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From: Andrea Neroni on 1 May 2010 10:30
> Hello,

>
> I recently switched back to the GNOME desktop environment from KDE and I'm interested in running Compiz Fusion,
> which I remember playing with when I was using the Ubuntu distribution. First thing I did was follow > the instructions
> outlined here:
>
> http://wiki.debian.org/Compiz
>
> And everything was going smoothly up until the compiz --replace command, which outputs:
>
> jason(a)debian:~$ compiz --replace
> compiz (core) - Fatal: glXCreateContext failed
> compiz (core) - Error: Failed to manage screen: 0
> compiz (core) - Fatal: No manageable screens found on display :0.0
>
> Launching fallback window manager
>
> Which is obviously metacity. I googled a bit but almost all forum posts I found regarded the Fedora > distribution. Here's one that didn't:
>
> http://www.nvnews.net/vbulletin/showthread.php?t=116895
>
> However, I'm not sure what I'm supposed to do to uninstall the NVIDIA driver (which I've installed > with the NVIDIA installer),
> since that guy says to do so in the sentence:
>
> "I uninstall NVIDIA driver have installed Nvidia way - not Debian way."
>
> So I'm still stuck. I ran the "compiz check" script hosted on "Forlon's blog" (http://forlong.blogage.de/entries/pages/Compiz-Check)
> and here's the output:
>
> jason(a)debian:~$ ./compiz-check
>
> Gathering information about your system...
>
> Distribution: Debian GNU/Linux (squeeze/sid)
> Desktop environment: GNOME
> Graphics chip: nVidia Corporation GT216 [GeForce GT 220] (rev a2)
> Driver in use: nvidia
> Rendering method: Nvidia
>
> Checking if it's possible to run Compiz on your system...
>
> Checking for texture_from_pixmap... [FAIL]
> Checking for non power of two support... [FAIL]
>
Checking for composite extension... [ OK ]
> Checking for FBConfig... [ OK ]
> Checking for hardware/setup problems... [SKIP]
>
> At least one check had to be skipped:
> Error: Unable to detect maximum 3D texture size
>
> jason(a)debian:~$
>
> This is an obvious problem, because after reading a little about compiz-fusion I understood that it's practically based on the
> openGL extension "texture_from_pixmap" which I, for some reason, lack.
>
> Before going ahead and doing something that might eliminate my ability to launch an X session, I thought I might resort to this list
> for the most up-to-date information as to what I should do. I am attaching my /etc/X11/xorg.conf, /var/log/Xorg.0.log as well as the full output of
> "glxinfo" so as to not clutter this message any further with their data. In xorg.conf you will notice that I have added dummy
> "Identifier" strings to all the xorg.conf sections that the wiki.debian article I linked to suggests that I add. This was done because my
> xorg.conf would not be parsed otherwise and I would be stuck with a terminal interface. The "startx" command complained about xorg.conf sections lacking
> "Identifier" strings.
>
> Thank you very much for your time and interest,
> Jason
>

This happened to me many times and I fixed it reinstalling the driver.
Seems that you are using official nvidia driver.
If it is you have a .run install file. What I usually make is to go to a shell, stop grphic session,
uninstall the driver, reinstall the driver and everything go smoothly.
So:

ctrl+alt+f1 // for a shell
log in using root
go to the place where you have the .run file (for me is /usr/src)

cd /usr/src
/etc/init.d/gdm stop
./name_of_driver.run --uninstall //uninstall driver
./name_of_driver.run -N //reinstal driver
/etc/init.d/gdm start

If the installation complain about the gcc compiler version used to compile your kernel
abort installation and:

export CC=/usr/bin/gcc-4.3

using the correct number version. If you are using Squueze up-to-date I think gcc-4.3
should be fine.

