Xorg fails w/scfb: Cannot run in framebuffer mode. Please specify busIDs

[Pete Wright]

On 03/20/17 11:04, Bob Willcox wrote:
> I had to reboot my system this morning (power outage over the weekend forced
> it) and now X won't start, failing with these error msgs from the Xorg.log:
>
> [   143.327] (EE) open /dev/dri/card0: No such file or directory
> [   143.327] (WW) Falling back to old probe method for modesetting
> [   143.327] (EE) open /dev/dri/card0: No such file or directory
> [   143.327] (WW) Falling back to old probe method for scfb
> [   143.327] scfb trace: probe start
> [   143.327] (II) scfb(1): using default device
> [   143.327] scfb trace: probe done
> [   143.327] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support
> [   143.327] (EE) Screen 0 deleted because of no matching config section.
> [   143.327] (II) UnloadModule: "modesetting"
> [   143.327] (EE)
>
> Fatal server error:
> [   143.327] (EE) Cannot run in framebuffer mode. Please specify busIDs        for all framebuffer devices
> [   143.328] (EE)
> [   143.328] (EE)
>
> This is on an Intel NUC system with a i7-5557U (Broadwell) CPU. The uname -a
> output is:
>
> FreeBSD tavion.austin.ibm.com 10.3-STABLE FreeBSD 10.3-STABLE #3 r315638: Mon Mar 20 11:44:00 CDT 2017 root at tavion.austin.ibm.com:/usr/obj/usr/src/sys/TAVION  amd64
>
> This system has been running with the scfb frame buffer driver for a couple of
> years now with X running fine (if a bit slow).
>
> I just updated my ports 3/14 to revision 436172. Hadn't rebooted till today.
>
> I updated the system this morning hoping that would help, but no such luck as
> I still get the same failure.
>
> Note that I am loading the i915kms.ko module as instructed in the
> /usr/ports/UPDATING file (have been doing that all along) so it would seem
> that I've run into something else.
>
> Also, reading the FreeBSD wiki for SCFB I added this file in
> /usr/local/bin/etc/xorg.conf.d/driver-scfb.conf:
>
> Section "Device"
>      Identifier  "Card0"
>      Driver      "scfb"
> EndSection
>
> Without any descernable change.

On my i7 skylake system I have inserted this like in my xorg.conf:

         BusID       "PCI:0:2:0"

This has allowed me to use modesetting, intel and scfb Xorg drivers 
without issue.  I am not sure why X isn't able to autodetect the 
appropriate BusID though...

hope this helps,
-pete

-- 
Pete Wright
pete at nomadlogic.org
@nomadlogicLA