On Thu, Feb 9, 2017 at 9:09 PM, Larry Finger wrote:
> On 02/09/2017 01:43 PM, Bjorn Helgaas wrote:
>>
>> [+cc rtl8192ce folks in case they've seen this]
>>
>> On Thu, Feb 09, 2017 at 03:45:01PM +0100, rupert THURNER wrote:
>>>
>>> hi,
>>>
>>> not technical expert enough, i just wanted to give a short user
>>> feedback. for realtek wlan on atom, kernels up to 4.9.5 are ok, and
>>> kernel 4.10.0-rc7-g926af6273fc6 (arch linux-git version numbering) as
>>> well. kernels 4.9.6, 4.9.7, and 4.9.8 fail, i.e. connection to a WLAN
>>> hotspot is possible then drops, or connecting to wlan fails
>>> alltogether.
>>
>>
>> Thanks very much for your report, and sorry for the inconvenience.
>>
>> v4.10-rc7 works, so I guess we don't need to worry about fixing v4.10.
>>
>> But the stable kernels v4.9.6, v4.9.7, and v4.9.8 are broken, so we
>> need to figure out why and make sure we fix the v4.9 stable series.
>>
>> I can't tell yet whether this is PCI-related or not. If it is,
>> 4922a6a5cfa7 ("PCI: Enumerate switches below PCI-to-PCIe bridges")
>> appeared in v4.9.6, and there is a known issue with that. The issue
>> should be fixed by 610c2b7ff8f6 ("PCI/ASPM: Handle PCI-to-PCIe bridges
>> as roots of PCIe hierarchies"), which appeared in v4.9.9, so I guess
>> the first thing to do would be to test v4.9.9.
>>
>> If it's not fixed in v4.9.9, can you share the complete dmesg log
>> (output of "dmesg" command) and "lspci -vv" output for v4.9.5 (last
>> known working version) and v4.9.6 (first known broken version)? On
>> v4.9.6, collect the dmesg output after the failure occurs.
>
> It would be helpful if someone were to bisect this issue. The only issue
> that comes to mind was fixed in commit 52f5631a4c05 ("rtlwifi: rtl8192ce:
> Fix loading of incorrect firmware") which is in 4.10-rc7 and will be
> backported to 4.9.
thanks for the quick and very helpful hints! larry, it matches what
you write - 4.9.9 dropped the connection after a couple of hours.
lspci -vv is the same for 4.9.5 and 4.9.6. dmesg for both below. in
this case with 4.9.6 it did never get a network connection after boot.
$ sudo lspci -vv
00:00.0 Host bridge: Intel Corporation Atom Processor
D4xx/D5xx/N4xx/N5xx DMI Bridge (rev 02)
Subsystem: Intel Corporation Atom Processor D4xx/D5xx/N4xx/N5xx DMI Bridge
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort-
SERR-
Kernel modules: intel_agp
00:1b.0 Audio device: Intel Corporation NM10/ICH7 Family High
Definition Audio Controller (rev 02)
Subsystem: Holco Enterprise Co, Ltd/Shuttle Computer Device 2005
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
SERR- TAbort-
SERR- TAbort-
Reset- FastB2B-
PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
Capabilities: [40] Express (v1) Root Port (Slot+), MSI 00
DevCap: MaxPayload 128 bytes, PhantFunc 0
ExtTag- RBE-
DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 128 bytes, MaxReadReq 128 bytes
DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
LnkCap: Port #1, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency
L0s <256ns, L1 <4us
ClockPM- Surprise- LLActRep+ BwNot- ASPMOptComp-
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive+
BWMgmt- ABWMgmt-
SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug+ Surprise+
Slot #32, PowerLimit 10.000W; Interlock- NoCompl-
SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet- CmdCplt- HPIrq- LinkChg-
Control: AttnInd Unknown, PwrInd Unknown, Power- Interlock-
SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet+ Interlock-
Changed: MRL- PresDet+ LinkState+
RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible-
RootCap: CRSVisible-
RootSta: PME ReqID , PMEStatus- PMEPending-
Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
Address: fee0f00c Data: 41a1
Capabilities: [90] Subsystem: Holco Enterprise Co, Ltd/Shuttle
Computer Device 2005
Capabilities: [a0] Power Management version 2
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] 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=01
Status: NegoPending- InProgress-
VC1: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
Arb: Fixed+ WRR32- WRR64- WRR128- TWRR128- WRR256-
Ctrl: Enable- ID=0 ArbSelect=Fixed TC/VC=00
Status: NegoPending- InProgress-
Capabilities: [180 v1] Root Complex Link
Desc: PortNumber