[systemd-bugs] [Bug 78312] New: Microsoft Surface tablet detected as Virtual Machine through sysfs DMI string

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78312

          Priority: medium
            Bug ID: 78312
          Assignee: systemd-bugs at lists.freedesktop.org
           Summary: Microsoft Surface tablet detected as Virtual Machine
                    through sysfs DMI string
        QA Contact: systemd-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: reyad.attiyat at gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: general
           Product: systemd

Created attachment 98517
  --> https://bugs.freedesktop.org/attachment.cgi?id=98517&action=edit
[PATCH] Remove Microsft DMI string from virtual detection

I have a Microsoft Surface 2 table and it is being detected as a virtual
machine with the Visualization attribute set to "microsoft". It is my
understanding that Microsoft offers virtuosity support via Hyper-V, and systemd
detects for this by checking cpuinfo and /sys/class/dmi/id/ sysinfo strings. 

These heuristics incorrectly identity my device as a virtual machine because
the string "Microsoft Corporation\0" is found in /sys/class/dmi/id/board_vendor
and sys_vendor.

I have attached the a patch that removes this string from the array
dmi_vendor_table[]. Other possible solutions might be to send a kernel command
argument, or do more sophisticated DMI testing to ensure Hyper-V presence and
not a real hw device.

The only negative side effects I experienced by this bug were
gnome-settings-daemon would disable suspend but there might be other services
that act differently because of this.

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