Re: [PATCH] PCI / ACPI: Always resume devices on ACPI wakeup notifications

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Hi Sarah,
  does anyone has any comments to this thread? I just retried with 3.8.8
kernel and it is still same issue. I can put to 'auto' upstream 1c.4 port,
detach mouse and the 1c.4 does not suspend (due to a recent patch I think
around 3.8.5).
If I set also its downstream 0b:00 to 'auto', plugin mouse ... mouse works,
after I unplug the mouse the 0b:00 goes 'suspended' and XHCI socket dies.

Here is comparison of the 'active' state and of the 'suspended' to death
(note pcie_aspm=off on my kernel command line):
--- lspci_vvv_initial.txt       2013-04-20 00:16:11.000000000 +0200
+++ lspci_vvv_initial__mouse_attached__detached__attached__1c.4_to_auto__detached__0b:00_to_auto.txt    2013-04-20 00:18:38.000000000 +0200
@@ -484,15 +484,14 @@
 
 0b:00.0 USB controller: Texas Instruments TUSB73x0 SuperSpeed USB 3.0 xHCI Host Controller (rev 02) (prog-if 30 [XHCI])
        Subsystem: Dell Device 04b3
-       Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
+       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 16
        Region 0: Memory at f7d00000 (64-bit, non-prefetchable) [size=64K]
        Region 2: Memory at f7d10000 (64-bit, non-prefetchable) [size=8K]
        Capabilities: [40] Power Management version 3
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=100mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
-               Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
+               Status: D3 NoSoftRst+ PME-Enable+ DSel=0 DScale=0 PME-
        Capabilities: [48] MSI: Enable- Count=1/8 Maskable- 64bit+
                Address: 0000000000000000  Data: 0000
        Capabilities: [70] Express (v2) Endpoint, MSI 00


If I put back 0b:00/control to 'on' I rescue the XHCI socket.



So, should the TI host be blacklisted so that it is never put into suspend
state? I wrote already that I don't think it is necessary but looks nobody
looked into the lspci files. So, here is my interpretation:


See another test scenario:

1. When I bootup without any devices attached to the TI host (no laptop-mode-tools), the TI host at 0b:00 is active.

2. If I enable powersaving via setting control file to 'auto' of 1c.4 (just to be sure) and 0b:00,
the 0b:00 goes after a while suspended. But it is not dead, if I connect a mouse to the XHCI socket
it would work. BUt look how such 'softly suspended' state looks like:

# diff -u -w lspci_vvv_initial.txt lspci_vvv_initial__1c.4_and_0b:00_to_auto.txt
--- lspci_vvv_initial.txt       2013-04-20 01:06:51.000000000 +0200
+++ lspci_vvv_initial__1c.4_and_0b:00_to_auto.txt       2013-04-20 01:08:46.000000000 +0200
@@ -484,15 +484,14 @@
 
 0b:00.0 USB controller: Texas Instruments TUSB73x0 SuperSpeed USB 3.0 xHCI Host Controller (rev 02) (prog-if 30 [XHCI])
        Subsystem: Dell Device 04b3
-       Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
+       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 16
        Region 0: Memory at f7d00000 (64-bit, non-prefetchable) [size=64K]
        Region 2: Memory at f7d10000 (64-bit, non-prefetchable) [size=8K]
        Capabilities: [40] Power Management version 3
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=100mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
-               Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
+               Status: D3 NoSoftRst+ PME-Enable+ DSel=0 DScale=0 PME-
        Capabilities: [48] MSI: Enable- Count=1/8 Maskable- 64bit+
                Address: 0000000000000000  Data: 0000
        Capabilities: [70] Express (v2) Endpoint, MSI 00
#


3. Now, look what happens if I plugin a mouse (works, as I said, and uplug it, which triggers a deadly suspend,
although reversible):

