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,
