black screen when close session

[Felipe Sampaio]

Every time I when I close a session, the screen becomes black and I need to restart the computer.

ProblemType: Bug
Architecture: i386
Date: Mon Mar 19 23:37:27 2007
DistroRelease: Ubuntu 7.04
Uname: Linux felipe 2.6.20-12-generic #2 SMP Sun Mar 18 03:07:14 UTC 2007 i686 GNU/Linux

[Brian Murray (brian-murray)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. Does this happen when you log out of a Gnome or a KDE session? Thanks in advance.

[Felipe Sampaio (fsilvasampaio)]

I use Gnome desktop.This happens when have two sessions started and when
close one for use other session, the screen appears black, the same one
occur when I have two sessions started, change the user, apperars the GDM
and I decide to return in the same session . I tried to restart the
GDM(using Ctr+Alt+Backspace), but don't solve, so restart my computer
clinking Crt+Alt+Del, but sometimes I need to turn off the pc. Tanks and
sorry, my english isn't perfect.

2007/3/20, Brian Murray <email address hidden>:
>
> Thanks for taking the time to report this bug and helping to make Ubuntu
> better. Does this happen when you log out of a Gnome or a KDE session?
> Thanks in advance.
>
> ** Changed in: Ubuntu
> Assignee: (unassigned) => Brian Murray
> Status: Unconfirmed => Needs Info
>
> --
> black screen when close session
> https://launchpad.net/bugs/93962
>

--
Felipe Sampaio

[Sebastien Bacher (seb128)]

What videocard and driver do you use?

[Felipe Sampaio (fsilvasampaio)]

I use a GeForce Fx 5200 with nvidia-glx driver.

2007/3/22, Sebastien Bacher <email address hidden>:
>
> What videocard and driver do you use?
>
> ** Changed in: gdm (Ubuntu)
> Importance: Undecided => Medium
> Status: Unconfirmed => Needs Info
>
> --
> black screen when close session
> https://launchpad.net/bugs/93962
>

--
Felipe Sampaio

[Sebastien Bacher (seb128)]

does it happen using the open source nvidia driver?

[Felipe Sampaio (fsilvasampaio)]

I used only this open source drive(nvidia-glx) on my pc.

2007/3/22, Sebastien Bacher <email address hidden>:
>
> does it happen using the open source nvidia driver?
>
> --
> black screen when close session
> https://launchpad.net/bugs/93962
>

--
Felipe Sampaio

[Sebastien Bacher (seb128)]

nvidia-glx is the closed source binary driver

[Khristian Alexander Schönrock (der-kosak)]

i'm having the same problem. i just need to start my pc, log in, and then close the session. the screen will go blank, and ctrl-alt-del or anything like that won't work. I have to restart the pc to be able to log in again.
But I'm using a Radeon XPress 1100 with the proprietary driver.
TIA,
Khristian

[Richard Andreu (randreu)]

Same problem here. I'm using nvidia-glx driver on Feisty. The steps that produce the issue for me are:

1.- Log in as user A
2.- Press 'Switch User'
3.- Log in as user B. At this point, both sessions, A and B are active
4.- Close session B

Then the screen goes blank. I can't close a session if there's another session active

[Felipe Sampaio (fsilvasampaio)]

I've this same problem and so far no solution. Always that appears the black
screen I need to restart the GDM.

2007/5/23, Richard Andreu <email address hidden>:
>
> Same problem here. I'm using nvidia-glx driver on Feisty. The steps that
> produce the issue for me are:
>
> 1.- Log in as user A
> 2.- Press 'Switch User'
> 3.- Log in as user B. At this point, both sessions, A and B are active
> 4.- Close session B
>
> Then the screen goes blank. I can't close a session if there's another
> session active
>
> --
> black screen when close session
> https://bugs.launchpad.net/bugs/93962
> You received this bug notification because you are a direct subscriber
> of the bug.
>

--
Felipe Sampaio

[Sitsofe Wheeler (sitsofe)]

Felipe:
Can you test whether this problem happens when you use the open source nv driver? You will need for the Driver section to say "nv" under the Section "Device" part of the /etc/X11/xorg.conf file and for X to be restarted before you will be running the open source nv driver.

[Richard Andreu (randreu)]

Well, after a couple of tests I found that the problem, at least in mi case, has to do with Beryl and
not with GDM. If I repeat the steps posted above (see my previous post) using Beryl as the window
manager, what happens is that the screen asking for the password to unlock the active session of
user A goes blank. But even though the screen is blank I can type my password, press enter and
return to the opened session. If I do the steps using Metacity, I have no problems at all.

[Felipe Sampaio (fsilvasampaio)]

My section for the video drive of my xorg.conf is

Section "Device"
    Identifier "NVIDIA GeForce FX 5200"
    Driver "nvidia"
    BusID "PCI:1:0:0"
    VideoRam 128000
    Option "AddARGBGLXVisuals" "True"
EndSection

And I'm using Metacity

2007/5/24, Richard Andreu <email address hidden>:
>
> Well, after a couple of tests I found that the problem, at least in mi
> case, has to do with Beryl and
> not with GDM. If I repeat the steps posted above (see my previous post)
> using Beryl as the window
> manager, what happens is that the screen asking for the password to unlock
> the active session of
> user A goes blank. But even though the screen is blank I can type my
> password, press enter and
> return to the opened session. If I do the steps using Metacity, I have no
> problems at all.
>
> --
> black screen when close session
> https://bugs.launchpad.net/bugs/93962
> You received this bug notification because you are a direct subscriber
> of the bug.
>

--
Felipe Sampaio

[Sitsofe Wheeler (sitsofe)]

Felipe:
You are currently using the NVIDIA binary driver and we need you to report the what result you get open source nv driver at least once so that this bug can be filed in the right place. Can you temporarily change
Driver "nvidia"
to
Driver "nv"
in /etc/X11/xorg.conf and then reboot and retest the problem? When you are done change it back to nvidia to start using the binary driver again.

