Xorg crashed with SIGABRT in amd_xs113_int10_x_inb()

[LAZA]

started machine and all programms i need/use and left for some minutes.
after coming back the screen saver was active (i deactivated it), i had to enter my password and had this crash report.

Hardware:
Gigabyte GA-MA790GP-UD4H
AMD Phenom II X4 810
Gigabyte Radeon HD 6670 - GV-R667D3-2GI with fglrx-updates installed

.

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: xserver-xorg-core 2:1.15.0-1ubuntu7
ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
Uname: Linux 3.13.0-19-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
Date: Thu Mar 27 08:47:30 2014
ExecutablePath: /usr/bin/Xorg
InstallationDate: Installed on 2014-03-16 (10 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140225)
ProcCmdline: /usr/bin/X -core :1 -seat seat0 -auth /var/run/lightdm/root/:1 -nolisten tcp vt8 -novtswitch
ProcEnviron:

Signal: 6
SourcePackage: xorg-server
StacktraceTop:
 ?? () from /usr/lib/x86_64-linux-gnu/libpciaccess.so.0
 amd_xs113_int10_x_inb () from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/modules/drivers/fglrx_drv.so
 ?? () from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/modules/drivers/fglrx_drv.so
 X86EMU_exec () from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/modules/drivers/fglrx_drv.so
 amd_xs113_int10_xf86ExecX86int10 () from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/modules/drivers/fglrx_drv.so
Title: Xorg crashed with SIGABRT in amd_xs113_int10_x_inb()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[Apport retracing service (apport)]

StacktraceTop:
 inb (__port=963) at /usr/include/x86_64-linux-gnu/sys/io.h:47
 pci_device_linux_sysfs_read8 (handle=0x7f2bf99bc200, port=963) at ../../src/linux_sysfs.c:845
 ?? ()
 ?? ()
 ?? ()

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Alberto Salvia Novella (es20490446e)]

It affects an essential hardware component (disk controller, built-in networking, video card, keyboard, mouse).