Public bug reported:

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 go to BIOS ,disable switchable graphic card, disable os 
detectable, It works fine.

** Affects: ubuntu
     Importance: Undecided
         Status: New

** 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 detecable 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 *butu tens of times) and enable it and reboot, Xwindow can't 
start, screen diaplay something, no cli, no CTRL_ALT_F1. I also tried safe mode 
auto fix X, and safe mode cli remove fglrx*, none of them works , have to 
reinstall.
- Util finally, I go to BIOS ,diasble switchable graphic card, disable os 
detecable, It works fine.
+ 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 go to BIOS ,disable switchable graphic card, disable os 
detectable, It works fine.

-- 
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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