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[Bug Watch Updater <1209008@xxxxxxxxxxxxxxxxxx>]

** Changed in: xorg-server
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1209008

Title:
  X fails to detect certain video cards on non-seat0 seats

Status in X.Org X server:
  Fix Released
Status in “xorg-server” package in Ubuntu:
  Confirmed
Status in Fedora:
  Unknown

Bug description:
  From <https://bugs.freedesktop.org/show_bug.cgi?id=66851>:

  > I have a multiseat setup with a primary on-board Intel graphics
  > device and a secondary Silicon Motion SM501 graphics card. My SM501
  > is configured via custom xorg.conf with siliconmotion ddx driver, so
  > it exposes no framebuffer devices to e.g. systemd-logind. The same
  > situation is seen e.g. for a NVIDIA graphics card with proprietary
  > drivers.
  > 
  > Every time I configure my system to assign my SM501 card with a
  > secondary seat, i.e. not seat0, my X server fails to start,
  > returning a "No devices detected" error. Nevertheless, when I assign
  > my SM501 card with seat0 and attach my Intel graphics device to
  > secondary seat (via loginctl), both seats load successfully.
  > 
  > Investigating the Xorg-server sources, I've found something related
  > to "platform bus". I don't know what is it at all, but whatever it
  > means, my Intel graphics card with its open-source drivers implement
  > it, but my siliconmotion driver doesn't.
  > 
  > In its current form, Xorg-server probes for platform bus devices as
  > well as "legacy" PCI bus ones only for seat0. For other seats, it
  > only probes for platform bus devices, hence it never reaches my
  > SM501 card, returning that "No devices found" error.
  > 
  > I don't know if there's a good reason for probing only platform bus
  > devices on non-seat0 seats, but this brings a problem for multiseat
  > setups like mine.

  This same problem was encoutered by a user with two NVIDIA cards; see
  bug #976124.

  A patch was supplied to the upstream bug report, and this patch seems
  to fix the problem.

  Note that this bug only affects detection of cards when X is passed
  the '-seat' argument with a seat name OTHER than "seat0".  Thus, this
  only happens in multiseat setups.

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