So I messed around with this machine for a good part of the day. I built and booted 3.14-rc4, then instrumented the mei and mei-me modules to show the various setup and teardown stages. I think they are correct. What I did find were some issues with MSI. In fact, if you boot with MSI disabled (pci=nomsi) on the kernel command line, then this machine won't _reboot_ without a power cycle. This seems indicative of a BIOS problem.
I then removed pci=nomsi and instrumented the MEI module such that it does not attempt to use MSI (instead uses normal threaded interrupts) and voila it started rebooting. I guess the solution is to either add a module parameter to the MEI module that allows one to selectively disable MSI, or get the platform BIOS vendors to fix their MSI support. Note that there are other consumers of MSI on this platform such as the igb NIC driver. -- 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/1154749 Title: reboot does a shutdown instead of rebooting (OCP v2) Status in OEM Priority Project: Invalid Status in Open Compute Project: New Status in “linux” package in Ubuntu: Confirmed Bug description: On the OCP v2 compliant system (Windmill OCP motherboard v2), the system hang at the reboot startup. This issue happens on 12.04.1, 12.04.2 and 12.10. The work around in http://ubuntuforums.org/showthread.php?t=2024096, blacklisting mei, works. Note the first reboot doesn't work, but the subsequent reboots work. mei in 12.04.1 $ modinfo mei filename: /lib/modules/3.2.0-38-generic/kernel/drivers/staging/mei/mei.ko version: 7.1.20.1 license: GPL v2 description: Intel(R) Management Engine Interface author: Intel Corporation srcversion: 9252880194B02634B5F0427 Kernel mei message before blacklisted: kernel: [ 6.961623] mei: module is from the staging directory, the quality is unknown, you have been warned. kernel: [ 6.962226] mei 0000:00:16.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 kernel: [ 6.962235] mei 0000:00:16.0: setting latency timer to 64 kernel: [ 6.962310] mei 0000:00:16.0: irq 104 for MSI/MSI-X mei in 12.04.2 $ modinfo mei filename: /lib/modules/3.5.0-25-generic/kernel/drivers/misc/mei/mei.ko license: GPL v2 description: Intel(R) Management Engine Interface author: Intel Corporation srcversion: 0580619CB5DEF6AB7228EBE Kernel mei message before blacklisted: kernel: [ 6.543470] mei 0000:00:16.0: setting latency timer to 64 kernel: [ 6.543547] mei 0000:00:16.0: irq 104 for MSI/MSI-X kernel: [ 6.547516] mei 0000:00:16.0: wd: failed to find the client mei in 12.10 $ modinfo mei filename: /lib/modules/3.5.0-21-generic/kernel/drivers/misc/mei/mei.ko license: GPL v2 description: Intel(R) Management Engine Interface author: Intel Corporation srcversion: 0580619CB5DEF6AB7228EBE Kernel mei message before blacklisted: kernel: [ 4.731997] mei 0000:00:16.0: setting latency timer to 64 kernel: [ 4.736801] mei 0000:00:16.0: irq 104 for MSI/MSI-X kernel: [ 4.741695] mei 0000:00:16.0: wd: failed to find the client To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1154749/+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
