On Fri, 27 Jan 2017 11:00:38 +0100 Gerd Hoffmann <kraxel@xxxxxxxxxx> wrote: > Hi folks, > > Problem at hand: A virtual machine, equipped with two display devices, > one virtual, one physical (using pci pass-through, or kvmgt-based vgpu). > > There is no easy way for the user to configure which of the two display > devices fbcon should run on. i915 happens to win over bochs-drm or qxl, > so you can't use the emulated gfx device as text console. > > One way out would be to add a module option to each driver, to turn off > fbdev emulation. Attached patch does that for i915. > > Comments? Better ideas? The vgaarb code has a concept of a vga_default_device(), it's rather PCI-centric, but maybe better than nothing. This is typically the first VGA class code device found with I/O and MMIO enabled. If fbcon defaulted to running on the vga_default_device(), a user could select which to use by re-ordering the VM hardware. The problem isn't absent on bare metal, though re-ordering hardware isn't always as simple, or necessarily possible. The problem might run deeper there too dealing with vesafb and simplefb, as well as the more device specific drivers. Rerouting legacy resources isn't always an option, but some sort of primary selection for non-encumbered devices would be useful. Thanks, Alex _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
