Sorry for the long reply, I just finished moving into a new place today. Anyways, using the opens source drivers fixes this issue, but they have much poorer performance and cause a host of other issues, including screen tearing. They simply will not work. After reinstalling the proprietary drivers, the issue comes back. Here is my X Server log file (/var/log/Xorg.0.log) after attempting to run minecraft and logging back in after it crashes/whatever (text to long, splitting into three posts):
[ 31.129]
X.Org X Server 1.13.3
Release Date: 2013-03-07
[ 31.129] X Protocol Version 11, Revision 0
[ 31.129] Build Operating System: 2.6.32-358.2.1.el6.x86_64
[ 31.129] Current Operating System: Linux bryan 3.9.6-200.fc18.x86_64 #1 SMP Thu Jun 13 18:56:55 UTC 2013 x86_64
[ 31.129] Kernel command line: BOOT_IMAGE=/vmlinuz-3.9.6-200.fc18.x86_64 root=/dev/mapper/vg_bryan-lv_root ro rd.md=0 rd.dm=0 SYSFONT=True rd.lvm.lv=vg_bryan/lv_swap KEYTABLE=us rd.lvm.lv=vg_bryan/lv_root rd.luks=0 LANG=en_US.UTF-8 rhgb quiet
[ 31.129] Build Date: 17 April 2013 04:51:09AM
[ 31.129] Build ID: xorg-x11-server 1.13.3-3.fc18
[ 31.129] Current version of pixman: 0.28.0
[ 31.129] Before reporting problems, check
http://wiki.x.org
to make sure that you have the latusingest version.
[ 31.129] Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 31.129] (==) Log file: "/var/log/Xorg.0.log", Time: Sun Jun 30 11:45:00 2013
[ 31.322] (==) Using config directory: "/etc/X11/xorg.conf.d"
[ 31.322] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[ 31.595] (==) No Layout section. Using the first Screen section.
[ 31.595] (==) No screen section available. Using defaults.
[ 31.595] (**) |-->Screen "Default Screen Section" (0)
[ 31.595] (**) | |-->Monitor "<default monitor>"
[ 31.595] (==) No device specified for screen "Default Screen Section".
Using the first device section listed.
[ 31.595] (**) | |-->Device "Videocard0"
[ 31.595] (==) No monitor specified for screen "Default Screen Section".
Using a default monitor configuration.
[ 31.595] (==) Automatically adding devices
[ 31.595] (==) Automatically enabling devices
[ 31.595] (==) Automatically adding GPU devices
[ 31.595] (==) FontPath set to:
catalogue:/etc/X11/fontpath.d,
built-ins
[ 31.595] (**) ModulePath set to "/usr/lib64/xorg/modules/extensions/catalyst,/usr/lib64/xorg/modules"
[ 31.595] (II) The server relies on udev to provide the list of input devices.
If no devices become available, reconfigure udev or disable AutoAddDevices.
[ 31.595] (II) Loader magic: 0x801d00
[ 31.595] (II) Module ABI versions:
[ 31.595] X.Org ANSI C Emulation: 0.4
[ 31.595] X.Org Video Driver: 13.1
[ 31.595] X.Org XInput driver : 18.0
[ 31.595] X.Org Server Extension : 7.0
[ 31.596] (--) PCI:*(0:1:0:0) 1002:6739:1682:3117 rev 0, Mem @ 0xd0000000/268435456, 0xfe9e0000/131072, I/O @ 0x0000c000/256, BIOS @ 0x????????/131072
[ 31.596] Initializing built-in extension Generic Event Extension
[ 31.596] Initializing built-in extension SHAPE
[ 31.596] Initializing built-in extension MIT-SHM
[ 31.596] Initializing built-in extension XInputExtension
[ 31.596] Initializing built-in extension XTEST
[ 31.596] Initializing built-in extension BIG-REQUESTS
[ 31.596] Initializing built-in extension SYNC
[ 31.596] Initializing built-in extension XKEYBOARD
[ 31.596] Initializing built-in extension XC-MISC
[ 31.596] Initializing built-in extension XINERAMA
[ 31.596] Initializing built-in extension XFIXES
[ 31.596] Initializing built-in extension RENDER
[ 31.596] Initializing built-in extension RANDR
[ 31.596] Initializing built-in extension COMPOSITE
[ 31.596] Initializing built-in extension DAMAGE
[ 31.596] Initializing built-in extension MIT-SCREEN-SAVER
[ 31.596] Initializing built-in extension DOUBLE-BUFFER
[ 31.596] Initializing built-in extension RECORD
[ 31.596] Initializing built-in extension DPMS
[ 31.596] Initializing built-in extension X-Resource
[ 31.596] Initializing built-in extension XVideo
[ 31.596] Initializing built-in extension XVideo-MotionCompensation
[ 31.596] Initializing built-in extension SELinux
[ 31.596] Initializing built-in extension XFree86-VidModeExtension
[ 31.596] Initializing built-in extension XFree86-DGA
[ 31.596] Initializing built-in extension XFree86-DRI
[ 31.596] Initializing built-in extension DRI2
[ 31.596] (II) "glx" will be loaded by default.
