[Bugme-new] [Bug 21102] New: intel_idle: C4 state in Atom leads to problems with USB audio playback

bugzilla-daemon at bugzilla.kernel.org bugzilla-daemon at bugzilla.kernel.org
Sun Oct 24 10:59:30 PDT 2010


https://bugzilla.kernel.org/show_bug.cgi?id=21102

           Summary: intel_idle: C4 state in Atom leads to problems with
                    USB audio playback
           Product: Power Management
           Version: 2.5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: intel_idle
        AssignedTo: power-management_intel_idle at kernel-bugs.osdl.org
        ReportedBy: dennis.jansen at web.de
                CC: lenb at kernel.org
        Regression: No


Previously I reported here (https://bugzilla.kernel.org/show_bug.cgi?id=19762)
that intel_idle didn't support my Atom C4 and C6 idle states. Now that's fixed.

But now my computer has the problem that usb-audio playback is very corrupted
and thus unusable. It is directly related not only to intel_idle, but exactly
the C4 state:
1. I diagnosed the problem
2. I started with max_cstate=2 -> no problems
3. I started with max_cstate=4 -> extremely bad problems with sound
4. I patched intel_idle and disabled (commented out) the C4 state -> no
problems.

Any idea what a prettier solution to the problem might be?
Thanks! :)

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