Hello guys,

I'm reporting an issue with Linux kernel >6.12.12 and 6.13.x with mediatek 7925 serie Wi-Fi card. Reproducible ALWAYS. I got a regression with newer firmware and kernel >6.12.12. The regression seems to be between 6.12.12 and 6.12.13 (and ported to 6.13.x). I'm having low speed connection and especially really bad Upload speed (<4Mbit/s) while running in 802.11ax (better speed in 802.11ac), the MIMO/channel width function seems to be linked with this issue.

Here are some speed reports & infos :

With 6.12.1 + firmware-202412x speed is correct (1Gbps/800Mbps) With 6.12.12 + firmware-202412x speed is correct (1Gbps/800Mbps) With 6.12.12 + firmware-202503x speed is NOT correct but between acceptable and unacceptable (350Mbps/25Mbps) With 6.12.13 + firmware-202412x speed is NOT correct but between acceptable and unacceptable (280Mbps/80Mbps) With 6.12.13 + firmware-202503x speed is unacceptable (280Mbps/3mbps) With 6.12.13 + firmware-202503x BUT with only one Wi-Fi channel (here ch 36) (See at the end of this message) ie 20Mhz channel width, I got better upload speed than in wider channel width (80Mbps/30Mbps).

Kernel 6.13 + Linux Firmware 202412 version. [24305.691750] Loading firmware: mediatek/mt7925/WIFI_RAM_CODE_MT7925_1_1.bin [24305.695281] mt7925e 0000:73:00.0: ASIC revision: 79250000 [24305.772614] Loading firmware: mediatek/mt7925/WIFI_MT7925_PATCH_MCU_1_1_hdr.bin [24305.772732] mt7925e 0000:73:00.0: HW/SW Version: 0x8a108a10, Build Time: 20241104132949a [24306.121223] Loading firmware: mediatek/mt7925/WIFI_RAM_CODE_MT7925_1_1.bin [24306.121674] mt7925e 0000:73:00.0: WM Firmware Version: ____000000, Build Time: 20241104133053 [24306.207593] Loading firmware: mediatek/mt7925/WIFI_RAM_CODE_MT7925_1_1.bin [24306.804659] mt7925e 0000:73:00.0 wlp115s0: renamed from wlan0

Linux-firmware >=202501, upload speed unacceptable (download quite the same) : [23925.753738] Loading firmware: mediatek/mt7925/WIFI_RAM_CODE_MT7925_1_1.bin [23925.757066] mt7925e 0000:73:00.0: ASIC revision: 79250000 [23925.834400] Loading firmware: mediatek/mt7925/WIFI_MT7925_PATCH_MCU_1_1_hdr.bin [23925.834518] mt7925e 0000:73:00.0: HW/SW Version: 0x8a108a10, Build Time: 20250113153001a [23926.197786] Loading firmware: mediatek/mt7925/WIFI_RAM_CODE_MT7925_1_1.bin [23926.198160] mt7925e 0000:73:00.0: WM Firmware Version: ____000000, Build Time: 20250113153106 [23926.281524] Loading firmware: mediatek/mt7925/WIFI_RAM_CODE_MT7925_1_1.bin

lspci -vvvv 73:00.0 Network controller: MEDIATEK Corp. Device 7925 Subsystem: AzureWave Device 6002 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 195 IOMMU group: 25 Region 0: Memory at 82200000 (64-bit, non-prefetchable) [size=2M] Region 2: Memory at 82400000 (64-bit, non-prefetchable) [size=32K] Capabilities: [80] Express (v2) Endpoint, IntMsgNum 0 DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s unlimited, L1 unlimited ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset+ SlotPowerLimit 10W TEE-IO- DevCtl: CorrErr- NonFatalErr- FatalErr- UnsupReq- RlxdOrd- ExtTag+ PhantFunc- AuxPwr- NoSnoop+ FLReset- MaxPayload 256 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 Disabled; RCB 64 bytes, LnkDisable- CommClk+ ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- 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: 50us to 50ms, 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 Capabilities: [e0] MSI: Enable+ Count=1/32 Maskable+ 64bit+ Address: 00000000fee54000 Data: 0022 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: 3145728ns Max no snoop latency: 3145728ns 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=118784ns L1SubCtl2: T_PwrOn=52us 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: 0e, ECRCGenCap- ECRCGenEn- ECRCChkCap- ECRCChkEn- MultHdrRecCap- MultHdrRecEn- TLPPfxPres- HdrLogCap- HeaderLog: 00000000 00000000 00000000 00000000 Kernel driver in use: mt7925e Kernel modules: mt7925e

The AP is a Cisco 9120AXI running in 160Mhz channel width @ (52, 56, 60, 64, 36, 40, 44, 48) channels (yes reported in this order, I think it can mind) 52 is the primary one. Also tested this setup with another cheap AP with channel in "correct" order ? It can maybe be a little better but doesn't change a lot of things.

The setup is the same as previously where I was able to get 1Gbit/s Upload speed, just kernel & firmware update.

Any way to fix it ? Best regards,