Ubuntu
linux-source-2.6.20 package

3 usb hubs disappeared from lspci

Bug #68639 reported by Nicolas Gama
4
Affects Status Importance Assigned to Milestone
linux-source-2.6.20 (Ubuntu)
Won't Fix
Undecided
Unassigned
linux-source-2.6.22 (Ubuntu)
Fix Released
Undecided
Unassigned

Bug Description

Binary package hint: linux-image-2.6.15-27-k7

in the kernel 2.6.15-27-k7, three internal usb hubs are not recognized (not even listed in lspci)
in the kernel 2.6.15-26-k7, everything works fine.

here is the part of lspci -tv for kernel 2.6.15-26-k7:
-----------------------------------------------------------------
 \-[00]-+-06.0-[01]--+-00.0 Advanced Micro Devices [AMD] AMD-8111 USB
        | +-00.1 Advanced Micro Devices [AMD] AMD-8111 USB
        | +-03.0 NEC Corporation USB
        | +-03.1 NEC Corporation USB
        | +-03.2 NEC Corporation USB 2.0
        | \-04.0 Texas Instruments TSB43AB22/A IEEE-1394a-2000 Controller (PHY/Link)
--------------------------------------------------------------

the same part in lspci -tv for kernel 2.6.15-27-k7:
--------------------------------------------------------------
 \-[00]-+-06.0-[01]--+-00.0 Advanced Micro Devices [AMD] AMD-8111 USB
        | +-00.1 Advanced Micro Devices [AMD] AMD-8111 USB
        | \-04.0 Texas Instruments TSB43AB22/A IEEE-1394a-2000 Controller (PHY/Link)
----------------------------------------------------------------
(only the three NEC USB... are missing)

In /var/log/messages, the only difference occurs during the loading of the module ohci_hcd, where the usb hubs should be listed, but aren't in 2.6.15-27.

the option noapic does not change anything.

Note that there are no PS/2 ports, so the keyboard and the mouse are connected to these USB ports (they work in the BIOS and in Grub, but are desactivated just after leaving the grub)

Maybe it is a bug during the parsing of ACPI tables, or maybe this parsing occurs too early.

Revision history for this message
Nicolas Gama (gama-nicolas) wrote : The probe of PCI busses occurs too early !

I fixed this problem by adding a delay of 1 second at the beginning of the function pci_do_scan_bus(struct pci_bus *bus) in drivers/pci/probe.c.

I added these lines:
----------------------------------------------------------------
        int wait1,wait2,dummy;
        dummy=0;
        printk("PCI-Gam: Wait 1 second\n");
        for (wait1=0;wait1!=1000000;wait1++)
            for (wait2=0;wait2!=6000;wait2++)
                dummy = 123456-dummy;
        printk("PCI-Gam: Start scanning bus\n");
-----------------------------------------------------------------

Now when the PCI driver scans the root bus (after the small delay), it finds the three USB hubs correctly.

At last I can use my keyboard !

Revision history for this message
Nicolas Gama (gama-nicolas) wrote :

Problem still there in linux-source-2.6.20-16-generic

Revision history for this message
Leann Ogasawara (leannogasawara) wrote :

Thank you for taking the time to report this bug and helping to make Ubuntu better. Now that the 7.10 Gutsy Gibbon release of Ubuntu is out, we were wondering if you can still reproduce this issue. Could you please download and try the new version of Ubuntu from http://www.ubuntu.com/getubuntu/download and report back your results. If the issue is still present in the new release, please attach the following information:

* uname -a > uname-a.log
* cat /proc/version_signature > version.log
* dmesg > dmesg.log
* sudo lspci -vvnn > lspci-vvnn.log

Please be sure to attach each file as a separate attachment. For more information regarding the kernel team bug policy, please refer to https://wiki.ubuntu.com/KernelTeamBugPolicies . Thanks again and we appreciate your help and feedback.

Changed in linux-source-2.6.20:
status: New → Incomplete
Revision history for this message
Nicolas Gama (gama-nicolas) wrote :

The new Kernel in Gutsy works fine (Ubuntu 2.6.22-14.46-generic)
I will report back if the proplem re-appears during a future upgrade.

Leann Ogasawara (leannogasawara)
Changed in linux-source-2.6.22:
status: New → Fix Released
Changed in linux-source-2.6.20:
status: Incomplete → Won't Fix
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