# diff -u -w lspci_vvv_initial__1c.4_and_0b:00_to_auto.txt lspci_vvv_initial__1c.4_and_0b:00_to_auto__mouse_attached_and_works__detached.txt
--- lspci_vvv_initial__1c.4_and_0b:00_to_auto.txt       2013-04-20 01:08:46.000000000 +0200
+++ lspci_vvv_initial__1c.4_and_0b:00_to_auto__mouse_attached_and_works__detached.txt   2013-04-20 01:10:06.000000000 +0200
@@ -271,7 +271,7 @@
                        Changed: MRL- PresDet- LinkState+
                RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible-
                RootCap: CRSVisible-
-               RootSta: PME ReqID 0000, PMEStatus- PMEPending-
+               RootSta: PME ReqID 0b00, PMEStatus- PMEPending-
                DevCap2: Completion Timeout: Range BC, TimeoutDis+, LTR-, OBFF Not Supported ARIFwd-
                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled ARIFwd-
                LnkCtl2: Target Link Speed: 5GT/s, EnterCompliance- SpeedDis-

4. Interestingly, if I connect a mouse to the socket to show it is "dead" there is a tiny change in lspci:

--- lspci_vvv_initial__1c.4_and_0b:00_to_auto__mouse_attached_and_works__detached.txt   2013-04-20 01:10:06.000000000 +0200
+++ lspci_vvv_initial__1c.4_and_0b:00_to_auto__mouse_attached_and_works__detached__reattached_but_dead.txt      2013-04-20 01:10:28.000000000 +0200
@@ -491,7 +491,7 @@
        Region 2: Memory at f7d10000 (64-bit, non-prefetchable) [size=8K]
        Capabilities: [40] Power Management version 3
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=100mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
-               Status: D3 NoSoftRst+ PME-Enable+ DSel=0 DScale=0 PME-
+               Status: D3 NoSoftRst+ PME-Enable+ DSel=0 DScale=0 PME+
        Capabilities: [48] MSI: Enable- Count=1/8 Maskable- 64bit+
                Address: 0000000000000000  Data: 0000
        Capabilities: [70] Express (v2) Endpoint, MSI 00


5. I said the port 'suspended to death' can be rescued by echo 'on' > .../*0b:00*/control (the mouse was
plugged in during the echo command so we see not only PME changes but also D3 to D0 change because the
mouse is attached):

# diff -u -w lspci_vvv_initial__1c.4_and_0b\:00_to_auto__mouse_attached_and_works__detached__reattached_but_dead.txt lspci_vvv_initial__1c.4_and_0b\:00_to_auto__mouse_attached_and_works__detached__rea
ttached_but_dead__0b\:00_to_on_rescues.txt 
--- lspci_vvv_initial__1c.4_and_0b:00_to_auto__mouse_attached_and_works__detached__reattached_but_dead.txt      2013-04-20 01:10:28.000000000 +0200
+++ lspci_vvv_initial__1c.4_and_0b:00_to_auto__mouse_attached_and_works__detached__reattached_but_dead__0b:00_to_on_rescues.txt 2013-04-20 01:12:25.000000000 +0200
@@ -484,14 +484,15 @@
 
 0b:00.0 USB controller: Texas Instruments TUSB73x0 SuperSpeed USB 3.0 xHCI Host Controller (rev 02) (prog-if 30 [XHCI])
        Subsystem: Dell Device 04b3
-       Control: I/O- Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
+       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 16
        Region 0: Memory at f7d00000 (64-bit, non-prefetchable) [size=64K]
        Region 2: Memory at f7d10000 (64-bit, non-prefetchable) [size=8K]
        Capabilities: [40] Power Management version 3
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=100mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
-               Status: D3 NoSoftRst+ PME-Enable+ DSel=0 DScale=0 PME+
+               Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [48] MSI: Enable- Count=1/8 Maskable- 64bit+
                Address: 0000000000000000  Data: 0000
        Capabilities: [70] Express (v2) Endpoint, MSI 00



6. When I unplug the mouse of course the port does not die because the control file is set to 'on'.
I already demonstrated that but once again, setting 0b:00 to 'auto':

