Unity + Skylake + Hyper-V xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted)

[Joshua R. Poulson]

Customer using Lenovo P50 (Skylake) and Surface Book (Skylake) laptops tried to start unity in a guest VM on Hyper-V. Kernel 4.4.0-31 started as expected, Hyper-V drivers loaded as expected including the framebuffer driver, plenty of memory and vCPUs allocated, but x.org fails with xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted), resulting in "no screens found".

However, when customer used KDE (kubuntu 16.04 with similar kernel) on these same systems got a UI as expected. Customer also has no issues on non-skylake laptop.

No unexpected messages seen in dmesg and syslog.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Mark Harris (mark-d-harris)]

Ubuntu 14.04, 15.10, and Kubuntu 16.04.1 runs correctly as a Windows 10586 Hyper-V gen2 VM on a Lenovo P50 host. Ubuntu 16.04 fails and does not. It presents the login screen and then displays failures and no desktop. Attached screenshot 1.png shows 3 VM windows and the 16.04 presenting the error dialogs. (the errors flash and only display momentarily).

[Mark Harris (mark-d-harris)]

Adding dmesg attachment.

[Mark Harris (mark-d-harris)]

Adding syslog attachment.

[Joseph Salisbury (jsalisbury)]

@Mark Harris, it's been a while since the last comment. Does this bug still exist with the lastest updates?

[Mark Harris (mark-d-harris)]

Sorry for the delay.. Yes, I just built a new VM using 16.04.2 and it seems to be fine.

Thanks!

Mark

-----Original Message-----
From: <email address hidden> [mailto:<email address hidden>] On Behalf Of Joseph Salisbury
Sent: Thursday, May 18, 2017 12:45 PM
To: Mark Harris <email address hidden>
Subject: [Bug 1605798] Re: Unity + Skylake + Hyper-V xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted)

@Mark Harris, it's been a while since the last comment. Does this bug still exist with the lastest updates?

** Tags added: kernel-da-key

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Title:
  Unity + Skylake + Hyper-V xf86EnableIOPorts: failed to set IOPL for
  I/O (Operation not permitted)

Status in xorg package in Ubuntu:
  Confirmed

Bug description:
  Customer using Lenovo P50 (Skylake) and Surface Book (Skylake) laptops
  tried to start unity in a guest VM on Hyper-V. Kernel 4.4.0-31 started
  as expected, Hyper-V drivers loaded as expected including the
  framebuffer driver, plenty of memory and vCPUs allocated, but x.org
  fails with xf86EnableIOPorts: failed to set IOPL for I/O (Operation
  not permitted), resulting in "no screens found".

  However, when customer used KDE (kubuntu 16.04 with similar kernel) on
  these same systems got a UI as expected. Customer also has no issues
  on non-skylake laptop.

  No unexpected messages seen in dmesg and syslog.

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[Joseph Salisbury (jsalisbury)]

Thanks for the update, Mark. Would you say this bug is resolved?