On T500 thinkpad, I enabled KMS on i915, and noticed that only a single mode
shows up in xrandr output.  Without kms, all modes are supported.
Tested on 2.6.30 and 2.6.29.4-167 that ships with Fedora.

xrandr output:

With kms enabled:

Screen 0: minimum 320 x 200, current 1680 x 1050, maximum 8192 x 8192
VGA1 disconnected (normal left inverted right x axis y axis)
LVDS1 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 331mm 
x 207mm
   1680x1050      60.1*+   50.1  
DVI1 disconnected (normal left inverted right x axis y axis)
DVI2 disconnected (normal left inverted right x axis y axis)

Without kms enabled:

Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 1680 x 1680
VGA disconnected (normal left inverted right x axis y axis)
LVDS connected 1280x1024+0+0 (normal left inverted right x axis y axis) 331mm x 
207mm
   1680x1050      60.1 +   50.1  
   1400x1050      74.8     60.0  
   1280x1024      85.0     75.0     60.0* 
   1280x960       85.0     60.0  
   1152x864       75.0  
   1024x768       85.0     75.0     70.1     60.0  
   832x624        74.6  
   800x600        85.1     72.2     75.0     60.3     56.2  
   640x480        85.0     72.8     75.0     59.9  
   720x400        85.0  
   640x400        85.1  
   640x350        85.1  
HDMI-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)



hardware:

$ sudo lspci -vv -s 00:02.0
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset 
Integrated Graphics Controller (rev 07) (prog-if 00 [VGA controller])
        Subsystem: Lenovo Device 20e4
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 28
        Region 0: Memory at f4400000 (64-bit, non-prefetchable) [size=4M]
        Region 2: Memory at d0000000 (64-bit, prefetchable) [size=256M]
        Region 4: I/O ports at 1800 [size=8]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [90] MSI: Mask- 64bit- Count=1/1 Enable+
                Address: fee0100c  Data: 4189
        Capabilities: [d0] Power Management version 3
                Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Kernel driver in use: i915


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