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Karmic amd64, Lenovo T400, intel 4500MHD video (i915)

lspci for display:
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)                                            
00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)

I also experienced this bug recently, but am working fine again after a
reinstall.  It was strange, however, as I reverted the kernel, xserver,
and x video drivers (I was on xorg-edgers) and disabled KMS (and enabled
KMS), but was unable to alleviate myself of this problem.  It seemed to
go away on kernel 2.6.31-14 without KMS, but X was still strange
(wouldn't come up on boot).

My system was upgrade from jaunty to the Karmic alphas, then to karmic
final and after two weeks or so (with inconsistent updating/rebooting--
hard to say when/where the problem emerged) I had this problem.  I'm
still generally puzzled by the problem, but wonder mnemoc if you had an
xorg.conf file from upgrading and what it had in it.  I had used one to
force various driver options/fixes--maybe you have the same and removing
it would fix it?  Here's what I had:

Section "Device"
        Identifier      "intel"                  
        Driver          "intel"                  
        Option          "HWCursor" "on"          
        Option          "AccelMethod" "UXA"      
        Option          "ForceEnablePipeA" "true"
EndSection

Section "ServerFlags"
        Option  "DontZap"       "False"
EndSection

Section "Monitor"
    Identifier      "LVDS1"
    Option       "PreferredMode" "1440x900"
EndSection

Section "Monitor"
    Identifier      "DVI1"
    Option       "PreferredMode" "1440x900"
    Option       "IgnoreEDID"
    Modeline "1440x900" 106.5000 1440 1520 1672 1904 900 903 909 934 +HSync -VSync
EndSection

I hope this is helpful to someone

-- 
blank LVDS when using KMS
https://bugs.launchpad.net/bugs/474421
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