memory at 6e900000 (64-bit, non-prefetchable) [size=256K]
Region 4: Memory at 6e940000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [40] Power Management version 3
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
Address: 0000000000000000 Data: 0000
Capabilities: [70] Express (v2) Endpoint, MSI 01
DevCap: MaxPayload 512 bytes, PhantFunc 0, Latency L0s <512ns, L1 <64us
ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset- SlotPowerLimit 0W
DevCtl: CorrErr+ NonFatalErr+ FatalErr+ UnsupReq+
RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 512 bytes, MaxReadReq 256 bytes
DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq+ AuxPwr+ TransPend-
LnkCap: Port #0, Speed 16GT/s, Width x1, ASPM L0s L1, Exit Latency L0s unlimited, L1 <64us
ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 16GT/s, Width x1
TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Range ABCD, TimeoutDis+ NROPrPrP- LTR+
10BitTagComp+ 10BitTagReq- OBFF Via message/WAKE#, ExtFmt- EETLPPrefix-
EmergencyPowerReduction Not Supported, EmergencyPowerReductionInit-
FRS- TPHComp+ ExtTPHComp-
AtomicOpsCap: 32bit- 64bit- 128bitCAS-
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LTR+ 10BitTagReq- OBFF Disabled,
AtomicOpsCtl: ReqEn-
LnkCap2: Supported Link Speeds: 2.5-16GT/s, Crosslink- Retimer+ 2Retimers+ DRS-
LnkCtl2: Target Link Speed: 16GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
Compliance Preset/De-emphasis: -6dB de-emphasis, 0dB preshoot
LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete+ EqualizationPhase1+
EqualizationPhase2+ EqualizationPhase3+ LinkEqualizationRequest-
Retimer- 2Retimers- CrosslinkRes: Upstream Port
Capabilities: [b0] MSI-X: Enable+ Count=64 Masked-
Vector table: BAR=4 offset=00000000
PBA: BAR=4 offset=00000800
Capabilities: [d0] Vital Product Data
pcilib: sysfs_read_vpd: read failed: No such device
Not readable
Capabilities: [100 v2] Advanced Error Reporting
UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq+ ACSViol-
UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- AdvNonFatalErr-
CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- AdvNonFatalErr+
AERCap: First Error Pointer: 00, ECRCGenCap+ ECRCGenEn- ECRCChkCap+ ECRCChkEn-
MultHdrRecCap- MultHdrRecEn- TLPPfxPres- HdrLogCap-
HeaderLog: 00000000 00000000 00000000 00000000
Capabilities: [148 v1] Virtual Channel
Caps: LPEVC=0 RefClk=100ns PATEntryBits=1
Arb: Fixed- WRR32- WRR64- WRR128-
Ctrl: ArbSelect=Fixed
Status: InProgress-
VC0: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
Arb: Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
Ctrl: Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
Status: NegoPending- InProgress-
