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    SubjectRe: 3.2.11: PCI Express card cannot be re-detected withing cca 60sec timeframe
    From
    On Thu, Apr 19, 2012 at 10:32 AM, Martin Mokrejs
    <mmokrejs@fold.natur.cuni.cz> wrote:
    >  this brought me to and issue with "Intel® 6 Series Express Chipset B2 stepping" chips
    > having enabled SATA ports 2-5. This is my case:
    >
    > [    3.037832] ahci 0000:00:1f.2: version 3.0
    > [    3.037880] ahci 0000:00:1f.2: irq 44 for MSI/MSI-X
    > [    3.037906] ahci: SSS flag set, parallel bus scan disabled
    > [    3.048233] ahci 0000:00:1f.2: AHCI 0001.0300 32 slots 6 ports 6 Gbps 0x31 impl SATA mode
    > [    3.048335] ahci 0000:00:1f.2: flags: 64bit ncq sntf stag pm led clo pio slum part ems sxs apst
    > [    3.048371] ahci 0000:00:1f.2: setting latency timer to 64
    > [    3.088902] scsi0 : ahci
    > [    3.089010] scsi1 : ahci
    > [    3.089098] scsi2 : ahci
    > [    3.089185] scsi3 : ahci
    > [    3.089272] scsi4 : ahci
    > [    3.089361] scsi5 : ahci
    > [    3.090528] ata1: SATA max UDMA/133 abar m2048@0xf7f06000 port 0xf7f06100 irq 44
    > [    3.091400] ata2: DUMMY
    > [    3.092262] ata3: DUMMY
    > [    3.093112] ata4: DUMMY
    > [    3.093952] ata5: SATA max UDMA/133 abar m2048@0xf7f06000 port 0xf7f06300 irq 44
    > [    3.094803] ata6: SATA max UDMA/133 abar m2048@0xf7f06000 port 0xf7f06380 irq 44
    >
    >
    > Is this bug anyhow related to this already known chipset issue?
    >
    > http://support.dell.com/support/topics/global.aspx/support/kcs/document?c=us&cs=04&docid=389728&l=en&s=bsd
    > http://www.intel.com/support/chipsets/6/sb/CS-032521.htm
    > http://www.intel.com/support/chipsets/6/sb/CS-032521.htm
    >
    >>
    >
    >
    > So you found two issues, right?
    >
    > Issue 1:
    >
    > Yinghai Lu wrote:
    >> for USB 3.0:
    >>               SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet+ Interlock-
    >>                       Changed: MRL- PresDet- LinkState+
    >>
    >> PresDet+: mean that card is still there. so no interrupt is generated
    >> by chipset.
    >>
    >> that present bit is decide by by inband link or out of band.
    >>
    >> sometimes when out of band pres is no, present bit could be keep flip
    >> around because in root port try to retrain to detect ...
    >> but it is not the case.
    >>
    >> the pin "CPPE#  PCI Express interface presence detect" should get into
    >> hotplug FPGA in motherboard.
    >>
    >> You may need to check with vendor about if there is any problem with
    >> that hotplug FPGA.

    Not sure about this one. could be that outofband signal is not used.



    >
    >
    > Issue 2:
    >>>> Can you try to use acpiphp instead of pciehp?
    >>
    >> looks your BIOS does not support acpiphp.
    >>
    >> Maybe you have to stay with
    >>
    >> echo 1  > .../pcie_link_disable
    >> echo 0  > .../pcie_link_disable
    >>
    >> after removal every time.
    >>
    >
    > Does it make sense to report this to Dell (that it does not support ACPI hotplug)?
    > Can they fix it with BIOS or whatever? Thay will anyways replace my motherboard
    > in the laptop if my system is really affected.

    even there is intel silicon problem <user can not disable inband
    present detecting, and that could report wrong status>
    Dell should have good design to workaround it like add logic to check
    CPPE and reset the link if needed.

    >
    > Can I just return the thing after 2.5 months completely?

    You need to talk to dell about that.

    How about those test on other shipped OS?

    Yinghai
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