From: Bennion, Brian (
Date: Tue Mar 06 2018 - 15:01:16 CST

Wayland can be disabled in most FC27 setups be creating a custom.conf file in /etc/gdm/
However, laptops with the optimus (dual graphics cards) are painfully stuck in the middle.

less custom.conf
# GDM configuration storage

# Uncoment the line below to force the login screen to use Xorg



# Uncomment the line below to turn on debugging

-----Original Message-----
From: <> On Behalf Of Ivan Gregoretti
Sent: Tuesday, March 6, 2018 12:12 PM
To: iamcool777able . <>
Cc: vmd-l list <>
Subject: Re: vmd-l: VMD Segfault Fedora 27

Hello iamcool777able.

I am short of providing a solution but I would like to mention that Fedora 27 ships with XWayland. The last release with X11 was Fedora 25.

XWayland was adopted and X11 abandoned due to its many security vulnerabilities.

I haven't tried VMD on any distribution with XWayland but the time may have arrived.

Ivan Gregoretti, PhD
Computational Biology

On Tue, Mar 6, 2018 at 2:12 PM, iamcool777able .
<> wrote:
> Hello, I am having issues running VMD on Fedora 27. Running VMD in
> debug mode produces the following output:
> Starting program: /usr/local/lib/vmd/vmd_LINUXAMD64
> /usr/local/lib/vmd/vmd_LINUXAMD64: /lib64/ no version
> information available (required by /usr/local/lib/vmd/vmd_LINUXAMD64)
> [Thread debugging using libthread_db enabled] Using host libthread_db
> library "/lib64/".
> Info) VMD for LINUXAMD64, version 1.9.4a8 (August 30, 2017)
> Info)
> Info) Email questions and bug reports to
> Info) Please include this reference in published work using VMD:
> Info) Humphrey, W., Dalke, A. and Schulten, K., `VMD - Visual
> Info) Molecular Dynamics', J. Molec. Graphics 1996, 14.1, 33-38.
> Info) -------------------------------------------------------------
> Info) Multithreading available, 4 CPUs detected.
> Info) CPU features: SSE2 AVX AVX2 FMA
> Info) Free system memory: 4272MB (54%) [New Thread 0x7fffe9621700 (LWP
> 7152)] [New Thread 0x7fffe8e20700 (LWP 7153)] [New Thread
> 0x7fffe861f700 (LWP 7154)] [New Thread 0x7fffe7e1e700 (LWP 7155)]
> Info) No CUDA accelerator devices available.
> Warning) Detected X11 'Composite' extension: if incorrect display
> occurs
> Warning) try disabling this X server option. Most OpenGL drivers
> Warning) disable stereoscopic display when 'Composite' is enabled.
> Info) OpenGL renderer: Mesa DRI Intel(R) HD Graphics 620 (Kaby Lake GT2)
> Info) Full GLSL rendering mode is available.
> Info) Textures: 2-D (16384x16384), 3-D (512x512x512), Multitexture (8)
> Info) Dynamically loaded 2 plugins in directory:
> Info) /usr/local/lib/vmd/plugins/LINUXAMD64/molfile
> Thread 1 "vmd_LINUXAMD64" received signal SIGSEGV, Segmentation fault.
> XGetICValues (ic=0x0) at ICWrap.c:288
> 288 ICWrap.c: No such file or directory.
> Missing separate debuginfos, use: dnf debuginfo-install
> libdrm-2.4.89-1.fc27.x86_64 mesa-dri-drivers-17.2.4-3.fc27.x86_64
> mesa-libGL-17.2.4-3.fc27.x86_64 mesa-libglapi-17.2.4-3.fc27.x86_64
> pcre2-10.30-6.fc27.x86_64 sssd-client-1.16.0-5.fc27.x86_64
> I've tried installing the debugging packages VMD asks for but VMD
> doesn't seem to be able to find them even after I've installed the
> packages. Thanks in advance for the help; let me know if you need any further information.