It seems that the commit that went into 2.6.27 can't be backported to
.26. But, hrtick, what is causing the problem, can be disabled.
The patch to disable hrtick that applies on a vanila 2.6.26.2 kernel and
should also apply to Ubuntu's kernel is below. That patch (or similar)
should go into 2.6.26.3 or 2.6.26.4. See discussion here:
http://lkml.org/lkml/2008/8/19/311
-----------------
The hrtick implementation in 2.6.25 and .26 has been known to cause boot
problems with at least Intel GMA cards. see:
https://bugs.freedesktop.org/show_bug.cgi?id=15602
http://bugzilla.kernel.org/show_bug.cgi?id=10892
A full fix to hrtick went into 2.6.27
(31656519e132f6612584815f128c83976a9aaaef),
but that fix is too intrusive to backport. Henceforth, we default to
disable hrtick.
Signed-off-by: Justin Madru <[EMAIL PROTECTED]>
Tested-by: Justin Madru <[EMAIL PROTECTED]>
Cc: Peter Zijlstra <[EMAIL PROTECTED]>
Cc: Ingo Molnar <[EMAIL PROTECTED]>
--- a/kernel/sched_features.h
+++ b/kernel/sched_features.h
@@ -4,7 +4,7 @@
SCHED_FEAT(AFFINE_WAKEUPS, 1)
SCHED_FEAT(CACHE_HOT_BUDDY, 1)
SCHED_FEAT(SYNC_WAKEUPS, 1)
-SCHED_FEAT(HRTICK, 1)
+SCHED_FEAT(HRTICK, 0)
SCHED_FEAT(DOUBLE_TICK, 0)
SCHED_FEAT(NORMALIZED_SLEEPER, 1)
SCHED_FEAT(DEADLINE, 1)
--
Blank screen when using usplash and kernel >= 2.6.25
https://bugs.launchpad.net/bugs/258381
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
