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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= Adding an USB-SVGA adapter = |
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= Selecting the right USB-SVGA adapter = |
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It is possible to make use of the USB connectors on the XO to plug in an USB-SVGA adapter. Note that Linux supports these kind of chips with the '''sisusbvga''' driver for the kernel side and '''sisusb''' module for the Xorg side. |
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Short version: The devices tested and known to work are |
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== Compiling the kernel module == |
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* [http://www.startech.com/Product/ItemDetail.aspx?productid=USB2VGA&c=UK Startech.com USB2VGA] |
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You will need to follow the instructions about rebuilding your kernel at [[Rebuilding_OLPC_kernel]] |
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* [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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Modify the olpc_defconfig to include the SiS USB-SVGA driver : |
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For more details, see [http://www.winischhofer.eu/linuxsisusbvga.shtml the author's page here]. Some devices reported to work [http://www.nslu2-linux.org/wiki/HowTo/AddVGAAdapter according to the NSLU2 wiki] |
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<pre> |
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diff --git a/arch/i386/configs/olpc_defconfig b/arch/i386/configs/olpc_defconfig |
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index 8439431..74abf3b 100644 |
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--- a/arch/i386/configs/olpc_defconfig |
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+++ b/arch/i386/configs/olpc_defconfig |
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@@ -215,7 +215,6 @@ CONFIG_NR_QUICK=1 |
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# CONFIG_MATH_EMULATION is not set |
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# CONFIG_MTRR is not set |
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# CONFIG_SECCOMP is not set |
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-# CONFIG_VGA_NOPROBE is not set |
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CONFIG_HZ_100=y |
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# CONFIG_HZ_250 is not set |
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# CONFIG_HZ_300 is not set |
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@@ -1711,7 +1710,8 @@ CONFIG_USB_SERIAL_PL2303=m |
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# CONFIG_USB_IDMOUSE is not set |
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# CONFIG_USB_FTDI_ELAN is not set |
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# CONFIG_USB_APPLEDISPLAY is not set |
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-# CONFIG_USB_SISUSBVGA is not set |
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+CONFIG_USB_SISUSBVGA=m |
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+CONFIG_USB_SISUSBVGA_CON=y |
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# CONFIG_USB_LD is not set |
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# CONFIG_USB_TRANCEVIBRATOR is not set |
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# CONFIG_USB_IOWARRIOR is not set |
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</pre> |
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Using lsusb, we have seen these identifiers on devices that work: |
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Note that we actually chose to have support for the console on the driver, which is not mandatory but can be convenient when testing. |
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Bus 004 Device 005: ID 0711:0900 Magic Control Technology Corp. SVGA Adapter |
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Now recompile your kernel using this olpc_defconfig. The newly generated kernel RPM package will include this driver. |
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= On XO OS 10.1.3 and newer = |
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== Including the driver in the OLPC development image == |
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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. |
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Now that you compiled the kernel it would be good to have it included into a testing image. Assuming that you use pilgrim, apply the following patch to get the xorg module installed as well as the kernel module not being removed by the installer script : |
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= On XO OS 10.1.1 and 10.1.2= |
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<pre> |
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diff --git a/streams.d/olpc-development.stream b/streams.d/olpc-development.stream |
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index 58fdd0b..5a8c608 100755 |
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--- a/streams.d/olpc-development.stream |
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+++ b/streams.d/olpc-development.stream |
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@@ -70,6 +70,7 @@ xorg-x11-drv-evdev |
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xorg-x11-drv-keyboard |
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xorg-x11-drv-mouse |
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xorg-x11-drv-cirrus |
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+xorg-x11-drv-sisusb |
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xorg-x11-utils |
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xorg-x11-xinit |
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xorg-x11-xauth |
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@@ -535,7 +536,7 @@ EOF |
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mkdir -p $INSTALL_ROOT/etc/sysconfig/modules |
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cat <<EOF > $INSTALL_ROOT/etc/sysconfig/modules/olpc-1.modules |
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#!/bin/sh |
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-module_list="i8042 i2c-dev sdhci dcon_bl gxfb_dcon psmouse ovcamchip cafe_ccic cafe-nand battery-class olpc-battery mousedev evdev atkbd leds-olpc" |
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+module_list="i8042 i2c-dev sdhci dcon_bl gxfb_dcon psmouse ovcamchip cafe_ccic cafe-nand battery-class olpc-battery mousedev evdev atkbd leds-olpc sisusb" |
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for i in \$module_list ; do |
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modprobe \$i >/dev/null 2>&1 |
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done |
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@@ -1315,6 +1316,10 @@ EOF |
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lib/modules/*/kernel/net/ieee80211/ieee80211*.ko \ |
