[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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