On Mon, 9 Sep 2019 at 08:52, Deucher, Alexander <Alexander.Deucher@xxxxxxx> wrote: > > > -----Original Message----- > > From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of > > Dave Airlie > > Sent: Sunday, September 1, 2019 11:09 PM > > To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx > > Subject: [PATCH] radeon: add option so DVI always respect HPD over DDC > > > > From: Dave Airlie <airlied@xxxxxxxxxx> > > > > Purelink FX-D120 (DVI over fibre extendeders) drive the HPD line low on the > > GPU side when the monitor side device is unplugged or loses the connection. > > However the GPU side device seems to cache EDID in this case. Per DVI spec > > the HPD line must be driven in order for EDID to be done, but we've met > > enough broken devices (mainly > > VGA->DVI convertors) that do the wrong thing with HPD that we ignore > > it if a DDC probe succeeds. > > > > This patch adds an option to the radeon driver to always respect HPD on DVI > > connectors such that if the HPD line isn't driven then EDID isn't probed. > > Probably cleaner to make this a connector property rather than a global enable, but I'm not too pressed either way. Just wanted a way to let them set it on the command line, rather than run a script at bootup, but maybe it's cleaner, will look into it a bit more. Dave. _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
