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[Bug 1209008] [NEW] X fails to detect certain video cards on non-seat0 seats

 

You have been subscribed to a public bug by a7x (a7x):

>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.

** Affects: xorg-server
     Importance: Medium
         Status: Confirmed

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: fedora
     Importance: Unknown
         Status: Unknown


** Tags: multiseat saucy
-- 
X fails to detect certain video cards on non-seat0 seats
https://bugs.launchpad.net/bugs/1209008
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