<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [SKL] ext. HDMI hotplug not working on i7-6700HQ laptop" href="https://bugs.freedesktop.org/show_bug.cgi?id=98912#c8">Comment # 8</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [SKL] ext. HDMI hotplug not working on i7-6700HQ laptop" href="https://bugs.freedesktop.org/show_bug.cgi?id=98912">bug 98912</a> from <a class="email" href="mailto:imre.deak@intel.com" title="Imre Deak <imre.deak@intel.com>"> Imre Deak</a> <pre>(In reply to raptorteak from <a href="show_bug.cgi?id=98912#c7">comment #7</a>) > $ sudo i2cdump -y 4 0x40 i > 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef > 00: 44 50 2d 48 44 4d 49 20 41 44 41 50 54 4f 52 04 DP-HDMI ADAPTOR? > 10: a8 00 1c f8 50 53 31 37 35 30 b0 00 00 78 0f 00 ?.??PS1750?..x?. > 20: 00 00 08 00 00 00 00 00 00 00 00 00 00 00 00 00 ..?............. > 30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 40: 01 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ??.............. > 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > > Looks like you are right about the adapter. However, drm-tip didn't do the > trick :< . Unless there is a specific config to enable ? > > Above is a newer dmesg from the drm-tip run. Thanks, LSPCON is enabled now and the monitor is detected during bootup, but after replug the adaptor's AUX channel is down for some reason, so detection will fail. One possibility is that the adaptor switches to LS mode during unplug and we have to switch back to PCON mode. Could you get the same i2cdump as above after replugging and try the following patch: diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 9dfbde4..96809cf 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -4101,9 +4101,13 @@ intel_dp_short_pulse(struct intel_dp *intel_dp) static enum drm_connector_status intel_dp_detect_dpcd(struct intel_dp *intel_dp) { + struct intel_lspcon *lspcon = dp_to_lspcon(intel_dp); uint8_t *dpcd = intel_dp->dpcd; uint8_t type; + if (lspcon->active) + lspcon_resume(lspcon); + if (!intel_dp_get_dpcd(intel_dp)) return connector_status_disconnected;</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>