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lib/firmware/*.bin | \ |
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cpio -O boot/olpcrd -o -A -c |
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+ # add the sisusb driver |
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+ echo " - Adding sisusb SVGA adapter driver" |
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+ ls lib/modules/*/kernel/drivers/usb/misc/sisusbvga/sisusbvga.ko | \ |
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+ cpio -O boot/olpcrd -o -A -c |
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case $VARIANT in |
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ext3|devel_ext3) |
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# the piix ide drivers are only needed for emulation |
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</pre> |
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You will need to install some required modules from the main repositories |
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yum install xorg-x11-drv-sisusb |
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== Compiling the xorg module == |
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And the RPM containing the required auto-configuration scripts |
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The package '''xorg-x11-drv-sisusb''' is outdated and therefore will cause ABI mismatch between this particular module and the Xorg server. As I could not recompile this module, I used an Ubuntu package to get the '''sisusb_drv.so''' file. |
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wget http://dev.laptop.org/~martin/public_rpms/f11/olpc-utils-1.0.31-1.fc11.i586.rpm |
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<pre> |
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mkdir -p extract/ |
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wget http://fr.archive.ubuntu.com/ubuntu/pool/main/x/xserver-xorg-video-sisusb/xserver-xorg-video-sisusb_0.8.1-9_i386.deb |
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dpkg -x xserver-xorg-video-sisusb_0.8.1-9_i386.deb extract/ |
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scp extract/usr/lib/xorg/modules/drivers/sisusb_drv.so olpc@laptop:/usr/lib/xorg/modules/drivers/ |
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</pre> |
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rpm -Uvh olpc-utils-1.0.31-1.fc11.i586.rpm |
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Now that the module is copied to the laptop, we can start with the Xorg configuration file. |
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Connect the USB SVGA adapter, and restart your XO. |
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== Configuring the Xorg == |
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= On XO OS 8.2.1 and earlier = |
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Add a monitor section for your projector : |
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The process is more complex as you will have to compile kernel and xorg modules. See [[Adding_USB_SVGA/Fedora_9_and_earlier]] |
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<pre> |
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Section "Monitor" |
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Identifier "Monitor1" |
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ModelName "Monitor Model" |
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Option "DPMS" |
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EndSection |
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</pre> |
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= Limitations and quirks = |
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and a device section for the SiS USB-SVGA device : |
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* '''No mirroring, external display only'''. When you are using the USB VGA device, we disable the internal LCD screen. This is for two reasons |
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<pre> |
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** 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. |
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Section "Device" |
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** 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. |
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Identifier "Card1" |
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* '''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. |
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Driver "sisusb" |
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* When using the USB SVGA device, power saving mode is ''disabled'' so you battery will drain faster. |
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EndSection |
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* Performance is slower. |
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</pre> |
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* 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 |
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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 = |
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Kill your existing Xorg server and restart it with '''olpc-dm''' |
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Here are some pictures of the OLPC working with the USB-SVGA adapter. |
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<gallery> |
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Image:Dsc01038.jpg|thumb|Caption1 |
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Image:Dsc01039.jpg|thumb|Caption2 |
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Image:Dsc01040.jpg|thumb|Caption3 |
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Image:Dsc01041.jpg|thumb|Caption4 |
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Image:Image477.jpg|thumb|Caption5 |
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Image:Image473.jpg|thumb|Caption6 |
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Image:Image475.jpg|thumb|Caption7 |
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</gallery> |
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== Other Resources == |
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* See [[Remote display]] for other ways to connect a second display to an XO. |
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* For alternate linux distributions, see this [http://www.olpcnews.com/forum/index.php?topic=1066.msg30956#msg30956 thread] |
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* Experimental: [[DisplayLink]] |
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[[category:hardware]] |
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[[category:presentations]] |
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[[category:peripherals]] |
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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
Caption3
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