The other possible value is no value at all.  VirtualGL doesn't use
libGLX, so you shouldn't set that environment variable.

On 2/14/20 4:07 PM, Marcello Blancasio wrote:
> I'm doing that to select nvidia dispatch in libGLX: it works fine with
> glxinfo.
> The other possible value is "mesa" but it makes display :0 fallback to
> glx indirect rendering.
>
> Il Ven 14 Feb 2020, 21:33 DRC <[email protected]
> <mailto:[email protected]>> ha scritto:
>
>     Why are you setting __GLX_VENDOR_LIBRARY_NAME?  That seems to be the
>     source of the problem.
>
>     On 2/14/20 12:59 PM, Marcello Blancasio wrote:
>     > # cat /etc/redhat-release
>     > CentOS Linux release 7.7.1908 (Core)
>     >
>     > # rpm -qa VirtualGL
>     > VirtualGL-2.6.3-20191024.x86_64
>     >
>     > # rpm -qa \*chrome\*
>     > google-chrome-stable-79.0.3945.130-1.x86_64
>     >
>     > # rpm -qa \*mesa\*
>     > mesa-libEGL-devel-18.3.4-5.el7.x86_64
>     > mesa-private-llvm-3.9.1-3.el7.x86_64
>     > mesa-libgbm-18.3.4-5.el7.x86_64
>     > mesa-dri-drivers-18.3.4-5.el7.x86_64
>     > mesa-libGLU-9.0.0-4.el7.x86_64
>     > mesa-libxatracker-18.3.4-5.el7.x86_64
>     > mesa-libGLES-devel-18.3.4-5.el7.x86_64
>     > mesa-filesystem-18.3.4-5.el7.x86_64
>     > mesa-libGL-18.3.4-5.el7.x86_64
>     > mesa-debuginfo-18.3.4-5.el7.x86_64
>     > mesa-libEGL-18.3.4-5.el7.x86_64
>     > mesa-libGLES-18.3.4-5.el7.x86_64
>     > mesa-khr-devel-18.3.4-5.el7.x86_64
>     > mesa-libglapi-18.3.4-5.el7.x86_64
>     > mesa-libGLU-debuginfo-9.0.0-4.el7.x86_64
>     > mesa-libGL-devel-18.3.4-5.el7.x86_64
>     >
>     > # rpm -qa \*nvidia\*
>     > yum-plugin-nvidia-1.0.2-1.el7.elrepo.noarch
>     > nvidia-x11-drv-libs-430.50-1.el7_7.elrepo.x86_64
>     > kmod-nvidia-430.50-1.el7_7.elrepo.x86_64
>     > nvidia-detect-430.40-1.el7.elrepo.x86_64
>     > nvidia-x11-drv-430.50-1.el7_7.elrepo.x86_64
>     >
>     > I get different errors for NoMachine and TruboVNC.
>     >
>     > TurboVNC:
>     > [VGL] ERROR: in VirtualWin--
>     > [VGL]    75: Could not clone X display connection
>     > [VGL] ERROR: in VirtualWin--
>     > [VGL]    75: Could not clone X display connection
>     >
>     [13551:13:0214/185928.926089:ERROR:command_buffer_proxy_impl.cc(124)]
>     > ContextResult::kTransientFailure: Failed to send
>     > GpuChannelMsg_CreateCommandBuffer.
>     > [VGL] ERROR: in VirtualWin--
>     > [VGL]    75: Could not clone X display connection
>     >
>     [13551:13:0214/185929.197750:ERROR:command_buffer_proxy_impl.cc(124)]
>     > ContextResult::kTransientFailure: Failed to send
>     > GpuChannelMsg_CreateCommandBuffer.
>     >
>     > NoMachine:
>     > [11871:11871:0214/185332.795246:ERROR:gl_surface_glx.cc(129)] Failed
>     > to get GLXConfig
>     > [11871:11871:0214/185332.795435:ERROR:gl_surface_glx.cc(475)]
>     > CreateDummyWindow(gfx::GetXDisplay()) failed
>     > [11871:11871:0214/185332.795463:ERROR:gl_initializer_x11.cc(148)]
>     > GLSurfaceGLX::InitializeOneOff failed.
>     > [11871:11871:0214/185332.816002:ERROR:viz_main_impl.cc(180)] Exiting
>     > GPU process due to errors during initialization
>     >
>     > On 13/02/2020 00:15, DRC wrote:
>     >> I was unable to reproduce the issue on CentOS 7 with an nVidia
>     GPU or on
>     >> CentOS 8 with VMWare Tools.  Can you provide more details
>     regarding your
>     >> system?
>     >>
>     >> DRC
>     >>
>     >> On 1/28/20 11:13 AM, Marcello Blancasio wrote:
>     >>> Hello,
>     >>>
>     >>> I'm not able to run recent Chrome with GPU acceleration (
>     >>> google-chrome-stable.x86_64, version 79.0.3945.130-1,
>     installed from
>     >>> google-chrome repo):
>     >>>
>     >>> [6981:6981:0128/172712.708029:ERROR:gl_surface_glx.cc(129)]
>     Failed to
>     >>> get GLXConfig
>     >>> [6981:6981:0128/172712.708168:ERROR:gl_surface_glx.cc(475)]
>     >>> CreateDummyWindow(gfx::GetXDisplay()) failed
>     >>> [6981:6981:0128/172712.708199:ERROR:gl_initializer_x11.cc(148)]
>     >>> GLSurfaceGLX::InitializeOneOff failed.
>     >>> [6981:6981:0128/172712.712314:ERROR:viz_main_impl.cc(180)]
>     Exiting GPU
>     >>> process due to errors during initialization
>     >>>
>     [7007:12:0128/172712.894210:ERROR:command_buffer_proxy_impl.cc(124)]
>     >>> ContextResult::kTransientFailure: Failed to send
>     >>> GpuChannelMsg_CreateCommandBuffer.
>     >>>
>     >>> Chrome succeeds to start but chrome://gpu reports "Software
>     only" for
>     >>> WebGL/WebGL2.
>     >>>
>     >>> I also tried the workaround suggested here:
>     >>> https://github.com/VirtualGL/virtualgl/issues/73
>     >>>
>     >>> without success. I exported
>     VGL_DEFAULTFBCONFIG=GLX_ALPHA_SIZE,8 to
>     >>> the environment but nothing changed.
>     >>>
>     >>> -
>     >>> M.
>     >
>     >
>
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