安装ddccontrol的时候，会同时安装一个ddccontrol-db，从而借助/usr/share/ddccontrol-db/monitor/文件夹中的显示器数据库来探测显示器参数，它探测出我的显示器是HPC1998，可惜数据库中缺少HPC1998的资料而没有探测成功。下面的参数p是指通过I2C设备来探测。
# ddccontrol -pv
ddccontrol version 0.4.2
Copyright 2004-2005 Oleg I. Vdovikin (oleg@cs.msu.su)
Copyright 2004-2006 Nicolas Boichat (nicolas@boichat.ch)
This program comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of this program under the terms of the GNU General Public License.
ddcpci initing...
Starting /usr/bin/ddcpci 1 1883418815 &...
Probing for available monitors...
Found PCI device (pci:00:0d.0-0)
Found PCI device (pci:00:0d.0-1)
Found PCI device (pci:00:0d.0-2)
Device: pci:00:0d.0-0
Error while reading write message answer: Bad message
Reading EDID 0x50 failed.
ddcci_open returned -2
Device: pci:00:0d.0-1
Error while reading write message answer: Bad message
Error while reading write message answer: Bad message
Error while reading write message answer: Bad message
I/O warning : failed to load external entity "/usr/share/ddccontrol-db/monitor/HPC1998.xml"
Document not parsed successfully.
Control brightness has been discarded by the caps string.
Control contrast has been discarded by the caps string.
Control red has been discarded by the caps string.
Control green has been discarded by the caps string.
Control blue has been discarded by the caps string.
Control redblack has been discarded by the caps string.
Control greenblack has been discarded by the caps string.
Control blueblack has been discarded by the caps string.
Control colortemp has been discarded by the caps string.
Control hpos has been discarded by the caps string.
Control vpos has been discarded by the caps string.
Control hsize has been discarded by the caps string.
Control vsize has been discarded by the caps string.
Control auto has been discarded by the caps string.
Control hpincushion has been discarded by the caps string.
Control hpincushionbalance has been discarded by the caps string.
Control vlinearity has been discarded by the caps string.
Control vlinearitybalance has been discarded by the caps string.
Control hmisconvergence has been discarded by the caps string.
Control vmisconvergence has been discarded by the caps string.
Control keybalance has been discarded by the caps string.
Control key has been discarded by the caps string.
Control tdistortionctrl has been discarded by the caps string.
Control tdistortionbalance has been discarded by the caps string.
Control bdistortionctrl has been discarded by the caps string.
Control bdistortionbalance has been discarded by the caps string.
Control tilt has been discarded by the caps string.
Control hmoire has been discarded by the caps string.
Control vmoire has been discarded by the caps string.
Control focus has been discarded by the caps string.
Control coarse has been discarded by the caps string.
Control fine has been discarded by the caps string.
Control defaults has been discarded by the caps string.
Control defaultluma has been discarded by the caps string.
Control defaultgeom has been discarded by the caps string.
Control defaultcolor has been discarded by the caps string.
Control settings has been discarded by the caps string.
Control audiospeakervolume has been discarded by the caps string.
Control degauss has been discarded by the caps string.
Control osdorientation has been discarded by the caps string.
Control inputsource has been discarded by the caps string.
Control dpms has been discarded by the caps string.
Control power has been discarded by the caps string.
Error while reading write message answer: Bad message
ddcci_open returned -1
Device: pci:00:0d.0-2
Error while reading write message answer: Bad message
Reading EDID 0x50 failed.
ddcci_open returned -2
Detected monitors :
- Device: pci:00:0d.0-1
DDC/CI supported: No
Monitor Name: VESA standard monitor
Input type: Analog
No monitor supporting DDC/CI available.
If your graphics card need it, please check all the required kernel modules are loaded (i2c-dev, and your framebuffer driver).
ddcpci being released...
==>ddcpci is quitting.
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