Capabilities: [164 v1] Device Serial Number 01-00-00-00-68-4c-e0-00
Capabilities: [174 v1] Secondary PCI Express
LnkCtl3: LnkEquIntrruptEn- PerformEqu-
LaneErrStat: 0
Capabilities: [184 v1] Physical Layer 16.0 GT/s
Capabilities: [244 v1] Latency Tolerance Reporting
Max snoop latency: 0ns
Max no snoop latency: 0ns
Capabilities: [24c v1] L1 PM Substates
L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+
PortCommonModeRestoreTime=150us PortTPowerOnTime=150us
L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1-
T_CommonMode=0us LTR1.2_Threshold=0ns
L1SubCtl2: T_PwrOn=10us
Capabilities: [25c v1] Data Link Feature
Kernel driver in use: r8127
Kernel modules: r8127
/lib/modules/6.17.0-1018-nvidia/kernel/drivers/net/ethernet/realtek/r8127/r8127.ko.zst
version: 11.014.00-NAPI
license: GPL
description: Realtek r8127 Ethernet controller driver
author: Realtek and the Linux r8127 crew netdev@vger.kernel.org
srcversion: B8CE8DB6A21E011635749E6
alias: pci:v000010ECd00000E10svsdbcsci*
alias: pci:v000010ECd00008127svsdbcsci*
depends:
intree: Y
name: r8127
vermagic: 6.17.0-1018-nvidia SMP preempt mod_unload modversions aarch64
sig_id: PKCS#7
signer: Build time autogenerated kernel key
sig_key: 30:E3:2E:8C:2F:D0:29:C7:8D:CB:53:45:1A:10:93:4E:F6:C6:F2:70
sig_hashalgo: sha512
signature: 2B:0F:A2:D0:CD:85:F5:55:0E:1F:44:AF:89:DA:BB:3A:D7:5B:F6:C9:
8D:30:08:09:F9:FF:16:FC:36:38:78:06:2D:F9:82:1B:2D:50:A1:A3:
6D:31:0D:EC:80:D7:1F:8C:E4:32:52:FB:B6:D1:22:CD:51:9A:AF:E5:
7F:31:D4:D9:93:0B:67:FB:CD:1C:A3:B5:1E:7E:42:A8:86:BB:FC:6D:
65:F7:4D:55:70:F3:41:01:54:18:FA:80:0D:3E:E9:6E:DB:A9:CA:6A:
6B:B7:11:83:8D:AD:11:19:22:B8:6B:C9:0E:38:20:BF:22:E4:DE:FD:
CD:91:78:21:C3:90:3A:A4:74:57:36:A4:99:F2:8F:AD:76:FE:20:BD:
0A:DA:BA:B8:A9:1F:C9:7E:0E:54:D4:69:02:EF:72:E7:1E:83:54:E7:
B7:C5:FE:1C:EC:80:EA:67:93:A6:46:75:D0:E5:6A:0A:0A:F4:CC:B3:
AE:41:3E:46:6A:2B:27:B8:0A:38:AE:9E:5E:60:7A:57:86:17:93:5E:
5C:C8:C9:D0:B1:D0:0E:4D:DB:35:95:B4:A9:E4:18:E7:E5:21:69:38:
2C:BE:DC:7B:FB:B8:1B:59:79:68:72:1D:EC:3E:72:C2:FC:74:74:B9:
E9:19:8B:8D:8F:D4:72:20:3D:80:5D:58:A7:BB:2E:DD:EB:2A:06:02:
50:DE:FB:93:49:D5:B4:09:FD:09:79:C9:99:F5:E1:60:9B:3D:86:41:
1B:AC:1C:48:BE:8B:55:01:8B:2C:E3:39:B7:F7:CB:91:45:0D:3E:87:
B9:68:60:9C:C2:7F:E9:85:DA:75:60:1A:48:22:EF:7A:67:B7:4B:4C:
3C:4C:7F:BB:4A:6D:A3:B4:F8:58:B7:C3:65:DD:FA:05:E9:E3:45:1C:
43:9A:82:53:28:4A:0D:3F:9E:BA:C6:58:7F:ED:8F:2D:12:10:57:BB:
CB:26:00:F0:C8:B8:57:AE:DC:CD:6E:3B:8D:82:69:BE:7A:28:7B:A9:
C9:FD:83:A4:86:5C:DE:9A:E1:8D:32:CB:7E:5C:7A:11:B9:4E:0D:AE:
67:17:5E:01:93:65:CA:7F:6C:FC:FA:38:39:0A:FF:4E:DB:81:6A:FF:
12:18:FD:47:26:7C:0C:36:9F:8F:02:19:A2:C8:ED:E8:A8:C4:E8:32:
C6:35:35:91:52:29:3B:0E:E2:14:AF:2F:13:73:62:BC:9C:E1:34:71:
18:AA:B3:B5:A6:19:EC:66:43:B0:4C:0A:B4:A6:9B:55:2D:A2:92:90:
