USB2VGA adapters on XO-1.5 (and XO-1 with F11 images)

[Martin Langhoff]

On XO-1? Or XO-1.5?

Maybe I typo'ed the rpm name...


m

On Fri, Jul 16, 2010 at 12:07 PM, Reuben K. Caron <reuben at laptop.org> wrote:
> Martin,
> Esteban found that xorg-x11-drv-sisvga is not available
> but xorg-x11-drv-sisusb is available. Using xorg-x11-drv-sisusb worked fine.
> Reuben
>
> 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
> Message-ID:
> <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.
>
> cheers,
>
>
> m
> --
> ?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
 - http://wiki.laptop.org/go/User:Martinlanghoff