[Libdlo] Tips for setting up displaylink with Xinerama

[Mulchman]

Something else I forgot to mention - there was a xorg patch I had to
apply to Roberto's "xf86 X server driver thing." I'm not sure where I
got it from so I'll just post it here in case someone else needs it.

--- orig/src/displaylink.c    2009-06-10 16:38:15.000000000 +0200
+++ new/src/displaylink.c    2009-12-23 20:06:18.000000000 +0100
@@ -46,8 +46,10 @@
 
 #include "fb.h"
 
+#if GET_ABI_MAJOR(ABI_VIDEODRV_VERSION) < 6
 #include "xf86Resources.h"
 #include "xf86RAC.h"
+#endif
 
 #include "fbdevhw.h"
 
@@ -282,9 +284,11 @@
 
     fPtr->pEnt = xf86GetEntityInfo(pScrn->entityList[0]);
 
+#if GET_ABI_MAJOR(ABI_VIDEODRV_VERSION) < 6
     pScrn->racMemFlags = RAC_FB | RAC_COLORMAP | RAC_CURSOR | RAC_VIEWPORT;
     /* XXX Is this right?  Can probably remove RAC_FB */
     pScrn->racIoFlags = RAC_FB | RAC_COLORMAP | RAC_CURSOR | RAC_VIEWPORT;
+#endif
 
     /* open device */
     if
(!fbdevHWInit(pScrn,NULL,xf86FindOptionValue(fPtr->pEnt->device->options,"fbdev")))

On 2/8/2010 13:27, Mulchman wrote:
> Hi list,
>
> I was able to use this post to get a Fedora 12 (32 bit) virtual machine
> up and running with the display stretched across the vm's monitor and
> the monitor attached to my Sewell USB External Video Card DisplayLink
> device. Unfortunately, because it was inside a virtual machine, one
> can't actually move the mouse to the display link screen because the
> host operating system - and the virtual machine tools (in this case
> VMware Workstation 7) - doesn't know there's a screen there. Perhaps
> without the tools installed it would work but I didn't try. This was
> more of a proof of concept thing before attempting on another machine.
>
> I wanted to comment on a couple of items, though (I've snipped out some
> of the xorg.conf settings just to try and condense the email length):
>
> On 1/4/2010 08:35, B. Douglas Hilton wrote:
>   
>> To compile this, you will need to enable "Virtual Framebuffer" in your
>> kernel, and you will also want "VESA Framebuffer". Configuring vesafb
>> is beyond the scope here, but you want it to load up at boot time by
>> passing it a vga=0xNNN command appropriate for your primary display,
>> and be sure to select a 16-bit color depth.
>>   
>>     
> These options already seem to be compiled into the Fedora 12 kernel (or
> at least what I thought were the two options were already marked with
> asterisks or "M"'s when inside "make menuconfig" so I didn't have to
> recompile the kernel. The vga=0xNNN was important, too, and supplying an
> invalid value at boot gave me a list of available values. I picked
> something like 1024x768 with 16 bit depth and stuck with it.
>   
>> Section "ServerLayout"
>>         Screen      0  "RadeonScreen" 0 0
>>         Screen      1  "DisplayLinkScreen" LeftOf "RadeonScreen"
>>         Option         "Xinerama" "true"
>> EndSection
>>   
>>     
> I used similar settings - screen names were changed, of course...
>   
>> Section "Device"
>>         Driver      "fbdev"
>> 	Option      "fbdev" "/dev/fb0"
>>         BusID       "PCI:1:0:0"
>> EndSection
>>   
>>     
> I used similar settings here. The key "a-ha" part here was adding the
> BusID line to my xorg.conf. Fedora 12 doesn't ship w/ any xorg.conf so I
> had to make my own and without the BusID line only the vm's monitor
> would work and the DisplayLink monitor would stay green. This had me
> puzzled for a while.
>   
>> Section "Device"
>>         Identifier  "DisplayLinkDevice"
>>         Driver      "displaylink"
>>         Option      "fbdev" "/dev/fb1"
>> EndSection
>>   
>>     
> And again I used similar settings here (basically a copy/paste from my
> mulchman.org blog).
>
> After getting the vm up and running in VMware Workstation 7 I then tried
> to replicate things on a laptop but have run into some other problems
> that I haven't worked out yet. It seems like the fbdev driver wants to
> run @ 1280x800 but I can't find a vga=0xNNN # that works for the laptop
> and is also 1280x800.
>
> In short, thanks for the writeup B. Douglas Hilton as it provided a good
> base to venture out from. I just need to spend more time on the laptop
> and maybe I'll get it working.
>
> -Pat O'Leary
>