Hi.
I recently installed Mandriva Spring 2010, and I've encountered a problem while setting up the xscreensaver. I (think I) turned off the kscreensaver in favor of xscreensaver. While I've had some other issues with the power save feature (solved now, I think), I now have an error written to my screen when the xscreensaver starts, which doesn't always go away....
Xlib: extension "GLX" missing on display ":0.0"
I've searched this forum and other places, and I'm still not certain what to do about this. Is this a driver problem?
My display card is a Geforce 6100 nvidia driver 195.36.24
There is a more recent driver, but the nvidia site cautions that my linux distribution may function better with the one supplied, rather than a newer one.
Any help or advice greatly appreciated in advance.
Ferrel

Since nobody else is coming to the fore...

As I understand it GLX is a library which can be loaded following a directive in Xorg.conf. I'll post an excerpt of mine:

Check whether you have sonthing comparable and post your results here.

Below is a copy of my current xorg.conf file


# File generated by XFdrake (rev )


Section "Monitor"
Identifier "monitor1"
VendorName "Plug'n Play"
ModelName "VX700"
HorizSync 30-86
VertRefresh 50-130

# TV fullscreen mode or DVD fullscreen output.
# 768x576 @ 79 Hz, 50 kHz hsync
ModeLine "768x576" 50.00 768 832 846 1000 576 590 595 630

# 768x576 @ 100 Hz, 61.6 kHz hsync
ModeLine "768x576" 63.07 768 800 960 1024 576 578 590 616
EndSection

Section "Device"
Identifier "device1"
VendorName "nVidia Corporation"
BoardName "NVIDIA GeForce 6100 to GeForce 360"
Driver "nvidia"
Option "DPMS"
Option "DynamicTwinView" "false"
Option "AddARGBGLXVisuals"
EndSection

Section "Screen"
Identifier "screen1"
Device "device1"
Monitor "monitor1"
DefaultColorDepth 8

Subsection "Display"
Depth 8
Modes "1280x960" "1152x864" "1024x768" "832x624" "800x600" "640x480" "48
0x360" "320x240"
EndSubsection

Subsection "Display"
Depth 15
Modes "1280x960" "1152x864" "1024x768" "832x624" "800x600" "640x480" "48
0x360" "320x240"
EndSubsection

Subsection "Display"
Depth 16
Modes "1280x960" "1152x864" "1024x768" "832x624" "800x600" "640x480" "48
0x360" "320x240"
EndSubsection

Subsection "Display"
Depth 24
Modes "1280x960" "1152x864" "1024x768" "832x624" "800x600" "640x480" "48
0x360" "320x240"
EndSubsection
EndSection
# File generated by XFdrake (rev )

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 1.0 (mandrake@klodia.mandriva.com) Tue May 4 23:38
:41 UTC 2010

# File generated by XFdrake (rev )
# File generated by XFdrake (rev )
# File generated by XFdrake (rev )
# **********************************************************************
# Refer to the xorg.conf man page for details about the format of
# this file.
# **********************************************************************

Section "ServerLayout"
Identifier "layout1"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
Screen "screen1"
EndSection

Section "Module"
Load "v4l" # Video for Linux
Load "glx"
EndSection

Section "ServerFlags"
Option "DontZap" "False" # disable <Ctrl><Alt><BS> (server abort)

# allows the server to start up even if the mouse does not work
#DontZoom # disable <Ctrl><Alt><KP_+>/<KP_-> (resolution switching)
Option "allowmouseopenfail"
EndSection

Section "InputDevice"
# generated from data in "/etc/sysconfig/keyboard"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
EndSection

Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
[ferrel@localhost ~]$ clear
[ferrel@localhost ~]$ cat /etc/X11/xo
xorg.conf xorg.conf.backup xorg.conf.old
[ferrel@localhost ~]$ cat /etc/X11/xorg.conf
# File generated by XFdrake (rev )


Section "Monitor"
Identifier "monitor1"
VendorName "Plug'n Play"
ModelName "VX700"
HorizSync 30-86
VertRefresh 50-130