[ 31.596] (II) LoadModule: "dri2"
[ 31.596] (II) Module "dri2" already built-in
[ 31.596] (II) LoadModule: "glamoregl"
[ 31.787] (II) Loading /usr/lib64/xorg/modules/libglamoregl.so
[ 32.633] (II) Module glamoregl: vendor="X.Org Foundation"
[ 32.633] compiled for 1.13.3, module version = 0.5.0
[ 32.633] ABI class: X.Org ANSI C Emulation, version 0.4
[ 32.633] (II) LoadModule: "glx"
[ 32.633] (II) Loading /usr/lib64/xorg/modules/extensions/catalyst/libglx.so
[ 33.284] (II) Module glx: vendor="Advanced Micro Devices, Inc."
[ 33.284] compiled for 6.9.0, module version = 1.0.0
[ 33.284] Loading extension GLX
[ 33.284] (II) LoadModule: "fglrx"
[ 33.285] (II) Loading /usr/lib64/xorg/modules/drivers/fglrx_drv.so
[ 34.750] (II) Module fglrx: vendor="FireGL - AMD Technologies Inc."
[ 34.750] compiled for 1.4.99.906, module version = 12.10.5
[ 34.750] Module class: X.Org Video Driver
[ 34.750] (II) Loading sub module "fglrxdrm"
[ 34.750] (II) LoadModule: "fglrxdrm"
[ 34.750] (II) Loading /usr/lib64/xorg/modules/linux/libfglrxdrm.so
[ 34.758] (II) Module fglrxdrm: vendor="FireGL - AMD Technologies Inc."
[ 34.758] compiled for 1.4.99.906, module version = 12.10.5
[ 34.759] (II) AMD Proprietary Linux Driver Version Identifier:12.10.05
[ 34.759] (II) AMD Proprietary Linux Driver Release Identifier: 12.104
[ 34.759] (II) AMD Proprietary Linux Driver Build Date: Mar 28 2013 21:07:25
[ 34.759] (++) using VT number 1
[ 34.759] (WW) Falling back to old probe method for fglrx
[ 35.093] (II) Loading PCS database from /etc/ati/amdpcsdb /etc/ati/amdpcsdb.default
[ 35.128] ukiDynamicMajor: found major device number 247
[ 35.174] (--) Assigning device section with no busID to primary device
[ 35.174] (--) Chipset Supported AMD Graphics Processor (0x6739) found
[ 35.189] (WW) fglrx: No matching Device section for instance (BusID PCI:0@0:17:0) found
[ 35.189] (WW) fglrx: No matching Device section for instance (BusID PCI:0@0:18:0) found
[ 35.189] (WW) fglrx: No matching Device section for instance (BusID PCI:0@0:18:2) found
[ 35.189] (WW) fglrx: No matching Device section for instance (BusID PCI:0@0:19:0) found
[ 35.189] (WW) fglrx: No matching Device section for instance (BusID PCI:0@0:19:2) found
[ 35.189] (WW) fglrx: No matching Device section for instance (BusID PCI:0@0:20:0) found
[ 35.189] (WW) fglrx: No matching Device section for instance (BusID PCI:0@0:20:1) found
[ 35.189] (WW) fglrx: No matching Device section for instance (BusID PCI:0@0:20:2) found
[ 35.189] (WW) fglrx: No matching Device section for instance (BusID PCI:0@0:20:3) found
[ 35.189] (WW) fglrx: No matching Device section for instance (BusID PCI:0@0:20:4) found
[ 35.189] (WW) fglrx: No matching Device section for instance (BusID PCI:0@0:20:5) found
[ 35.189] (WW) fglrx: No matching Device section for instance (BusID PCI:0@0:21:0) found
[ 35.189] (WW) fglrx: No matching Device section for instance (BusID PCI:0@0:21:1) found
[ 35.189] (WW) fglrx: No matching Device section for instance (BusID PCI:0@0:22:0) found
[ 35.189] (WW) fglrx: No matching Device section for instance (BusID PCI:0@0:22:2) found
[ 35.189] (WW) fglrx: No matching Device section for instance (BusID PCI:0@1:0:1) found