On Mon, Nov 23, 2015 at 05:07:29PM +0200, Ville Syrjälä wrote: > On Sat, Nov 21, 2015 at 10:44:12AM +0000, Chris Wilson wrote: > > On Fri, Nov 20, 2015 at 10:35:41PM +0200, ville.syrjala@xxxxxxxxxxxxxxx wrote: > > > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > > > > > > On some machines the CRT connector may be fused off. The weird thing > > > about this setup is that the ADPA register works otherwise normally, > > > except the enable bit is hardwired to 0. No one knows of any fuse > > > register that would tell us if this is the case, so the only thing we > > > can do (apart from a blacklist) is to try and set the enable bit and see > > > if it sticks. If not, we don't register the connector at all. Obviously > > > if the bit is already set when loading the driver we can just assume it > > > works. > > > > > > I've smoke tested this approach on several machines (GMCH and PCH), > > > some with actual CRT connectors, some with shadow connectors, and > > > obviously the machine (IVB) with the fused off connector. So far > > > I've not seen any ill effects from this probe. > > > > > > The main benefit is that we can actually run igt on machines with > > > fused off connectors, without totally upsetting the state checker. > > > > > > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > > > > If we can't enable the VGA port, there's not much we can do with it. > > > > Acked-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > > > > I'm just a bit hesistant, in case there are machine out there that > > simply do not report the hw state back (doubtful) or there are people > > who make use of the false VGA as a fake output (like me, or perhaps > > kvm-over-ip). I'll survive, I just use a fake HDMI output if there is no > > VGA. > > Based on my experience most machines that lack the physical connector > still have a fully working ADPA register. I have two such machines > myself. There's just this one machine at our office where it's > totally fused off, and running igt on it is no fun unless we get rid > of the connector. Patch merged, thanks for the ack. -- Ville Syrjälä Intel OTC _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
