Adding USB SVGA: Difference between revisions
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Using recent Operating Systems, it is easy to make a USB2VGA adapter work with your XO. Using USB2VGA adapters has some limitations (see below for details). |
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= Selecting the right USB-SVGA adapter = |
= Selecting the right USB-SVGA adapter = |
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Short version: The devices tested and known to work are |
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This technique is supported with some USB-SVGA adapters based on the SIS USB-SVGA device, which uses the 'sisusbvga'(kernel) and 'sisusb'(xorg) drivers. |
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* [http://www.sitecom.com/product.php?productcode=CN-105&productid=292 Sitecom CN-105] |
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* [http://www.sweex.com/en/assortiment/connectivity/converters-data-linking/KB100050 Sweex KB100050] |
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* [http://www.startech.com/Product/ItemDetail.aspx?productid=USB2VGA&c=UK Startech.com USB2VGA] |
* [http://www.startech.com/Product/ItemDetail.aspx?productid=USB2VGA&c=UK Startech.com USB2VGA] |
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* [http://www.startech.com/Product/ItemDetail.aspx?productid=USB2VGA2&c=UK Startech.com USB2VGA2] |
* [http://www.startech.com/Product/ItemDetail.aspx?productid=USB2VGA2&c=UK Startech.com USB2VGA2] |
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While in general, this feature works with USB-SVGA adapters based on the SIS Net2280/SiS315 chipset, which uses the 'sisusbvga'(kernel) and 'sisusb'(xorg) drivers, '''only those two models have been reported to work'''. Other devices from Startech.com are available, with similar model names, but you should not expect them to work. |
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Using lsusb, we have seen these identifiers on devices that work: |
Using lsusb, we have seen these identifiers on devices that work: |
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Bus 004 Device 005: ID 0711:0900 Magic Control Technology Corp. SVGA Adapter |
Bus 004 Device 005: ID 0711:0900 Magic Control Technology Corp. SVGA Adapter |
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'''Important notice :''' In older OSs, unless you compiled the sisusbvga module for your kernel, the module can possibly not be fully powered on, do not think the XO is not powerful enough to handle it, just insert the module to make sure it gets powered on. |
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Just plug the USB2VGA device to the XO, and start it up (or restart it if it is on). The desktop will only appear on the external display. The LCD of the XO will not be operational. |
Just plug the USB2VGA device to the XO, and start it up (or restart it if it is on). The desktop will only appear on the external display. The LCD of the XO will not be operational. |
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* Some activities (for example Pippy) do not work or display correctly on the "smaller" screen. |
* Some activities (for example Pippy) do not work or display correctly on the "smaller" screen. |
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* There may be a visible difference in color temperature |
* There may be a visible difference in color temperature |
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* Earlier than 10.1.3 the kernel module may be missing in some OS/XO model combinations -- compile the kernel and modprobe sisusbvga. |
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= Pictures = |
= Pictures = |
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Latest revision as of 02:26, 26 October 2011
Using recent Operating Systems, it is easy to make a USB2VGA adapter work with your XO. Using USB2VGA adapters has some limitations (see below for details).
Selecting the right USB-SVGA adapter
Short version: The devices tested and known to work are
While in general, this feature works with USB-SVGA adapters based on the SIS Net2280/SiS315 chipset, which uses the 'sisusbvga'(kernel) and 'sisusb'(xorg) drivers, only those two models have been reported to work. Other devices from Startech.com are available, with similar model names, but you should not expect them to work.
For more details, see the author's page here. Some devices reported to work according to the NSLU2 wiki
Using lsusb, we have seen these identifiers on devices that work:
Bus 004 Device 005: ID 0711:0900 Magic Control Technology Corp. SVGA Adapter
On XO OS 10.1.3 and newer
Just plug the USB2VGA device to the XO, and start it up (or restart it if it is on). The desktop will only appear on the external display. The LCD of the XO will not be operational.
On XO OS 10.1.1 and 10.1.2
You will need to install some required modules from the main repositories
yum install xorg-x11-drv-sisusb
And the RPM containing the required auto-configuration scripts
wget http://dev.laptop.org/~martin/public_rpms/f11/olpc-utils-1.0.31-1.fc11.i586.rpm
rpm -Uvh olpc-utils-1.0.31-1.fc11.i586.rpm
Connect the USB SVGA adapter, and restart your XO.
On XO OS 8.2.1 and earlier
The process is more complex as you will have to compile kernel and xorg modules. See Adding_USB_SVGA/Fedora_9_and_earlier
Limitations and quirks
- No mirroring, external display only. When you are using the USB VGA device, we disable the internal LCD screen. This is for two reasons
- Performance is bad when trying to drive the 2 screen simultaneously. This is in part because the internal display is very differentrom a conventional screen.
- On XO-1, the OS releases based on Fedora 11 (the 10.1.x series) cannot run both the internal video card and a SiS USB device.
- Sometimes changes are not shown on screen immediately. Move the pointer to get the external display updated. There is a bug in the SiSUSBVGA driver that "forgets" to update the screen. We are investigating.
- When using the USB SVGA device, power saving mode is disabled so you battery will drain faster.
- Performance is slower.
- Some activities (for example Pippy) do not work or display correctly on the "smaller" screen.
- There may be a visible difference in color temperature
- Earlier than 10.1.3 the kernel module may be missing in some OS/XO model combinations -- compile the kernel and modprobe sisusbvga.
Pictures
Here are some pictures of the OLPC working with the USB-SVGA adapter.
Caption1
Caption2
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Caption4
Caption5
Caption6
Caption7
Other Resources
- See Remote display for other ways to connect a second display to an XO.
- For alternate linux distributions, see this thread
- Experimental: DisplayLink