USB2VGA adapters on XO-1.5 (and XO-1 with F11 images)
martin at laptop.org
Fri Jul 16 12:46:00 EDT 2010
On XO-1? Or XO-1.5?
Maybe I typo'ed the rpm name...
On Fri, Jul 16, 2010 at 12:07 PM, Reuben K. Caron <reuben at laptop.org> wrote:
> Esteban found that xorg-x11-drv-sisvga is not available
> but xorg-x11-drv-sisusb is available. Using xorg-x11-drv-sisusb worked fine.
> Begin forwarded message:
> Message: 2
> Date: Fri, 9 Jul 2010 17:18:47 -0400
> From: Martin Langhoff <martin.langhoff at gmail.com>
> Subject: Re: USB2VGA adapters on XO-1.5 (and XO-1 with F11 images)
> To: OLPC Devel <devel at lists.laptop.org>
> Cc: Sridhar Dhanapalan <sridhar at laptop.org.au>, sandra at laptop.org,
> Keith Wilbern <kwilbern at gmail.com>, rsmith at laptop.org
> <AANLkTik-oFL5gC9Roq2J97wQLysmjlJG94rTjOYN8ow7 at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
> On Thu, Jul 8, 2010 at 1:14 PM, Martin Langhoff
> <martin.langhoff at gmail.com> wrote:
> For monitors/projectors that can handle something close to 1200x900 --
> 1152x864, you can use Xinerama instead. Here is an xorg.conf that does
> exactly that:
> The Xinerama approach turned out to be a winner in terms of
> performance and !bugginess.
> Turns out that with a bit of elbow grease we can make it work on
> 1024x768 which is what most projectors support.
> - yum install xorg-x11-drv-sisvga xorg-x11-server-Xephyr
> - Grab the files from http://dev.laptop.org/~martin/usbvga/xinerama/
> olpc-configure goes to /etc/init.d/ , make it executable
> olpc-session goes to /usr/bin/ , make it executable
> xorg-xo1.5-dcon-extmon.conf goes to /etc/X11/
> - Plug the USB2VGA device
> - Reboot & Enjoy
> Limitations and notes:
> ?- Needs to be "switched on" at X startup time. olpc-configure checks
> at boot time if sisusbvga is loaded and changes the xorg.conf symlink
> if needed. My patch also fixes a longstanding old bug where the
> xorg.conf was 'set' in the first boot.
> ?- The desktop is a little bit smaller. On the XO, the desktop
> appears in the top-left corner -- on the external monitor / projector
> it fills up the screen perfectly.
> - Icons can appear slightly pixellated. I think this technique may
> expose a bug in Sugar and in some activities (ie: TurtleArt) that keep
> a copy of rendered SVGs as bitmaps.
> ?- Performance is acceptable. (We are saturating the USB 2 bandwidth
> with the amount of pixels and the bitdepth).
> - The Sugar cursor is back!
> - Video works! No Xv however, so it's not particularly fast.
> Patch to olpc-utils is attached -- I haven't tested the spec changes.
> ?martin.langhoff at gmail.com
> ?martin at laptop.org -- School Server Architect
> ?- ask interesting questions
> ?- don't get distracted with shiny stuff? - working code first
> ?- http://wiki.laptop.org/go/User:Martinlanghoff
martin at laptop.org -- School Server Architect
- ask interesting questions
- don't get distracted with shiny stuff - working code first
More information about the Devel