ED:CA:5D:DE:95:A3:88:37:FE:91:C1:05:AA:84:8E:4D:FB:B9:B6:B7:
1F:3E:CB:58:63:9C:E1:D8:67:EA:8F:25
parm: speed_mode:force phy operation. Deprecated by ethtool (8). (uint)
parm: duplex_mode:force phy operation. Deprecated by ethtool (8). (uint)
parm: autoneg_mode:force phy operation. Deprecated by ethtool (8). (uint)
parm: aspm:Enable ASPM. (int)
parm: s5wol:Enable Shutdown Wake On Lan. (int)
parm: s5_keep_curr_mac:Enable Shutdown Keep Current MAC Address. (int)
parm: use_dac:Enable PCI DAC. Unsafe on 32 bit PCI slot. (int)
parm: timer_count:Timer Interrupt Interval. (int)
parm: eee_enable:Enable Energy Efficient Ethernet. (int)
parm: hwoptimize:Enable HW optimization function. (ulong)
parm: s0_magic_packet:Enable S0 Magic Packet. (int)
parm: tx_no_close_enable:Enable TX No Close. (int)
parm: disable_wol_support:Disable PM support. (int)
parm: enable_double_vlan:Enable Double VLAN. (int)
parm: eee_giga_lite:Enable Giga Lite. (int)
parm: debug:Debug verbosity level (0=none, …, 16=all) (int)
olly@sparky:/etc$ sudo ethtool enP7s7
Settings for enP7s7:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
10000baseT/Full
2500baseT/Full
5000baseT/Full
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
10000baseT/Full
2500baseT/Full
5000baseT/Full
Advertised pause frame use: Symmetric Receive-only
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Link partner advertised link modes: 100baseT/Half 100baseT/Full
1000baseT/Full
10000baseT/Full
2500baseT/Full
5000baseT/Full
Link partner advertised pause frame use: Symmetric Receive-only
Link partner advertised auto-negotiation: Yes
Link partner advertised FEC modes: Not reported
Speed: 100Mb/s
Duplex: Full
Auto-negotiation: on
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
MDI-X: on
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000033 (51)
drv probe ifdown ifup
Link detected: yes
sudo ethtool --show-features enP7s7
Features for enP7s7:
rx-checksumming: on
tx-checksumming: on
tx-checksum-ipv4: on
tx-checksum-ip-generic: off [fixed]
tx-checksum-ipv6: on
tx-checksum-fcoe-crc: off [fixed]
tx-checksum-sctp: off [fixed]
scatter-gather: on
tx-scatter-gather: on
tx-scatter-gather-fraglist: off [fixed]
tcp-segmentation-offload: on
tx-tcp-segmentation: on
tx-tcp-ecn-segmentation: off [fixed]
tx-tcp-mangleid-segmentation: off
tx-tcp6-segmentation: on
tx-tcp-accecn-segmentation: off [fixed]
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off [fixed]
rx-vlan-offload: on
tx-vlan-offload: on
ntuple-filters: off [fixed]
receive-hashing: off [fixed]
highdma: on [fixed]
rx-vlan-filter: off [fixed]
vlan-challenged: off [fixed]
tx-gso-robust: off [fixed]
tx-fcoe-segmentation: off [fixed]