# diff -u -w lspci_vvv_initial__1c.4_and_0b\:00_to_auto__mouse_attached_and_works__detached__reattached_but_dead__0b\:00_to_on_rescues__detached.txt lspci_vvv_initial__1c.4_and_0b\:00_to_auto__mouse_attached_and_works__detached__reattached_but_dead__0b\:00_to_on_rescues__detached__0b\:00_to_auto.txt 
--- lspci_vvv_initial__1c.4_and_0b:00_to_auto__mouse_attached_and_works__detached__reattached_but_dead__0b:00_to_on_rescues__detached.txt       2013-04-20 01:13:36.000000000 +0200
+++ lspci_vvv_initial__1c.4_and_0b:00_to_auto__mouse_attached_and_works__detached__reattached_but_dead__0b:00_to_on_rescues__detached__0b:00_to_auto.txt        2013-04-20 01:14:41.000000000 +0200
@@ -484,15 +484,14 @@
 
 0b:00.0 USB controller: Texas Instruments TUSB73x0 SuperSpeed USB 3.0 xHCI Host Controller (rev 02) (prog-if 30 [XHCI])
        Subsystem: Dell Device 04b3
-       Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
+       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 16
        Region 0: Memory at f7d00000 (64-bit, non-prefetchable) [size=64K]
        Region 2: Memory at f7d10000 (64-bit, non-prefetchable) [size=8K]
        Capabilities: [40] Power Management version 3
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=100mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
-               Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
+               Status: D3 NoSoftRst+ PME-Enable+ DSel=0 DScale=0 PME-
        Capabilities: [48] MSI: Enable- Count=1/8 Maskable- 64bit+
                Address: 0000000000000000  Data: 0000
        Capabilities: [70] Express (v2) Endpoint, MSI 00
@@ -521,7 +520,7 @@
                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- NonFatalErr+
+               CESta:  RxErr- BadTLP- BadDLLP+ Rollover- Timeout- NonFatalErr+
                CEMsk:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
                AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
        Capabilities: [150 v1] Device Serial Number 08-00-28-00-00-20-00-00


7. Now, a question to the reader: If I attach the mouse, will it work or not?


# diff -u -w lspci_vvv_initial__1c.4_and_0b\:00_to_auto__mouse_attached_and_works__detached__reattached_but_dead__0b\:00_to_on_rescues__detached__0b\:00_to_auto.txt lspci_vvv_initial__1c.4_and_0b\:00_to_auto__mouse_attached_and_works__detached__reattached_but_dead__0b\:00_to_on_rescues__detached__0b\:00_to_auto__attached_dead.txt 
--- lspci_vvv_initial__1c.4_and_0b:00_to_auto__mouse_attached_and_works__detached__reattached_but_dead__0b:00_to_on_rescues__detached__0b:00_to_auto.txt        2013-04-20 01:14:41.000000000 +0200
+++ lspci_vvv_initial__1c.4_and_0b:00_to_auto__mouse_attached_and_works__detached__reattached_but_dead__0b:00_to_on_rescues__detached__0b:00_to_auto__attached_dead.txt 2013-04-20 01:17:59.000000000 +0200
@@ -491,7 +491,7 @@
        Region 2: Memory at f7d10000 (64-bit, non-prefetchable) [size=8K]
        Capabilities: [40] Power Management version 3
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=100mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
-               Status: D3 NoSoftRst+ PME-Enable+ DSel=0 DScale=0 PME-
+               Status: D3 NoSoftRst+ PME-Enable+ DSel=0 DScale=0 PME+
        Capabilities: [48] MSI: Enable- Count=1/8 Maskable- 64bit+
                Address: 0000000000000000  Data: 0000
        Capabilities: [70] Express (v2) Endpoint, MSI 00
#


No, it did not work. Situation in step 7 is same like in step 4. The diff below is likely benign:

