The recent xorg server does not support the old xinerama setting, precisely Option "MonitorLayout" in the Device Section. The old configuration of xorg.conf are
2007/03/05 - [computer/linux] - Xinerama on Ubuntu 6.10 with open source driver
2008/02/06 - [computer/linux] - modified xorg.conf file
I spent several days to understand this inconvenient HISTORY about xorg. Finally everthing is o.k. now.
Now, a part of the brand-new xorg.conf file is
But, The methods which are well-described in the following references are not the solutions to my laptop.
Now, the classic story is ....
1. Monitor Section
There are two monitors: one is the laptop panel, the other is an external monitor, for me Dell E177FPf. In the xorg.conf, the gray colored texts are "optional" that is not critical for my machine.
The Dell monitor spec is on http://accessories.us.dell.com/sna/products/Displays/productdetail.aspx?c=us&l=en&cs=19&sku=320-5577 and is listed in the more
GeneralDisplay TypeFlat panel display / TFT active matrixWidth14.8 inDepth5.5 inHeight15 inWeight10.1 lbsEnclosure ColorBlack DisplayDiagonal Size17"Viewable Size17"Dot Pitch / Pixel Pitch0.264 mmMax Resolution1280 x 1024 / 75 HzColor Support24-bit (16.7 million colors)Max Sync Rate (V x H)76 Hz x 81 kHzResponse Time5 msDisplay Positions AdjustmentsTiltSignal InputVGA ImageImage Brightness300 cd/m2Image Contrast Ratio800:1Image Max H-View Angle160Image Max V-View Angle160 Video InputAnalog Video SignalRGB Expansion / ConnectivityInterfaces1 x VGA - 15 pin HD D-Sub (HD-15) MiscellaneousCables Included1 x VGA cableFlat Panel Mount Interface100 x 100 mmFeaturesSecurity lock slot (cable lock sold separately) PowerForm FactorInternalVoltage RequiredAC 120/230 V ( 50/60 Hz )Power Consumption Operational40 WattPower Consumption Stand by / Sleep2 Watt Environmental StandardsEPEAT CompliantEPEAT SilverEPA Energy Star CompliantYes Environmental ParametersMin Operating Temperature41 °FMax Operating Temperature95 °FHumidity Range Operating10 - 80%
DisplaySize is calculated according to http://www.x.org/wiki/FAQVideoModes as
horizontal = resolution*dotpitch = 1280*0.264 = 337.92,
vertical = resolution*dotpitch = 1024*0.264 = 270.336,
or xdpyinfo | grep -B 2 dot
The references suggest to use "gtf" or "cvt" to get Modeline, but I could not get the correct ModeLine by this. Fortunately, I have another linux machine to use the same monitor, I looked into /var/log/X.org.0.log file, then I found the correct modeline.
other machine X.org.0.log
2. Device Section
Using lspci |grep VGA
Thus, BusID "PCI:1:0:0"
For ATI driver, outputs of the video card are
- LVDS : laptop panel
- VGA-0 : RGB output
3. Screen Section
Virtual is calculated by
Laptop panel is 1280x800, and the dell monitor 1280x1024
4. Final screenshot