Bug#801655: xorg crashes with "NOUVEAU(0): failed to set mode: Permission denied" when exiting tty2-6 shell

[Alexandre Hoïde <alexandre.hoide@gmail.com>]

On Tue, Oct 13, 2015 at 09:16:17PM +0200, Sven Joachim wrote:
> On 2015-10-13 05:13 +0200, Alexandre Hoïde wrote:
> 
> >    * What led up to the situation?
> >    1. Boot to multi-user.target as [default] systemd target;
> >    2. login to tty1 and 'startx' with following ~/.xsession :
> >         xrdb -merge ~/.Xresources
> >         exec /usr/bin/xmonad
> >    3. switch and login to any of tty2-6 (CTRL-ALT-Fx), then 'exit' from
> >    shell (bash) on this tty;
> >    4. xorg crashes with :
> > -----------------------------------------------------------------------
> > […]
> > [  6629.597] (II) AIGLX: Suspending AIGLX clients for VT switch
> > [  6629.597] (II) NOUVEAU(0): NVLeaveVT is called.
> > [  6629.783] (II) systemd-logind: got pause for 13:66
> > […]
> > [  6635.892] (II) systemd-logind: got resume for 226:0
> > [  6636.046] (II) AIGLX: Resuming AIGLX clients after VT switch
> > [  6636.046] (II) NOUVEAU(0): NVEnterVT is called.
> > [  6636.047] (EE) NOUVEAU(0): failed to set mode: Permission denied
> > [  6636.049] (EE) 
> > Fatal server error:
> > [  6636.049] (EE) EnterVT failed for screen 0
> > [  6636.049] (EE) 
> > [  6636.049] (EE) 
> > […]
> > [  6636.049] (EE) 
> > [  6636.049] (II) AIGLX: Suspending AIGLX clients for VT switch
> > [  6636.049] (II) NOUVEAU(0): NVLeaveVT is called.
> > [  6636.059] (EE) Server terminated with error (1). Closing log file.
> > -----------------------------------------------------------------------
> >      
> >    * Workaround :
> >      - No such problem when launching 'startx' from any of tty2-6.
> >      - No such problem with Gnome (residing on vt8, gdm vt7)
> >
> >    Sorry if this is not related to nouveau driver and regards,
> 
> I don't think this has anything to do with nouveau, rather I suspect the
> X server which no longer runs suid root.  See bug #801518 for a similar
> problem.
> 
> Anyway, you could try the modesetting driver, you would need this
> minimal /etc/X11//etc/X11/xorg.conf to use it:
> 
> --8<---------------cut here---------------start------------->8---
> Section "Device"
> 	Identifier	"n"
> 	Driver		"modesetting"
> EndSection
> --8<---------------cut here---------------end--------------->8---
> 
> Cheers,
>        Sven

  Thank you Sven,

  I'll [try to] reassign to xserver-xorg then. Although #801518 does
have similarities, I am unsure if it should be merged.

  I have tried the xorg.conf you suggested, and I hit another problem :
same sequence now leads to
-----------------------------------------------------------------------
[…]
FatalError re-entered, aborting
[   480.355] (EE) xf86CloseConsole: VT_ACTIVATE failed: Input/output error
[   480.355] (EE) 
-----------------------------------------------------------------------
(mouse/keyboard unresponsive although laptop "fn" keys does respond)
same workaround ('startx' from any of tty2-6)

  Regards,
  Alexandre Hoïde