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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