** Description changed:

  I installed ubuntu9.04 (later I tried i386,x64,kubuntu , liveCD and DVD, and 
the bug remained), with my lenovo thinkpad T400 switchable graphic card 
enabled, os detectable yes, and all work fine. Only sometimes system use 
internal GPU, sometime use ATI, cause the find hardware driver sometimes report 
ati driver not installed, sometimes no driver detected. 
  But after I installed the restrict driver for ati, or I direct download the 
latest 9.4 driver from amd and install it (yeah, I tried many times, about 
reinstall my *bnutu tens of times) and enable it and reboot, Xwindow can't 
start, screen display something( sorry my english is poor I can't exactly 
describe it , look like screen crashed) no cli, no CTRL_ALT_F1. I also tried 
safe mode auto fix X, after autofix the screen turned 3 times which I think 
xwindow restart 3 time and remain blank screen for ever. Also safe mode cli 
remove fglrx*, none of them works , have to reinstall.
  Until finally, I figured out what happened, then I go to BIOS ,disable 
switchable graphic card, disable os detectable, It works fine.
  
  BTW, I tried Mandriva 2009.1 too, do not like ubuntu , I have to enable
  os detectable to yes to make it start to install ,otherwise it just
  remain rebooting after splash screen for ever.
+ 
+ [lspci]
+ 00:00.0 Host bridge [0600]: Intel Corporation Mobile 4 Series Chipset Memory 
Controller Hub [8086:2a40] (rev 07)
+       Subsystem: Lenovo Device [17aa:20e0]
+ 00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series 
Chipset Integrated Graphics Controller [8086:2a42] (rev 07)
+       Subsystem: Lenovo Device [17aa:2113]
+ 01:00.0 VGA compatible controller [0300]: ATI Technologies Inc Mobility 
Radeon HD 3400 Series [1002:95c4]
+       Subsystem: Lenovo Device [17aa:210f]

-- 
xwindow crashed when system start after installed ATI drivers, on lenovo 
thinkpad T400 with both grahic card enabled
https://bugs.launchpad.net/bugs/372641
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