On Thu, Dec 17, 2009 at 6:12 AM, prudhvi raj <[email protected]> wrote: > Thank you very much for your valuable inputs Mr Alex and Adam. > > I am still a bit confused about where exactly this dual-head implementation > exists and how to make it up using tinyx server. > > As per your replies i understand that in order to make dual-head working > using an Xserver it should have one of the below features > - XRandR extension with dual-head support or > - graphics driver associated with the X server (fbdev incase of Xfbdev > server) should implement the logic of mapping the framebuffer on to two > monitors. As fbdev being a generic driver written for linux framebuffer > device it does not have dual head implemented as all cards may not have > hardware configuration required to support dual-head. > > Am i right?? > > Actually my objective is to run a tinyx server (preferably Xfbdev as it > succesfully runs on my target) on an e-book target and enable dual-head > display on it. > > So In order to acheive this should i alter the fbdev driver (in Xfbdev) to > map it on to two different displays?? Or a is this the job of RnadR/XINERAMA > extensions?? > > Or Tinyx does not support dual-head at all?? I mean Kdrive itself does not > support dual-head?? > > i am mentioning some of the observations i made during my attmpts: > > I am using the latest Xfbdev from X11R7.5 release and its having Xrandr > version 1.3. I think this is same as the Xrandr running on fedora 11. Does > this Xrandr 1.3 has dual-head support?? But usinf this also giving the same > ouput as >> Screen 0: minimum 1024 x 768, current 1024 x 768, maximum 1024 x 768 >> default connected 1024x768+0+0 (normal left inverted right x axis y >> axis) 0mm x 0mm >> 1024x768 0.0* > > But on fedora Xrandr -q clearly giving the output mentioning the VGA1, VGA2 > ouptupts and their current configuration. > > I have tried to run Xnvidia server present in KDrive (X11R7.4 release) and > the Xrandr version present in it is 1.2. The graphics card is Nvidia Quadro > fx 1700. In this case also the server is showing display on one monitor > only. I guess its because the driver implemented in Xnvidia is out of date > and it could not properly configure some advanced graphics card like nvidia > Quadro fx 1700. is it so?? > > your inputs are highly valuable as not much information is available on net > regarding dual-head support in tinyX.
There's nothing about tinyx that would prevent some sort of multi-head setup. However, you are going to need a driver that supports multiple heads to begin with. The kernel fbdev interface currently assumes 1 head per card. You'd need to fix that up first if you want to support multi-head with fbdev. Randr and xinerama won't help you unless the underlying driver supports multi-head. So you'd either have to fix fbdev (both in the kernel and on the X side) or write a native tinyx driver for you hardware that supports multi-head. If you did write a native driver, you wouldn't even have to use randr or xinerama. You could just allocate a framebuffer large enough for two heads and program the display controllers for a multi-head setup and then expose it as a single big "screen" to X. Your best bet is to use Xorg plus the native driver for your hardware. Alex > > > On Wed, Dec 16, 2009 at 8:35 PM, Alex Deucher <[email protected]> wrote: >> >> On Wed, Dec 16, 2009 at 8:44 AM, prudhvi raj <[email protected]> >> wrote: >> > I want to enable dual-head display using the KDrive tinyx server - >> > Xfbdev >> > (X11R7.5 version). I am using Nvidia graphics card with two outputs >> > connected to two samsung monitors. >> > >> > When i boot up the system with Fedora 11, the server is auto detecting >> > both >> > monitors and both the monitors are getting up and the screen is spanned >> > among the two monitors. >> > >> > But When i run the Xfbdev server the display is coming on only one >> > monitor. >> > >> > xrandr -q is giving the below output >> > Screen 0: minimum 1024 x 768, current 1024 x 768, maximum 1024 x 768 >> > default connected 1024x768+0+0 (normal left inverted right x axis y >> > axis) >> > 0mm x 0mm >> > 1024x768 0.0* >> > >> > Why is Xrandr unable to detect the second monitor?? >> > >> > The Xfbdev has been compiled with XINERAMA and XRANDR extensions. >> > >> > Should i need to configure Xfbdev in order to detect the dual head >> > configuration and show the display spanned among them?? >> >> fbdev doesn't support dualhead. You'll need to use a native driver >> for your GPU. >> >> Alex > > _______________________________________________ xorg-devel mailing list [email protected] http://lists.x.org/mailman/listinfo/xorg-devel
