This happened to me installing an no-name generic Nvidia Quadro NVS 290
pci-x into a Dell Optilplex OptiPlex 210L 32 bit machine. (Dell service
tag FYF7Y91), which has an integrated Intel gpu using the i915 driver.
There is no way to 'disable' onboard video but you can 'autodetect'
added cards.
Public bug reported:
GLXGears does not run properly. It gives a message about a missing NV-
GLX extension. It runs massively slow, as though it were using software
rendering.
There is no Nvidia hardware in this machine. Info follows:
don@henbit:~/openscad$ glxgears
Xlib: extension NV-GLX
I believe that when I installed python-pyopencl it installed a bunch of
Nvidia stuff.
OpenCL shouldn't, in theory, depend on any particular graphics brand nor
should it break your X windows when you install it. IMHO
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I should note I was able to fix this by removing a bunch of nvidia stuff
(dpkg --list | grep nv ) and then reinstalling xorg-xserver stuff
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having this problem recently on 10.04 on logitech usb mouse.
found it even easier to verify with following command:
xev | grep state
clearly shows this for a single click:
state 0x10, button 1, same_screen YES
state 0x10, button 1, same_screen YES
state 0x110, button 1,
fixed by experimenting with system/preferences/mouse/left-hand and
right-hand, to verify it was left-mouse-button-hardware and not
software. then i cleaned my mouse. seems to have fixed it.
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