Hi Michael. > On 6 September 2016 at 11:13, Michael Thayer <michael.tha...@oracle.com> wrote: > > > > Hello Jan, > > > > I think you asked about this on IRC yesterday. The first file that you mention is part of the Linux drm driver (the rest is the other files in that folder). I wrote the driver, based on in-kernel ones, but I am not an expert in the kernel drm subsystem, and in particular I only use the basic kernel fbdev translation functions to provide the framebuffer driver. You would probably be better asking on the dri-devel list<1> about what to change to get one fbdev device per head. You might be in luck and there might be a simple solution. > > >
I just get some patches which adds to the linux vboxvideo.ko support for multiframebuffer (one framebuffer per display). But I have some very strange trouble with it. When started, only the first framebuffer is working (and so only one graphical display is enabled). Then I enable second FB by entering "fbset -ifb /dev/fb1 -accel 1". An that moment, I get the virtual machine freezed. Now if I try to send [ENTER] or any other key, I don't see cursor or any ather activities on the command line (on guest Linux system). The strangeness is that if I click on close button of guest console window (so the popup menu starts with option of save, shutdown or power-off), the windows title changed to "paused" and only now I can see the previously entered keys showed on guest console. It looks like console lock is released when popup windows started and again acquired if I cancel popup. It looks like the guest console (fbcon?) gets freezed (so locked) by some initialization task inside the modified vboxvideo driver. Configuration: Host system: Fedora 24 desktop with kernel 4.6.7, but my colleague tries that on Windows 7, the issue is the same, so I guess it is host system independetend issue Guest: I tried two distros, both have installed minimal packages and no Xwin Guest1: Fedora 24 desktop, kernel 4.6.7 Guest2: Arch latest, kernel 4.7.2 Do you have any idea how to debug such console freeze? /Jan > Yes, I was asking on irc, but I think I fallen in lunch mode there, so only silence :) > That is why I asked here again. > > Anyway, thanks for the hints! I definitely will have a try with drm. > > But it's good that the author of driver is reachable. > So more questions can come later ;) > > CU > /Jan > > > > Regards, > > > > Michael > > > > <1> https://lists.freedesktop.org/mailman/listinfo/dri-devel > > > > > > On 05.09.2016 17:42, Jan Petrouš wrote: > >> > >> Hi, > >> > >> as VirtualBox supports dual head config I was trying to start two > >> framebuffers on it. > >> But unsucessfull. > >> > >> The main constraint is that guest Linux is very tiny and has no > >> X-Windows inside. > >> The application requires only the framebuffer devices. > >> > >> I did many hours googling to find solution but I found only solution for > >> xwin environment. > >> > >> Is it even possible to enable two FB devices on dualhead configuration? > >> > >> If the answer is NO, can you show me where I should start to look inside > >> the sources? > >> > >> I found the VB Additions subversion repo where are at least two video > >> drivers: > >> > >> 1, > >> http://www.virtualbox.org/svn/vbox/trunk/src/VBox/Additions/linux/drm/vbox_fb.c > >> 2, > >> http://www.virtualbox.org/svn/vbox/trunk/src/VBox/Additions/x11/vboxvideo/vboxvideo.c > >> > >> I guess that the driver for my non-x11 environment is the first one. Is > >> it true? > >> > >> I'm rather linux video driver noob, but I would like to get some good > >> start point > >> where I can at least try to start with. > >> > >> BR. > >> /Jan > >> > >> PS: Installed Fedora Server 24 Minimal config, so kernel is 4.6.7 > >> > >> > >> _______________________________________________ > >> vbox-dev mailing list > >> vbox-dev@virtualbox.org > >> https://www.virtualbox.org/mailman/listinfo/vbox-dev > >> > > > > -- > > Michael Thayer | VirtualBox engineer > > ORACLE Deutschland B.V. & Co. KG | Werkstr. 24 | D-71384 Weinstadt > > > > ORACLE Deutschland B.V. & Co. KG > > Hauptverwaltung: Riesstraße 25, D-80992 München > > Registergericht: Amtsgericht München, HRA 95603 > > > > Komplementärin: ORACLE Deutschland Verwaltung B.V. > > Hertogswetering 163/167, 3543 AS Utrecht, Niederlande Handelsregister der Handelskammer Midden-Nederland, Nr. 30143697 > > Geschäftsführer: Alexander van der Ven, Jan Schultheiss, Val Maher
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