Did you happen to have a chance to test the latest mainline kernel, posted in comment #2? Mainline is now up to -rc7, so the link to the kernel would be:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-rc7-wily/ If the bug is fixed in mainline, we can perform a reverse bisect to identify the commit that fixes it. However, if the bug still exists in mainline, we would want to perform a regular kernel bisect to find the commit that introduced the regression. To perform a bisect, we need to identify the last good and first bad kernel versions. Per comment #7 v3.16 is good, but v3.19 is bad. We would want to test the versions in between. So if mainline still has the bug, can you test the following upstream kernels: v3.17: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.17-utopic/ v3.18: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.18-vivid/ Once we have these results, we can narrow down the versions further to individual release candidates. Thanks in advance! ** Tags added: performing-bisect -- 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/1571798 Title: Broadwell ECRC Support missing in Ubuntu Status in linux package in Ubuntu: Confirmed Bug description: Here is the problem statement from the Dell team: When booting into Ubuntu 14.04.4 with a Broadwell CPU and an Intel Quick Assist Card, the memory location that corresponds to ECRC is set to 0x01e0, when the BIOS is setting this location 0x00a0 pre-OS boot. This causes the card to not function unless we implement the following workaround using setpci. “setpci –s AA:BB.C 160.w=0”, where AA:BB.C is the PCI Root Path for the Intel Quick Assit Card. We’ve verified the memory location is correct when booting to other OSes, such as RHEL 7.2 and Windows Server 2012 R2. If there is any information you can give as to why this may be occurring in Ubuntu or where we may start to debug when the memory is changed, we would appreciate it. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1571798/+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