Andrea


From: Jason Filippou on 1 May 2010 11:20
On Sat, May 1, 2010 at 5:22 PM, Andrea Neroni <hellnote01-debian(a)yahoo.it>wrote:

> > Hello,
> >
> > I recently switched back to the GNOME desktop environment from KDE and
> I'm interested in running Compiz Fusion,
> > which I remember playing with when I was using the Ubuntu distribution.
> First thing I did was follow > the instructions
> > outlined here:
> >
> > http://wiki.debian.org/Compiz <http://wiki.debian.org/Compiz>
> >
> > And everything was going smoothly up until the compiz --replace command,
> which outputs:
> >
> > jason(a)debian:~$ compiz --replace
> > compiz (core) - Fatal: glXCreateContext failed
> > compiz (core) - Error: Failed to manage screen: 0
> > compiz (core) - Fatal: No manageable screens found on display :0.0
> >
> > Launching fallback window manager
> >
> > Which is obviously metacity. I googled a bit but almost all forum posts I
> found regarded the Fedora > distribution. Here's one that didn't:
> >
> > http://www.nvnews.net/vbulletin/showthread.php?t=116895<http://www.nvnews.net/vbulletin/showthread.php?t=116895>
> >
> > However, I'm not sure what I'm supposed to do to uninstall the NVIDIA
> driver (which I've installed > with the NVIDIA installer),
> > since that guy says to do so in the sentence:
> >
> > "I uninstall NVIDIA driver have installed Nvidia way - not Debian way."
> >
> > So I'm still stuck. I ran the "compiz check" script hosted on "Forlon's
> blog" (http://forlong.blogage.de/entries/pages/Compiz-Check)
> > and here's the output:
> >
> > jason(a)debian:~$ ./compiz-check
> >
> > Gathering information about your system...
> >
> > Distribution: Debian GNU/Linux (squeeze/sid)
> > Desktop environment: GNOME
> > Graphics chip: nVidia Corporation GT216 [GeForce GT 220] (rev
> a2)
> > Driver in use: nvidia
> > Rendering method: Nvidia
> >
> > Checking if it's possible to run Compiz on your system...
> >
> > Checking for texture_from_pixmap... [FAIL]
> > Checking for non power of two support... [FAIL]
> > Checking for composite extension... [ OK ]
> > Checking for FBConfig... [ OK ]
> > Checking for hardware/setup problems... [SKIP]
> >
> > At least one check had to be skipped:
> > Error: Unable to detect maximum 3D texture size
> >
> > jason(a)debian:~$
> >
> > This is an obvious problem, because after reading a little about
> compiz-fusion I understood that it's practically based on the
> > openGL extension "texture_from_pixmap" which I, for some reason, lack.
> >
> > Before going ahead and doing something that might eliminate my ability to
> launch an X session, I thought I might resort to this list
> > for the most up-to-date information as to what I should do. I am
> attaching my /etc/X11/xorg.conf, /var/log/Xorg.0.log as well as the full
> output of
> > "glxinfo" so as to not clutter this message any further with their data.
> In xorg.conf you will notice that I have added dummy
> > "Identifier" strings to all the xorg.conf sections that the wiki.debian
> article I linked to suggests that I add. This was done because my
> > xorg.conf would not be parsed otherwise and I would be stuck with a
> terminal interface. The "startx" command complained about xorg.conf sections
> lacking
> > "Identifier" strings.
> >
> > Thank you very much for your time and interest,
> > Jason
> >
>
> This happened to me many times and I fixed it reinstalling the driver.
> Seems that you are using official nvidia driver.
> If it is you have a .run install file. What I usually make is to go to a
> shell, stop grphic session,
> uninstall the driver, reinstall the driver and everything go smoothly.
> So:
>
> ctrl+alt+f1 // for a shell
> log in using root
> go to the place where you have the .run file (for me is /usr/src)
>
> cd /usr/src
> /etc/init.d/gdm stop
> ./name_of_driver.run --uninstall //uninstall driver
> ./name_of_driver.run -N //reinstal driver
> /etc/init.d/gdm start
>
> If the installation complain about the gcc compiler version used to compile
> your kernel
> abort installation and:
>
> export CC=/usr/bin/gcc-4.3
>
> using the correct number version. If you are using Squueze up-to-date I
> think gcc-4.3
> should be fine.
>
> Andrea
>
>
>
And, it worked! I feel stupid! Yay!

Thanks Andrea.
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