[Bugme-new] [Bug 11283] New: MSI patch blamed for T60p not coming out of suspend to ram

[bugme-daemon at bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=11283

           Summary: MSI patch blamed for T60p not coming out of suspend to
                    ram
           Product: Drivers
           Version: 2.5
     KernelVersion: 2.6.27-rc1
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: PCI
        AssignedTo: drivers_pci at kernel-bugs.osdl.org
        ReportedBy: m.s.tsirkin at gmail.com
                CC: matthew at wil.cx, jbarnes at virtuousgeek.org


Latest working kernel version: 2.6.26
Earliest failing kernel version: 2.6.27-rc1
Distribution: ubuntu gutsy
Hardware Environment: T60p
Software Environment: gutsy install with full disk encryption
Problem Description:

Starting 2.6.27-rc1, my laptop won't come out of
suspend to ram: it blinks the crescent a couple of times,
and hangs.
I bisected the problem to the following merge:

bad: [1d9b9f6a53d77ed801ba875f937d6dabbfc381ce] Merge branch 'for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6

I then played with rebase (rebase instead of merge)and got to this commit:

commit ce6fce4295ba727b36fdc73040e444bd1aae64cd
Author: Matthew Wilcox <matthew at wil.cx>
Date:   Fri Jul 25 15:42:58 2008 -0600

    PCI MSI: Don't disable MSIs if the mask bit isn't supported

    David Vrabel has a device which generates an interrupt storm on the INTx
    pin if we disable MSI interrupts altogether.  Masking interrupts is only
    a performance optimisation, so we can ignore the request to mask the
    interrupt.

    Signed-off-by: Matthew Wilcox <willy at linux.intel.com>
    Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>

Reverting ce6fce4295ba727b36fdc73040e444bd1aae64cd
fixes resume from suspend to RAM for me.

Steps to reproduce:

Press Fn-F4 to suspend, press Fn to resume.
This works on 2.6.26, hangs on vanilla 2.6.27-rc1
and 2.6.27-rc2, works on 2.6.27-rc2 with reverted ce6fce..


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