[Intel-gfx] [PATCH RESEND 2/2] drm/i915: prevent the vgacon from ever reloading

[Emil Velikov]

On 27 November 2015 at 15:10, Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
> It only leads to bloodshed and tears - we don't bother to restore a
> working legacy vga hw setup.
>
> On haswell with the new dynamic power well code this leads to even
> more hilarity since for some configurations the hardware is simply no
> longer there.
>
> The actual implementation is a bit a hack - we realy on fbcon to kick
> out the vgacon. To make this also work with I915_FBDEV=n (or FBCON=n)
> and VGA_CONSOLE=y i915 already unregisters the vga console manually
> early in the driver load sequence.
>
Interesting... nv50 and later GPUs are in a roughly similar shame
afaict. They lack the dedicated hardware and no one really bothered
figuring out how to restore things to a working shape [1].

Then again, upon sequential load of the nouveau module the GPU gets
initialised properly, where you can get X (weston?) up and running
without issues. Am I thinking about a different thing ?

I take it that you guys do less of the (re)initialisation dance, to
ensure faster boot times ?

Thanks,
Emil

[1] http://nouveau.freedesktop.org/wiki/KernelModeSetting/#deactivatingkmsandunloadingnouveau