tx-gre-segmentation: off [fixed]
tx-gre-csum-segmentation: off [fixed]
tx-ipxip4-segmentation: off [fixed]
tx-ipxip6-segmentation: off [fixed]
tx-udp_tnl-segmentation: off [fixed]
tx-udp_tnl-csum-segmentation: off [fixed]
tx-gso-partial: off [fixed]
tx-tunnel-remcsum-segmentation: off [fixed]
tx-sctp-segmentation: off [fixed]
tx-esp-segmentation: off [fixed]
tx-udp-segmentation: off [fixed]
tx-gso-list: off [fixed]
tx-nocache-copy: off
loopback: off [fixed]
rx-fcs: off
rx-all: off
tx-vlan-stag-hw-insert: off [fixed]
rx-vlan-stag-hw-parse: off [fixed]
rx-vlan-stag-filter: off [fixed]
l2-fwd-offload: off [fixed]
hw-tc-offload: off [fixed]
esp-hw-offload: off [fixed]
esp-tx-csum-hw-offload: off [fixed]
rx-udp_tunnel-port-offload: off [fixed]
tls-hw-tx-offload: off [fixed]
tls-hw-rx-offload: off [fixed]
rx-gro-hw: off [fixed]
tls-hw-record: off [fixed]
rx-gro-list: off
macsec-hw-offload: off [fixed]
rx-udp-gro-forwarding: off
hsr-tag-ins-offload: off [fixed]
hsr-tag-rm-offload: off [fixed]
hsr-fwd-offload: off [fixed]
hsr-dup-offload: off [fixed]
sudo dmesg | grep -iE “r8127|eth|link” | tail -50
[ 0.000000] psci: probing for conduit method from ACPI.
[ 0.040302] NET: Registered PF_NETLINK/PF_ROUTE protocol family
[ 0.042223] audit: initializing netlink subsys (disabled)
[ 0.109966] pci 000f:01:00.0: 0.000 Gb/s available PCIe bandwidth, limited by Unknown x0 link at 000f:00:00.0 (capable of 32.000 Gb/s with 2.5 GT/s PCIe x16 link)
[ 1.120038] r8127 Ethernet controller driver 11.014.00-NAPI loaded
[ 1.129570] r8127: This product is covered by one or more of the following patents: US6,570,884, US6,115,776, and US6,327,625.
[ 1.129597] r8127 Copyright (C) 2025 Realtek NIC software team nicfae@realtek.com
[ 1.179745] r8127 0007:01:00.0 enP7s7: renamed from eth0
[ 1.184836] mlx5_core 0000:01:00.0: 126.028 Gb/s available PCIe bandwidth (32.0 GT/s PCIe x4 link)
[ 1.760777] mlx5_core 0000:01:00.1: 126.028 Gb/s available PCIe bandwidth (32.0 GT/s PCIe x4 link)
[ 2.322804] mlx5_core 0002:01:00.0: 126.028 Gb/s available PCIe bandwidth (32.0 GT/s PCIe x4 link)
[ 2.926564] mlx5_core 0002:01:00.1: 126.028 Gb/s available PCIe bandwidth (32.0 GT/s PCIe x4 link)
[ 3.482390] mlx5_core 0000:01:00.1 enp1s0f1np1: renamed from eth1
[ 3.483548] mlx5_core 0002:01:00.0 enP2p1s0f0np0: renamed from eth2
[ 3.483862] mlx5_core 0000:01:00.0 enp1s0f0np0: renamed from eth0
[ 3.484135] mlx5_core 0002:01:00.1 enP2p1s0f1np1: renamed from eth3
[ 4.684846] systemd[1]: Listening on systemd-networkd.socket - Network Service Netlink Socket.
[ 4.684889] systemd[1]: systemd-pcrextend.socket - TPM2 PCR Extension (Varlink) was skipped because of an unmet condition check (ConditionSecurity=measured-uki).
