Nouveau - Dec 2008 - [Bug 19223] New: Exit code of X-Windows restart is always failure

http://bugs.freedesktop.org/show_bug.cgi?id=19223

           Summary: Exit code of X-Windows restart is always failure
           Product: xorg
           Version: git
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: skliarie at gmail.com
         QAContact: xorg-team at lists.x.org


ubuntu 8.10 has a nice feature of switching users using fast-user-switch. If I
understand correctly, it somehow stops the current X-Windows server without
destroying already open windows, and then starts the new X-Windows server, on
behalf of user you want to switch to.

For some reason, stopping of Nouveau-powered X-Server always returns faulure,
with following error message in /var/log/Xorg.0.log

Fatal server error:
xf86OpenConsole: VT_WAITACTIVE failed: Interrupted system call

Because of that, the fast-user-switch never proceeds to second part of starting
another X-Windows, and instead returns to the previous X session with obscure
error about inability to start X-Windows.

Card: 
01:00.0 VGA compatible controller: nVidia Corporation NV34 [GeForce FX 5200]
(rev a1)

driver: xserver-xorg-video-nouveau 1:0.0.10~git20081124-0~ppa1


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http://bugs.freedesktop.org/show_bug.cgi?id=19223





--- Comment #1 from Arie Skliarouk <skliarie at gmail.com>  2008-12-21
13:32:42 PST ---
I think I have misunderstood the way the fast user switching works...

Turns out the system starts separate X-Windows server just for the new user. In
case of Nouveau, the Xorg.20.log shows following error message:

...
drmOpenDevice: open result is 10, (OK)
drmOpenByBusid: drmOpenMinor returns 10
drmOpenByBusid: drmGetBusid reports pci:0000:01:00.0
(II) [drm] DRM interface version 1.0
(EE) [drm] Could not set DRM device bus ID.
(EE) NOUVEAU(0): [dri] DRIScreenInit failed.  Disabling DRI.

Fatal server error:
AddScreen/ScreenInit failed for driver 0

And the fast switch fails with error of unability to start X-server.


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Pekka Paalanen <pq at iki.fi> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Exit code of X-Windows      |Parallel X servers do not
                   |restart is always failure   |work




--- Comment #2 from Pekka Paalanen <pq at iki.fi>  2008-12-21 14:19:02 PST
---
Currently Nouveau does not support multiple X servers running parallel. Nouveau
requires DRM/DRI support, and the X server needs to get to be the DRI master
for that. This would require multi-master support throughout the graphics
stack, and it is still under development. This is not (yet) a Nouveau-specific
bug, Nouveau is just the only driver that refuses to start a second X server at
all (other drivers only miss DRI support on other X servers).

Changed the summary to a little more descriptive.


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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #3 from Ilia Mirkin <imirkin at alum.mit.edu> ---
It appears that this bug report has laid dormant for quite a while. Sorry we
haven't gotten to it. Since we fix bugs all the time, chances are pretty
good
that your issue has been fixed with the latest software. Please give it a shot.
(Linux kernel 3.10.7, xf86-video-nouveau 1.0.9, mesa 9.1.6, or their git
versions.) If upgrading to the latest isn't an option for you, your
distro's
bugzilla is probably the right destination for your bug report.

In an effort to clean up our bug list, we're pre-emptively closing all bugs
that haven't seen updates since 2011. If the original issue remains, please
make sure to provide fresh info, see http://nouveau.freedesktop.org/wiki/Bugs/
for what we need to see, and re-open this one.

Thanks,

The Nouveau Team

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