# diff -u -w lspci_vvv_initial__1c.4_and_0b\:00_to_auto__mouse_attached_and_works__detached__reattached_but_dead.txt lspci_vvv_initial__1c.4_and_0b\:00_to_auto__mouse_attached_and_works__detached__reattached_but_dead__0b\:00_to_on_rescues__detached__0b\:00_to_auto__attached_dead.txt 
--- lspci_vvv_initial__1c.4_and_0b:00_to_auto__mouse_attached_and_works__detached__reattached_but_dead.txt      2013-04-20 01:10:28.000000000 +0200
+++ lspci_vvv_initial__1c.4_and_0b:00_to_auto__mouse_attached_and_works__detached__reattached_but_dead__0b:00_to_on_rescues__detached__0b:00_to_auto__attached_dead.txt 2013-04-20 01:17:59.000000000 +0200
@@ -520,7 +520,7 @@
                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- NonFatalErr+
+               CESta:  RxErr- BadTLP- BadDLLP+ Rollover- Timeout- NonFatalErr+
                CEMsk:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
                AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
        Capabilities: [150 v1] Device Serial Number 08-00-28-00-00-20-00-00
#



Collected data are at http://195.113.57.32/~mmokrejs/tmp/20130420.tar.bz2 (90kB)

Thanks,
Martin


Martin Mokrejs wrote:
> 
> 
> Huang Ying wrote:
>> Hi, Martin,
>>
>> On Wed, 2013-04-03 at 14:16 +0200, Martin Mokrejs wrote:
>>> Meanwhile, the raw data: http://195.113.57.32/~mmokrejs/tmp/20130402.tar.bz2
>>> (size 468641 bytes)
>>
>> Thanks a lot!  Your information is very complete and clear :)
>>
>>> They were collected by:
>>>
>>> # cat ~/bin/collect_runtime_status.sh 
>>> #!/bin/sh
>>> grep . /sys/bus/pci/devices/*/power/runtime_status > runtime_status_"$1".txt
>>> grep . /sys/bus/pci/devices/*/power/control > control_"$1".txt
>>> cat /proc/interrupts > interrupts_"$1".txt
>>> cat /proc/iomem > iomem_"$1".txt
>>> lspci -vvv > lspci_vvv_"$1".txt
>>> dmesg > dmesg_"$1".txt
>>> #
>>>
>>> Just do 'ls -latr' to see the ordering of the files as they were created.
>>> The longer the filename, the later in the test process. The names should be
>>> relatively self-explaining. Definitely, from the log files you should see
>>> what happened in real and therefore, can figure out what the (maybe weird)
>>> long filename really meant.
>>>
>>> Sometimes I manually recorded lsusb of dmesg_final.txt, mostly after I did some
>>> extra tests but but not want to record every step by the above 6 files.
>>>
>>> In one or two places I added some my own notes into COMMENTS file.
>>>
>>>
>>>
>>>
>>> I will try to guide your below where you can study which of the bugs. Mostly,
>>> for each bug you need just one subdirectory to look into, the other are just
>>> repeated the same bug under different kernel version or another patch.
>>> However, Sarah for the xHCI dead port issue will need to compare by diff
>>> two directories, one with the TI-based controller tests, the other with the
>>> NEC-based tests. Especially there, I would do something like:
>>>
>>> cd *TI-based; for f in dmesg*; do cut -c 15- $f > /tmp/TI/$f; done
>>> cd ../*NEC-based; for f in dmesg*; do cut -c 15- $f > /tmp/NEC/$f; done
>>>
>>> Then it should be easier to poke through file captured at the same test step,
>>> like:
>>>
>>> diff -u -w /tmp/TI/dmesg_initial__mouse_attached__unplugged__reattached_but_port_dead.txt \
>>> /tmp/NEC/dmesg_initial__mouse_attached__detached__reattached.txt
>>>
>>>
>>>
>>> Other than that, just diff pairs of files with each other, like:
>>>
>>> diff -u -w lspci_vvv_initial.txt lspci_vvv_initial__mouse_attached.txt
>>>
>>>
>>> Sorry that I sometimes used only a single underscore instead of double underscores
>>> to separate the test steps from each other in the filename.
>>>
>>>
>>> Martin Mokrejs wrote:
