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After updating my ATI Radeon Mobility 9000 based laptop from Kubuntu
9.04 to 9.10 I have severe problems with the system. It seems to boot
correctly and even to switch to the native resolution (1400x1050) - but
it shows the error message

Ubuntu is running in low-graphics mode
Your screen, graphics card, and input device settings could not be detected 
correctly. You will need to configure these yourself.
Using different xorg.conf files (none, a version with "vesa", a version with 
"ati" or a version with "ati" and lots of detailed information) did't help


All that I can do is to select the option to go to the text console. Running 
"startx" there starts an KDE session just as I'd expect it to (compiz is 
unusable slow and has some big artefacts; disabling it, I can at least work 
with the system although it's feeling sluggish)

A hint for helping might be this parts of the /var/log/kdm.log:

X.Org X Server 1.6.4
Release Date: 2009-9-27
[...]
(II) [KMS] drm report modesetting isn't supported.
[...]
error setting MTRR (base = 0xd8000000, size = 0x04000000, type = 1) Invalid 
argument (22)
 ddxSigGiveUp: Closing log
frontend: cannot connect to X server
debconf: unable to initialize frontend: Kde
debconf: (DISPLAY problem?)
debconf: falling back to frontend: Dialog
debconf: unable to initialize frontend: Dialog
debconf: (TERM is not set, so the dialog frontend is not usable.)
debconf: falling back to frontend: Readline
debconf: unable to initialize frontend: Readline
debconf: (This frontend requires a controlling tty.)
debconf: falling back to frontend: Teletype
xinit /etc/gdm/failsafeXinit /etc/X11/xorg.conf.failsafe -- /usr/bin/X  -br 
-once -config /etc/X11/xorg.conf.failsafe -logfile /var/log/Xorg.failsafe.log


X.Org X Server 1.6.4
Release Date: 2009-9-27
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.24-23-server i686 Ubuntu
Current Operating System: Linux yoda 2.6.31-14-generic #48-Ubuntu SMP Fri Oct 
16 14:04:26 UTC 2009 i686
Kernel command line: root=UUID=2f7a1c63-c3e9-4e88-a42c-3cb97715bb6a ro quiet 
splash locale=de_DE
Build Date: 26 October 2009  05:15:02PM
xorg-server 2:1.6.4-2ubuntu4 (buildd@)
        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.failsafe.log", Time: Fri Oct 30 18:56:58 2009
(++) Using config file: "/etc/X11/xorg.conf.failsafe"

Fatal server error:
Server is already active for display 0
        If this server is no longer running, remove /tmp/.X0-lock
        and start again.


Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.

 ddxSigGiveUp: Closing log
Warning:  Failsafe mode was already attempted within 30 seconds.
Warning:  Falling back to gdm to report the issue.
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
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

Fatal server error:
Server is already active for display 0
        If this server is no longer running, remove /tmp/.X0-lock
        and start again.


Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.

 ddxSigGiveUp: Closing log
^M
waiting for X server to shut down
Backtrace:
0: /usr/bin/X(xorg_backtrace+0x3b) [0x8133d6b]
1: /usr/bin/X(xf86SigHandler+0x55) [0x80c7d35]
2: [0xe45400]
3: /usr/lib/xorg/modules//libshadow.so(shadowRemove+0x4e) [0x87ff2e]
4: /usr/lib/xorg/modules//libshadow.so [0x8803e4]
5: /usr/bin/X [0x80c6b3e]
6: /usr/bin/X [0x8111bac]
7: /usr/bin/X [0x811de9c]
8: /usr/bin/X [0x812439c]
9: /usr/bin/X [0x80cf6ce]
10: /usr/lib/xorg/modules/drivers//vesa_drv.so [0x5babb8]
11: /usr/bin/X [0x80c784c]
12: /usr/bin/X [0x816143e]
13: /usr/bin/X [0x80e17f5]
14: /usr/bin/X [0x80cc192]
15: /usr/bin/X [0x814a890]
16: /usr/bin/X [0x817bf49]
17: /usr/bin/X [0x8144516]
18: /usr/lib/xorg/modules/extensions//libglx.so [0x49ed0a]
19: /usr/bin/X(main+0x428) [0x80725a8]
20: /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe6) [0x1a6b56]
21: /usr/bin/X [0x80719c1]
Saw signal 11.  Server aborting.
 ddxSigGiveUp: Closing log
 ddxSigGiveUp: re-raising 11


----------------------------
Note: I just did an " $ ubuntu-bug -p xserver-xorg-core", but it didn't work. 
The command line showed:
  Warning: The options -p/-P are deprecated, please do not use them.  See 
/usr/bin/ubuntu-bug --help  
  ICE default IO error handler doing an exit(), pid = 22686, errno = 11
and the web page that opened said:
  Oops!
  Sorry, something just went wrong in Launchpad.
  We’ve recorded what happened, and we’ll fix it as soon as possible. Apologies 
for the inconvenience.
  (Error ID: OOPS-1399M3077)

** Affects: xserver-xorg-video-ati (Ubuntu)
     Importance: Undecided
         Status: Confirmed

-- 
KDE doesn't start after 9.10 update. Radeon? KDM?
https://bugs.launchpad.net/bugs/465470
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is subscribed to xserver-xorg-video-ati in ubuntu.

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