On 09/12/2016 02:12 PM, Sylviane Molinet wrote:
> After last upgrade from SL6.7 to SL 6.8, nvidia driver from ELrepo 
> does not work properly with Cadence PCB. (Allegro)
> On opening Cadence PCB we get a white window instead of a black one 
> with a grid.
> Is this an OpenGL issue ?
> Below package installed :
> kmod-nvidia-367.44-1.el6.elrepo.x86_64
> nvidia-detect-367.44-1.el6.elrepo.x86_64
> yum-plugin-nvidia-1.0.2-1.el6.elrepo.noarch
> nvidia-x11-drv-367.44-1.el6.elrepo.x86_64
>
> kernel Linux 2.6.32-642.4.2.el6.x86_64
>
> Downloading driver from nvidia and rebuilding for new kernel works 
> fine for PCB.
> Thanks in advance for support.
>
I uninstalled nvidia driver with nvidia-uninstall then I installed 
driver from ELrepo.
kmod-nvidia-340xx-340.96-1.el6.elrepo.x86_64
nvidia-detect-367.44-1.el6.elrepo.x86_64
nvidia-x11-drv-340xx-340.96-1.el6.elrepo.x86_64
nvidia-x11-drv-340xx-32bit-340.96-1.el6.elrepo.x86_64

To get more output while starting Allegro :

setenv LIBGL_DEBUG verbose

libGL: screen 0 does not appear to be DRI2 capablee
libGL: OpenDriver: trying /usr/lib/dri/tls/swrast_dri.so
libGL: OpenDriver: trying /usr/lib/dri/swrast_dri.so
libGL error: dlopen /usr/lib/dri/swrast_dri.so failed 
(/usr/lib/libLLVM-3.6-mesa.so: symbol 
_ZNSt15__exception_ptr13exception_ptrC1Ev, version CXXABI_1.3.3 not 
defined in file libstdc++.so.6 with link time reference)
libGL error: unable to load driver: swrast_dri.so
libGL error: failed to load driver: swrast
Termination codes: exit=3, signal=11, errno=11

adding /usr/lib/nvidia to LD_LIBRARY_PATH fixed the error
I hope this will be useful for Allegro PCB Designer.

Sylviane Molinet