On Thu, 2017-08-10 at 19:45 +0200, Stefan Assmann wrote: > On 2017-08-10 07:50, Rodrigo Vivi wrote: > > I'm not sure if this is really the case and I don't believe > > this is the real fix for the bug mentioned here, but since > > I don't see a reliable path when mst_port is set and when > > mode_valid is requested I believe it is worth to have this > > protection here. > > Hi Rodrigo, > > I've applied the patch but problem seems to be somewhere else. After > switching display input the system is no longer reachable via ssh. > I ran dmesg -w over ssh and captured the output as far as possible. > Have a look: > https://paste.fedoraproject.org/paste/mgzW~jAzpaS4A3rmfkTZKw > > Thanks! > > Stefan > Looking at the logs, it appears you have a MST monitor connected to a MST-dock. DP-3 should have been branch device that always remains disconnected. But the log shows [ 3.812789] [drm] forcing DP-3 connector on [ 3.812809] [drm:drm_connector_init [drm]] cmdline mode for connector DP-3 0x0@60Hz And then when there is a long pulse (when you switched modes on the monitor), which should be marking all connectors as disconnected. [ 244.504884] [drm:intel_get_hpd_pins [i915]] hotplug event received, stat 0x00400000, dig 0x00101210, pins 0x00000040 This happens - [ 244.668328] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:79:DP-3] status updated from disconnected to connected Looks like this has something to do with the connector status being forced. -DK > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102022 > > Cc: Elizabeth <elizabethx.de.la.torre.mena@xxxxxxxxx> > > Cc: Stefan Assmann <sassmann@xxxxxxxxxx> > > Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx> > > Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> > > --- > > drivers/gpu/drm/i915/intel_dp_mst.c | 3 +++ > > 1 file changed, 3 insertions(+) > > > > diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c > > index 58568559711a..93fc8ab9bb31 100644 > > --- a/drivers/gpu/drm/i915/intel_dp_mst.c > > +++ b/drivers/gpu/drm/i915/intel_dp_mst.c > > @@ -370,6 +370,9 @@ intel_dp_mst_mode_valid(struct drm_connector *connector, > > int bpp = 24; /* MST uses fixed bpp */ > > int max_rate, mode_rate, max_lanes, max_link_clock; > > > > + if (!intel_dp) > > + return MODE_ERROR; > > + > > max_link_clock = intel_dp_max_link_rate(intel_dp); > > max_lanes = intel_dp_max_lane_count(intel_dp); > > > > -- > > 2.13.2 > > _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