[ 5.255765] nvidia-nvlink: Nvlink Core is being initialized, major device number 499
[ 5.918104] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 6.567645] mlx5_core 0002:01:00.0 enP2p1s0f0np0: Link down
[ 6.862474] mlx5_core 0002:01:00.1 enP2p1s0f1np1: Link down
[ 9.455952] mlx5_core 0000:01:00.1 enp1s0f1np1: Link down
[ 10.685665] Initializing XFRM netlink socket
[ 13.519847] r8127: enP7s7: link up
[ 13.525902] r8127: enP7s7: link down
[ 20.163859] r8127: enP7s7: link up
[ 35.776057] audit: type=1400 audit(1779908583.912:176): apparmor=“DENIED” operation=“unlink” class=“file” profile=“snap.snapd-desktop-integration.snapd-desktop-integration” name=“/dev/char/195:255” pid=9869 comm=“snapd-desktop-i” requested_mask=“d” denied_mask=“d” fsuid=1000 ouid=0
[ 35.778293] audit: type=1400 audit(1779908583.914:177): apparmor=“DENIED” operation=“unlink” class=“file” profile=“snap.snapd-desktop-integration.snapd-desktop-integration” name=“/dev/char/195:0” pid=9869 comm=“snapd-desktop-i” requested_mask=“d” denied_mask=“d” fsuid=1000 ouid=0
[ 35.778349] audit: type=1400 audit(1779908583.914:178): apparmor=“DENIED” operation=“unlink” class=“file” profile=“snap.snapd-desktop-integration.snapd-desktop-integration” name=“/dev/char/195:0” pid=9869 comm=“snapd-desktop-i” requested_mask=“d” denied_mask=“d” fsuid=1000 ouid=0
[ 35.779815] audit: type=1400 audit(1779908583.915:179): apparmor=“DENIED” operation=“unlink” class=“file” profile=“snap.snapd-desktop-integration.snapd-desktop-integration” name=“/dev/char/195:0” pid=9869 comm=“snapd-desktop-i” requested_mask=“d” denied_mask=“d” fsuid=1000 ouid=0
[ 35.796904] audit: type=1400 audit(1779908583.932:180): apparmor=“DENIED” operation=“unlink” class=“file” profile=“snap.snapd-desktop-integration.snapd-desktop-integration” name=“/dev/char/195:255” pid=9869 comm=“snapd-desktop-i” requested_mask=“d” denied_mask=“d” fsuid=1000 ouid=0
[ 35.797051] audit: type=1400 audit(1779908583.933:181): apparmor=“DENIED” operation=“unlink” class=“file” profile=“snap.snapd-desktop-integration.snapd-desktop-integration” name=“/dev/char/195:254” pid=9869 comm=“snapd-desktop-i” requested_mask=“d” denied_mask=“d” fsuid=1000 ouid=0
[ 35.797244] audit: type=1400 audit(1779908583.933:182): apparmor=“DENIED” operation=“unlink” class=“file” profile=“snap.snapd-desktop-integration.snapd-desktop-integration” name=“/dev/char/195:0” pid=9869 comm=“snapd-desktop-i” requested_mask=“d” denied_mask=“d” fsuid=1000 ouid=0
[ 35.798746] audit: type=1400 audit(1779908583.934:183): apparmor=“DENIED” operation=“unlink” class=“file” profile=“snap.snapd-desktop-integration.snapd-desktop-integration” name=“/dev/char/195:0” pid=9869 comm=“snapd-desktop-i” requested_mask=“d” denied_mask=“d” fsuid=1000 ouid=0
[ 35.805004] audit: type=1107 audit(1779908583.941:184): pid=1580 uid=101 auid=4294967295 ses=4294967295 subj=unconfined msg='apparmor=“DENIED” operation=“dbus_method_call” bus=“system” path=“/org/freedesktop/DBus” interface=“org.freedesktop.DBus” member=“ListNames” mask=“send” name=“org.freedesktop.DBus” pid=9869 label=“snap.snapd-desktop-integration.snapd-desktop-integration” peer_label=“unconfined”
[ 1044.479883] nvidia-nvlink: Unregistered Nvlink Core, major device number 499
[ 3615.023537] nvidia-nvlink: Nvlink Core is being initialized, major device number 499
[13465.691220] r8127 0007:01:00.0: invalid VPD tag 0x00 (size 0) at offset 0; assume missing optional EEPROM