Hi Linux Firmware Developers, MEDIATEK MT7922 wifi perf degraded a lot after upgrade firmware-mediatek from 20250410-2 to 20260221-1~bpo13+1 or 20260309-1 of debian.
With the new firmware, the wifi iperf3 test speed is around 100MB/s within 1 minute after connected to a wireless router, but it gradually degrades to 10MB/s, router iperf3 sends, pc receives. Router: iperf3 -s PC: iperf3 -c riehyp -t 3600 -R After downgraded firmware-mediatek to 20250410-2, the problem is gone. Please see also these similar reports: https://www.reddit.com/r/archlinux/comments/1rsk5od/for_those_having_network_speed_issues_with_a/ https://bbs.archlinux.org/viewtopic.php?id=312031 The most updated work version on archlinux is 20251125-2. On debian you need to build 20251125 yourself, but it did work with no speed downgrade issue. On version 20260221-1~bpo13+1 and 20260309-1, after the wifi speed downgraded to 10MB/s, if I run bluetoothctl scan on periodically, the speed can go back to 100MB/s. My kernel version is 6.19.10 amd64 # lspci -vvv -s 0c:00.0 0c:00.0 Network controller: MEDIATEK Corp. MT7922 802.11ax PCI Express Wireless Network Adapter Subsystem: MEDIATEK Corp. MT7922 802.11ax PCI Express Wireless Network Adapter Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 180 IOMMU group: 19 Region 0: Memory at fcf5000000 (64-bit, prefetchable) [size=1M] Region 2: Memory at a0300000 (64-bit, non-prefetchable) [size=32K] Capabilities: [80] Express (v2) Endpoint, IntMsgNum 0 DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s unlimited, L1 unlimited ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset+ SlotPowerLimit 26W TEE-IO- DevCtl: CorrErr+ NonFatalErr+ FatalErr+ UnsupReq+ RlxdOrd- ExtTag+ PhantFunc- AuxPwr- NoSnoop+ FLReset- MaxPayload 128 bytes, MaxReadReq 512 bytes DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr- TransPend- LnkCap: Port #1, Speed 5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <2us, L1 <8us ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp+ LnkCtl: ASPM L1 Enabled; RCB 64 bytes, LnkDisable- CommClk+ ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- FltModeDis- LnkSta: Speed 5GT/s, Width x1 TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt- DevCap2: Completion Timeout: Range ABCD, TimeoutDis+ NROPrPrP- LTR+ 10BitTagComp- 10BitTagReq- OBFF Not Supported, ExtFmt+ EETLPPrefix- EmergencyPowerReduction Not Supported, EmergencyPowerReductionInit- FRS- TPHComp- ExtTPHComp- AtomicOpsCap: 32bit- 64bit- 128bitCAS- DevCtl2: Completion Timeout: 260ms to 900ms, TimeoutDis- AtomicOpsCtl: ReqEn- IDOReq- IDOCompl- LTR+ EmergencyPowerReductionReq- 10BitTagReq- OBFF Disabled, EETLPPrefixBlk- LnkCap2: Supported Link Speeds: 2.5-5GT/s, Crosslink- Retimer- 2Retimers- DRS- LnkCtl2: Target Link Speed: 5GT/s, EnterCompliance- SpeedDis- Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS- Compliance Preset/De-emphasis: -6dB de-emphasis, 0dB preshoot LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1- EqualizationPhase2- EqualizationPhase3- LinkEqualizationRequest- Retimer- 2Retimers- CrosslinkRes: unsupported, FltMode- Capabilities: [e0] MSI: Enable+ Count=1/32 Maskable+ 64bit+ Address: 00000000fee00000 Data: 0000 Masking: fffffffe Pending: 00000000 Capabilities: [f8] Power Management version 3 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+) Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME- Capabilities: [100 v1] Vendor Specific Information: ID=1556 Rev=1 Len=008 <?> Capabilities: [108 v1] Latency Tolerance Reporting Max snoop latency: 0ns Max no snoop latency: 0ns Capabilities: [110 v1] L1 PM Substates L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ PortCommonModeRestoreTime=3us PortTPowerOnTime=52us L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- T_CommonMode=0us LTR1.2_Threshold=284672ns L1SubCtl2: T_PwrOn=150us Capabilities: [200 v2] Advanced Error Reporting UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol- UncorrIntErr- BlockedTLP- AtomicOpBlocked- TLPBlockedErr- PoisonTLPBlocked- DMWrReqBlocked- IDECheck- MisIDETLP- PCRC_CHECK- TLPXlatBlocked- UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol- UncorrIntErr+ BlockedTLP- AtomicOpBlocked- TLPBlockedErr- PoisonTLPBlocked- DMWrReqBlocked- IDECheck- MisIDETLP- PCRC_CHECK- TLPXlatBlocked- UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol- UncorrIntErr+ BlockedTLP- AtomicOpBlocked- TLPBlockedErr- PoisonTLPBlocked- DMWrReqBlocked- IDECheck- MisIDETLP- PCRC_CHECK- TLPXlatBlocked- CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- AdvNonFatalErr- CorrIntErr- HeaderOF- CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- AdvNonFatalErr+ CorrIntErr+ HeaderOF- AERCap: First Error Pointer: 00, ECRCGenCap- ECRCGenEn- ECRCChkCap- ECRCChkEn- MultHdrRecCap- MultHdrRecEn- TLPPfxPres- HdrLogCap- HeaderLog: 00000000 00000000 00000000 00000000 Kernel driver in use: mt7921e Kernel modules: mt7921e Openwrt router wlan: Mode: Master Channel: 36 (5.180 GHz) HT Mode: HE160 Center Channel 1: 50 2: unknown Tx-Power: 23 dBm Link Quality: 51/70 Signal: -59 dBm Noise: -92 dBm Bit Rate: 2401.9 MBit/s Encryption: SAE / WPA-PSK / WPA-PSK-SHA256 (CCMP) Type: nl80211 HW Mode(s): 802.11ax/ac/n Hardware: embedded [MediaTek MT7986] TX power offset: none Channel offset: none Supports VAPs: yes PHY name: phy1 Thanks Bob
