This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- xenial' to 'verification-done-xenial'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-xenial -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1606147 Title: [APL][SAUCE] Slow system response time due to a monitor bug Status in HWE Next: Confirmed Status in linux package in Ubuntu: Confirmed Status in linux source package in Xenial: Fix Committed Bug description: [Impact] We've found a bug on some Apollo Lake system makes it runs very slow. From upstream it is caused by following reason: "Monitored cached line may not wake up from mwait on certain Goldmont based CPUs. This patch will avoid calling current_set_polling_and_test() and thereby not set the TIF_ flag. The result is that we'll always send IPIs for wakeups." [Fix] Upstream already provided a workaround[1] to fix this problem. This patches haven't been merged in latest(v4.7) release but already in linux-next. To fix this issue in Xenial it also needs another commit introduces macros use in the workaround: commit 970442c599b22ccd644ebfe94d1d303bf6f87c05 Author: Dave Hansen <d...@sr71.net> Date: Thu Jun 2 17:19:27 2016 -0700 x86/cpu/intel: Introduce macros for Intel family numbers This workaround checks CPU families and certain features, so no further regressions is expected [1]: https://lkml.org/lkml/2016/7/6/469 To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1606147/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
