Is there any information on the issue with Gnome 3 explained below?
Is the method outlined below for the removal of the nouveau driver on
EL7, required by Nvidia CUDA, correct?
Yasha Karant
from below:
Gnome 3, the version that ships with RHEL 7, now requires
hardware-accelerated OpenGL, so it is necessary to run the window
manager in VirtualGL. Unfortunately, however, there are still some known
issues with doing this, and one of the known issues is that, when you
run the window manager in VirtualGL, you cannot subsequently launch 3D
apps from within the window manager without crashing it. Until this is
fixed, it will be necessary to use KDE Plasma or another window manager
with RHEL 7.
KDE Plasma requires an X proxy with support for the Composite, XFIXES,
Damage, and XKEYBOARD extensions, so if you are running TurboVNC, you
will need to install the 2.0 pre-release rather than 1.2.x.
http://www.virtualgl.org/Documentation/RHEL6
As root:
Remove the X11 nouveau driver packages
rpm -e xorg-x11-drivers xorg-x11-drv-nouveau
RHEL 6: Add rdblacklist=nouveau nouveau.modeset=0 to the end of the
"kernel" line in /boot/grub.conf
RHEL 7: Add rdblacklist=nouveau to the end of the
"GRUB_CMDLINE_LINUX" line in /etc/default/grub and run:
grub2-mkconfig -o /boot/grub2/grub.cfg
Create a file /etc/modprobe.d/disable-nouveau.conf with the
following contents:
blacklist nouveau
options nouveau modeset=0
Reboot
Stop the X server (init 3)
Install the proprietary nVidia driver as you would normally
This will prompt you to install GCC and the kernel-devel
package if you haven't already done so. Be careful to install the
kernel-devel package that matches your running kernel. yum install
kernel-devel will pull in the latest & greatest update, which may not
match.
RHEL 6 and 7 have no xorg.conf file by default, so when the nVidia
installer asks whether you want to run nvidia-xconfig to modify your
xorg.conf file, answer Yes. This will create the xorg.conf file, which
you can then modify to suit your needs.
Restart the X server (init 5)
vglgenkey Issues
The vglgenkey script is run by the display manager in order to grant 3D
X Server access to members of the vglusers group when the server is
sitting at the login prompt. Unfortunately, this script encounters
problems under RHEL 6 whenever SELinux is enabled. Specifically, the
/usr/bin/xauth file is hidden within the context of the display manager
startup scripts, so vglgenkey has no way of generating or importing an
xauth key to /etc/opt/VirtualGL/vgl_xauth_key. Additionally, access is
denied to /etc/opt/VirtualGL.
After running vglserver_config, you can execute the following commands
(as root) to work around these issues:
semanage fcontext -a -t xdm_rw_etc_t '/etc/opt/VirtualGL(/.*)?'
restorecon -R -v /etc/opt/VirtualGL
semanage fcontext -a -t xdm_exec_t /usr/bin/xauth
restorecon -R -v /usr/bin/xauth
(Disabling SELinux works around the issues as well.)
If semanage is not installed, then run yum install
policycoreutils-python to install it.
vglserver_config Issues
There is currently no known way to disable the XTEST extension, because
gdmsetup no longer exists.
Issues with RHEL 7 Window Managers and X Proxies
Gnome 3, the version that ships with RHEL 7, now requires
hardware-accelerated OpenGL, so it is necessary to run the window
manager in VirtualGL. Unfortunately, however, there are still some known
issues with doing this, and one of the known issues is that, when you
run the window manager in VirtualGL, you cannot subsequently launch 3D
apps from within the window manager without crashing it. Until this is
fixed, it will be necessary to use KDE Plasma or another window manager
with RHEL 7.
KDE Plasma requires an X proxy with support for the Composite, XFIXES,
Damage, and XKEYBOARD extensions, so if you are running TurboVNC, you
will need to install the 2.0 pre-release rather than 1.2.x.
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