X server restarts - I think - no regular intervals

Hi,
Just finished the installation of Arch on my new computer. The most important part of the new computer is the AMD HD7850 graphic card. I am running KDE.
When I first installed it, I had the KDE 4.9.5 on it. However, I noticed that after a certain amount of time, the X server simply restarts and I am thrown back into the KDM login window. Now I am not 100% sure that it is the X server crashing mostly because I don't see anything in Xorg.0.log.
I am using the latest (13.1) AMD's proprietary drivers. I enabled the kde-unstable repo and updated to 4.9.95 (I love it by the way), and while I find no bugs with KDE, the issue persists. I also downgraded the xserver to 1.12 (though 13.1 supposedly supports 1.13), but it still happens.
Now there's nothing in the Xorg log, but there's something in a file called kdm.log. Here:
Note that your system uses syslog. All of kdm's internally generated messages
(i.e., not from libraries and external programs/scripts it uses) go to the
daemon.* syslog facility; check your syslog configuration to find out to which
file(s) it is logged. PAM logs messages related to authentication to authpriv.*.
klauncher(379) kdemain: No DBUS session-bus found. Check if you have started the DBUS server.
kdeinit4: Communication error with launcher. Exiting!
kdmgreet(373)/kdecore (K*TimeZone*): KSystemTimeZones: ktimezoned initialize() D-Bus call failed: "Not connected to D-Bus server"
kdmgreet(373)/kdecore (K*TimeZone*): No time zone information obtained from ktimezoned
The XKEYBOARD keymap compiler (xkbcomp) reports:
> Warning: Type "ONE_LEVEL" has 1 levels, but <RALT> has 2 symbols
> Ignoring extra symbols
Errors from xkbcomp are not fatal to the X server
The XKEYBOARD keymap compiler (xkbcomp) reports:
> Warning: Type "ONE_LEVEL" has 1 levels, but <RALT> has 2 symbols
> Ignoring extra symbols
Errors from xkbcomp are not fatal to the X server
Backtrace:
0: /usr/bin/X (xorg_backtrace+0x36) [0x560366]
1: /usr/bin/X (0x400000+0x1640c9) [0x5640c9]
2: /usr/lib/libpthread.so.0 (0x7faeca7cb000+0xf1e0) [0x7faeca7da1e0]
3: /usr/lib/libpixman-1.so.0 (0x7faeca533000+0x82a70) [0x7faeca5b5a70]
4: /usr/lib/libpixman-1.so.0 (0x7faeca533000+0x50c7b) [0x7faeca583c7b]
5: /usr/lib/libpixman-1.so.0 (pixman_blt+0x52) [0x7faeca53e4b2]
6: /usr/lib/xorg/modules/libfb.so (fbCopyNtoN+0x2c9) [0x7faec625e649]
7: /usr/lib/xorg/modules/glesx.so (0x7faec42d8000+0x82101) [0x7faec435a101]
8: /usr/lib/xorg/modules/glesx.so (0x7faec42d8000+0x8429b) [0x7faec435c29b]
9: /usr/bin/X (0x400000+0xf2119) [0x4f2119]
10: /usr/bin/X (0x400000+0xbb005) [0x4bb005]
11: /usr/bin/X (0x400000+0xbbe56) [0x4bbe56]
12: /usr/bin/X (0x400000+0xba80c) [0x4ba80c]
13: /usr/bin/X (0x400000+0x5b666) [0x45b666]
14: /usr/bin/X (MapWindow+0x17c) [0x45e39c]
15: /usr/bin/X (0x400000+0x2ee50) [0x42ee50]
16: /usr/bin/X (0x400000+0x34531) [0x434531]
17: /usr/bin/X (0x400000+0x23615) [0x423615]
18: /usr/lib/libc.so.6 (__libc_start_main+0xf5) [0x7faec965ba15]
19: /usr/bin/X (0x400000+0x238ed) [0x4238ed]
Segmentation fault at address 0x7faeaed37f60
Fatal server error:
Caught signal 11 (Segmentation fault). Server aborting
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
Please also check the log file at "/var/log/Xorg.0.log" for additional information.
Server terminated with error (1). Closing log file.
klauncher(15848) kdemain: No DBUS session-bus found. Check if you have started the DBUS server.
kdeinit4: Communication error with launcher. Exiting!
kdmgreet(15829)/kdecore (K*TimeZone*): KSystemTimeZones: ktimezoned initialize() D-Bus call failed: "Not connected to D-Bus server"
kdmgreet(15829)/kdecore (K*TimeZone*): No time zone information obtained from ktimezoned
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
kded(15851): KUniqueApplication: Cannot find the D-Bus session server: "Address does not contain a colon"
kded(15850): KUniqueApplication: Pipe closed unexpectedly.
I am not versed into this, but I see that it's complaining about DBUS not running - I'm on systemd, shouldn't that mean that dbus must be running?
I would also like to emphasize that KDE is running fine and that the X restarts at no regular intervals - so sometimes after 5 minutes, some times after an hour, etc.
Before I try the OSS drivers, is there anything else I could try? According to the Radeon feature matrix, my card is very, very poorly supported.
Thanks in advance
Last edited by Deusdies (2013-01-20 23:54:52)

Well, I won't mark it as solved, since it still happens (even after downgrading pixman), albeit not nearly as often. Reading some forums online with the people having the same problem, everyone is reporting bizarre fixes (like one person mentioned the problem went away after he installed ttf-dejavu package).

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