Created attachment 82298 [details]
lspci, Xorg.*.log, dmesg

Xorg exhibits 3 problems possibly because of Dual 4550 Radeon cards.
1) (this bug report)  Xorg -configure   ends with segmentation violation.
2) Not using mode "1920x1080" (height too large for virtual size).
3) (after #2 is fixed)  xrandr -q   lists only one card.
(search for me duanev@gmail.com to find other possibly related bug reports)


# uname -a
Linux lavoe 3.9.9-1-ARCH #1 SMP PREEMPT Wed Jul 3 22:45:16 CEST 2013 x86_64 GNU/Linux
# pacman -Q ...
xorg-server 1.14.2-2
xorg-server-common 1.14.2-2
ati-dri 9.1.4-3
xf86-video-ati 1:7.1.0-3


# Xorg :1 -configure
X.Org X Server 1.14.2
Release Date: 2013-06-25
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.9.7-1-ARCH x86_64
Current Operating System: Linux lavoe 3.9.8-1-ARCH #1 SMP PREEMPT Thu Jun 27 21:37:31 CEST 2013 x86_64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-linux root=UUID=e689f6d7.... ro quiet
Build Date: 01 July 2013  10:48:42AM

Current version of pixman: 0.30.0
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.1.log", Time: Wed Jul 10 10:58:58 2013
List of video drivers:
ati
radeon
(++) Using config file: "/root/xorg.conf.new"
(==) Using config directory: "/etc/X11/xorg.conf.d"
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
(II) [KMS] Kernel modesetting enabled.
(II) [KMS] Kernel modesetting enabled.
(EE)
(EE) Backtrace:
(EE) 0: Xorg (xorg_backtrace+0x3d) [0x57f71d]
(EE) 1: Xorg (0x400000+0x183489) [0x583489]
(EE) 2: /usr/lib/libpthread.so.0 (0x7f97d7fb1000+0xf0e0) [0x7f97d7fc00e0]
(EE) 3: /usr/lib/xorg/modules/drivers/radeon_drv.so (0x7f97d4057000+0x440b4) [0x7f97d409b0b4]
(EE) 4: Xorg (DoConfigure+0xd46) [0x469426]
(EE) 5: Xorg (0x400000+0x7869a) [0x47869a]
(EE) 6: Xorg (0x400000+0x266d0) [0x4266d0]
(EE) 7: /usr/lib/libc.so.6 (__libc_start_main+0xf5) [0x7f97d6e2ca15]
(EE) 8: Xorg (0x400000+0x26bfd) [0x426bfd]
(EE)
(EE) Segmentation fault at address 0x18
(EE)
Fatal server error:
(EE) Caught signal 11 (Segmentation fault). Server aborting