** Description changed:

  I run Ubuntu on a first-generation Macbook Pro (dual-core x86; Mobility 
Radeon X1600), using the 'radeon' video driver, wdm as my X display manager and 
Blackbox as my window manager. Under Intrepid everything worked fine, however 
upgrading to Jaunty resulted in the following symptoms:
   - after logging in the X-server process begins to persistently use about 60% 
of CPU power, even with the system being completely idle;
   - opening X applications takes more and more time: for example, launching 
the xterm originally takes only a split second as before but trying to do that 
again a few minutes later implies having to wait for OVER ONE MINUTE from 
selecting the option from the menu till the moment the window actually appears. 
The slowdown affects only X applications, whatever I may run e.g. inside an 
already-active xterm runs just fine;
   - X seems to crash once in a while - all of a sudden I find myself looking 
at the wdm prompt again. The word 'seem' has been used because oddly enough I 
cannot find any trace of such crashes in X logs.
  
  The problem is quite clearly related to either the X server or its
  drivers, as forcibly downgrading xserver-xorg to the Intrepid version
  (uninstall, switch apt sources back to intrepid, reinstall) makes these
  problems go away despite the fact libX11 from Jaunty is not entirely
  compatible with the X server from Intrepid.
  
  Please let me know if you need any more information.
  
  -- 
  MS
+ 
+ [lspci]
+ 00:00.0 Host bridge [0600]: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML 
and 945GT Express Memory Controller Hub [8086:27a0] (rev 03)
+       Subsystem: Intel Corporation Device [8086:7270]
+ 01:00.0 VGA compatible controller [0300]: ATI Technologies Inc M56P [Radeon 
Mobility X1600] [1002:71c5]
+       Subsystem: Apple Computer Inc. Device [106b:0080]

-- 
[X1600] jaunty: X session (radeon) slows down, crashes
https://bugs.launchpad.net/bugs/373434
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