>>>> [ +linux-pci and Yinghai as they suffered already those many emails on individual
>>>>  threads so one overviewing email hopefully won't harm] ;-)
>>>>
>>>> Martin Mokrejs wrote:
>>>>>
>>>>>
>>>>> Bjorn Helgaas wrote:
>>>>>> On Tue, Apr 2, 2013 at 9:02 AM, Martin Mokrejs
>>>>>> <mmokrejs@xxxxxxxxxxxxxxxxxx> wrote:
>>>>>>> Hi Ying,
>>>>>>>
>>>>>>> huang ying wrote:
>>>>>>
>>>>>>>> And please give me the full dmesg for boot and incremental dmesg for
>>>>>>>> operations.
>>>>>>>
>>>>>>>
>>>>>>> The incremental bits here, the full dmesg will send only directly to your email, due to its size.
>>>>>>
>>>>>> Is there a bugzilla for this issue?  Please attach the complete dmesg
>>>>>> there or somewhere similar so we can all benefit.
>>>>>
>>>>> I changed my mind. I am attaching the dmesg here but omitting linux-acpi
>>>>> list. After I hear a proposal from Rafel/Bjorn I will open separate bugs.
>>>>> I thought that the threads I started so far were enough but yes, dmesg
>>>>> files don't pass through list filters so I should move that to bugzilla.
>>>>>
>>>>> so far my view of the the bugs was:
>>>>>
>>>>> 1) acpiphp hotplug broken due to upstream pcieport 1c.7 PME# enabled
>>>>>   (eSATA-based card)
>>>>
>>>> Fixed by Ying Huang port_dbg.patch applied over 3.8.5 (fixes acpiphp hotplug
>>>> of eSATA and Firewire cards, NOT the hotplug of a NEC-based USB3 card -> hence
>>>> the bug 4) below). Now I can continue using laptop-mode-tools.
>>>
>>> 20130402/3.8.5-ying_port-dbg__with_laptop-mode-tools_eSATA_testing
>>> 20130402/3.8.3-vanilla__with_laptop-mode-tools (with some comments in
>>>                                                 COMMENTS file)
>>
>> Thanks for your testing!
>>
>>>>> 2) xHCI dead due to to its suspend - 3.8 series and above
>>>>
>>>> Not fixed by port_dbg.patch applied over 3.8.5. Interestingly, a NEC-based
>>>> XHCI card *in an express card slot* does not suffer this suspend issue.
>>>> Although it is being put into suspend if a device is unplugged.
>>>
>>> 20130402/3.8.5-ying_port-dbg__with_laptop-mode-tools_xHCI_test_TI-based
>>> 20130402/3.8.5-ying_port-dbg__with_laptop-mode-tools_xHCI_test_NEC-based
>>>
>>> Same thing but yet without the port_dbg.patch:
>>> 20130402/3.9-rc5__with_2368081__with-latop-mode-tools_xhci_testing/
>>
>> It appears that TI xHCI dead port issue will present even if the PCIe
>> port will never go suspended.  So I think this bug is not related to
>> PCIe port runtime PM but related to USB xHCI.
>>
>> Do you agree Sarah?
> 
> Although I confirmed with 20130405.tar.bz2 dataset what Sarah repeated from our
> past findings in the email which should be just in your your inbox, one thing is
> puzzling:
> When I have powersaving enabled upon bootup with NO USB devices attached to the TI
> controller, effectively while reaching multiuser mode the 0b:00.0 is in a suspend
> state. But, somehow, the very first mouse plugin works. Only the reject causes
> more 'aggressive' suspend.
> As it seems no upstream 1c.4 is messing up here (in the test Sarah wanted me to do
> we have all control files 'on' except the end 0b:00.0) then really still something
> *else* is causing the dead port *in conjunction* with 'suspended' runtime state.
> Please double check what I wrote initially about the 20130402.tar.bz2 dataset.
> Notably, I would compare lspci outputs from a cold boot state with no devices
> attached and suspended 0b:00.0 (the 20130402.tar.bz2 dataset) with the dead port
> status in lspci (find any in 20130402.tar.bz2 or now in 20130405.tar.bz2).
> 
> Martin
> 
>>
>> [snip]
>>
>> Best Regards,
>> Huang Ying
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