# TV fullscreen mode or DVD fullscreen output.
# 768x576 @ 79 Hz, 50 kHz hsync
ModeLine "768x576" 50.00 768 832 846 1000 576 590 595 630

# 768x576 @ 100 Hz, 61.6 kHz hsync
ModeLine "768x576" 63.07 768 800 960 1024 576 578 590 616
EndSection

Section "Device"
Identifier "device1"
VendorName "nVidia Corporation"
BoardName "NVIDIA GeForce 6100 to GeForce 360"
Driver "nvidia"
Option "DPMS"
Option "DynamicTwinView" "false"
Option "AddARGBGLXVisuals"
EndSection

Section "Screen"
Identifier "screen1"
Device "device1"
Monitor "monitor1"
DefaultColorDepth 8

Subsection "Display"
Depth 8
Modes "1280x960" "1152x864" "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubsection

Subsection "Display"
Depth 15
Modes "1280x960" "1152x864" "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubsection

Subsection "Display"
Depth 16
Modes "1280x960" "1152x864" "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubsection

Subsection "Display"
Depth 24
Modes "1280x960" "1152x864" "1024x768" "832x624" "800x600" "640x480" "480x360" "320x240"
EndSubsection
EndSection
# File generated by XFdrake (rev )

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 1.0 (mandrake@klodia.mandriva.com) Tue May 4 23:38:41 UTC 2010

# File generated by XFdrake (rev )
# File generated by XFdrake (rev )
# File generated by XFdrake (rev )
# **********************************************************************
# Refer to the xorg.conf man page for details about the format of
# this file.
# **********************************************************************

Section "ServerLayout"
Identifier "layout1"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
Screen "screen1"
EndSection

Section "Module"
Load "v4l" # Video for Linux
Load "glx"
EndSection

Section "ServerFlags"
Option "DontZap" "False" # disable <Ctrl><Alt><BS> (server abort)

# allows the server to start up even if the mouse does not work
#DontZoom # disable <Ctrl><Alt><KP_+>/<KP_-> (resolution switching)
Option "allowmouseopenfail"
EndSection

Section "InputDevice"
# generated from data in "/etc/sysconfig/keyboard"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
EndSection

Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection

So you have a "Section Module" with a "load glx" directive. Please look into you /var/log/xorg.0.log search for errors there (lines starting with "(EE)") and post these here.

Here is the output:

(EE) Failed to initialize GLX extension (Compatible NVIDIA X driver not found)

Thanks for your help!

Here's a poor photo of the xscreensaver inaction, showing the problem;
the rectangular block of text in the upper left (hard to see) is the line
Xlib: extension "GLX" missing on display ":0.0"
repeated several times.
On some of the xscreensavers, there's no message; on others, it appears
very briefly, then disappears, while on others, it persists for the
duration of the screensaver cycle.
I hope this is useful.

Attached Thumbnails

 

Good morning. Well, you found the (next) problem: the "nvidia" driver. When I still used Nvidia, the driver was called "nv", but I had a very old video-card. You could try that one. It is the legacy driver without 3D support etc.

Do you have the closed source nvidia driver installed? If so that is not reflected in your xorg.conf either.

Is this problem confined to xscreensaver or does it concern all graphical output?

Hi! There is a problem with the display also, though I wasn't sure
the two were related. It's mostly apparent when I'm browsing web sites,
where some of the graphical features look distorted and washed out. However,
when I opened Gimp to take a screenshot, all of the icons and text were
distorted or unreadable, which I guess is a manifestation of this problem.

I have the Mandriva PowerPack distro, so I probably have the nvidia driver.
I'll try to install it (or uninstall and reinstall, whichever it is) and see
what happens. Unfortunately, this is a problem with my home computer, and I'll
be away from home until the Christmas holidays (next 3 weeks), so I won't be able
to do anything until then. Thanks very much for your help! I hope to continue
this when I get back home.
Ferrel

Should that not be the cure look at the logs first. If there is anything you can't resolve post it here (and the solution as well, of course ).

Will do....thanks again!