[tasadar_f (tasadarf)]

I have similar bug with Ubuntu 7.04 + driver "ati" or "fglrx"

Step to reproduce error:
1- Login user "A"
2- change to user "B" (both session are open "A" & "B")
3- User B use PC more than 1 min.
4- Click logout button or change user botton "system hang"

Hang with driver "Ati" or "fglrx" the only diference is:

With driver "ati" all system hang and screen freeze
with driver "fglrx" all system hang and the screen goes black

[Sitsofe Wheeler (sitsofe)]

(Subscribed tasadar_f)

tasadar_f:
I suspect your issue is different. Try searching for a similar issue but relating to ati/fglrx . If nothing turns up please file a new bug report...

[Felipe Sampaio (fsilvasampaio)]

Sitsofe:

I changed the driver on xorg.conf, and the nv driver(instead nvidia) don't
have any problem, don't appears black screen wen close a sesion or changing
the user. So I believe that the problem is in the binary driver.

Thanks,

--
Felipe Sampaio

[Simon Taupenas (s1057802)]

I have the same problem with : Vidia Corporation G72M [Quadro NVS 110M/GeForce Go 7300]
Like Felipe Sampaio I change the driver in xorg.conf to nv instead of nvidia and it solve the problem but it disable automaticaly the desktop effects. Then I change again to nvidia and disable manually desktop effects. It works too. So this bug appears on my computer only when enabling desktop effects using nvidia proprietary driver.
Hope it helps.

[Felipe Sampaio (fsilvasampaio)]

I tested here , and the results is like Simon( I'm using the nv driver). I
think that the problem is in the desktop efects. Wen it disabled using the
nv driver, I changing the user or closing a session works. But wen I enabled
the desktop effects using the nv driver the same problem appears.

2007/5/28, Simon Taupenas <email address hidden>:
>
> I have the same problem with : Vidia Corporation G72M [Quadro NVS
> 110M/GeForce Go 7300]
> Like Felipe Sampaio I change the driver in xorg.conf to nv instead of
> nvidia and it solve the problem but it disable automaticaly the desktop
> effects. Then I change again to nvidia and disable manually desktop effects.
> It works too. So this bug appears on my computer only when enabling desktop
> effects using nvidia proprietary driver.
> Hope it helps.
>
> --
> black screen when close session
> https://bugs.launchpad.net/bugs/93962
> You received this bug notification because you are a direct subscriber
> of the bug.
>

--
Felipe Sampaio

[Sitsofe Wheeler (sitsofe)]

Simon:
Your issue is almost certainly Bug #96240 . You may want to try the workaround listed there.

Felipe:
Desktop-effects does not work with the open source nv driver (I would imagine trying to enable it would send your screen white or black). Remember you need to restart X (or better yet reboot) when switching from one to the other. If your 3D is fast and you're using an NVIDIA card then the odds are you are not using the open source nv driver.

Simon/Felipe:
Does following the steps mentioned in https://bugs.launchpad.net/ubuntu/+bug/96240/comments/28 make any difference?

[Felipe Sampaio (fsilvasampaio)]

Sitsofe:
You're right about the desktop effects, it's don't work with nv driver. and
about the link that you recommended, don't works here. This message appears
on terminal:

felipe@felipe:~$ gconftool -s
/apps/compiz/general/screen0/options/sync_to_vblank-t boolean false
A type must be specified when attributing a value

2007/5/28, Sitsofe Wheeler <email address hidden>:
>
> Simon:
> Your issue is almost certainly Bug #96240 . You may want to try the
> workaround listed there.
>
> Felipe:
> Desktop-effects does not work with the open source nv driver (I would
> imagine trying to enable it would send your screen white or black). Remember
> you need to restart X (or better yet reboot) when switching from one to the
> other. If your 3D is fast and you're using an NVIDIA card then the odds are
> you are not using the open source nv driver.
>
> Simon/Felipe:
> Does following the steps mentioned in
> https://bugs.launchpad.net/ubuntu/+bug/96240/comments/28 make any
> difference?
>
> --
> black screen when close session
> https://bugs.launchpad.net/bugs/93962
> You received this bug notification because you are a direct subscriber
> of the bug.
>

--
Felipe Sampaio

[Sitsofe Wheeler (sitsofe)]

Felipe:
There needs to be a space between -t and vblank . My bad....

Can you also indicate whether the problem goes way if you temporarily disable desktop effects?

[Felipe Sampaio (fsilvasampaio)]

Disabling desktop effects the problem disappear. The GDM works without
problems.

2007/5/29, Sitsofe Wheeler <email address hidden>:
>
> Felipe:
> There needs to be a space between -t and vblank . My bad....
>
> Can you also indicate whether the problem goes way if you temporarily
> disable desktop effects?
>
> --
> black screen when close session
> https://bugs.launchpad.net/bugs/93962
> You received this bug notification because you are a direct subscriber
> of the bug.
>

--
Felipe Sampaio

[Sitsofe Wheeler (sitsofe)]

Felipe:
Does disabling vblank using
gconftool -s /apps/compiz/general/screen0/options/sync_to_vblank -t boolean false
and having desktop effects on also solve the problem?

[Sebastien Bacher (seb128)]

We are closing this bug report as it lacks the information, described in the previous comments, we need to investigate the problem further. However, please reopen it if you can give us the missing information and don't hesitate to submit bug reports in the future.