On Fri, 6 Jul 2018 14:44:58 +0800 Chris Chiu <chiu@xxxxxxxxxxxx> wrote: > On Thu, Jul 5, 2018 at 10:40 PM, Ville Syrjälä > <ville.syrjala@xxxxxxxxxxxxxxx> wrote: > > On Thu, Jul 05, 2018 at 03:58:36PM +0800, Chris Chiu wrote: > >> Hi, > >> We have few ASUS laptops X705FD (The new WiskyLake), X560UD > >> (intel i5-8250U), X530UN (intel i7-8550U) share the same problem, > >> which is the HDMI connector status stays connected even the HDMI > >> cable has been unplugged. Look into the > >> "/sys/class/drm/card0-HDMI-A-1/status" for checking the status > >> while plug/unplug the HDMI, it shows "disconnected" before plug in > >> HDMI cable, then switch to "connected" after plugin, and still > >> stay "connected" after unplug. This would cause the audio output > >> path cannot correctly switch from HDMI to internal speaker after > >> unplugging the HDMI. > >> > >> I then try to verify with the latest kernel 4.18.0-rc3+, the bug > >> still present. The full "dmesg" log is here. > >> https://gist.github.com/mschiu77/d761d7c5cf191b7868d4d7788ae087f1 > >> > >> The HDMI cable is plugged in at ~26th second. > >> "[ 26.214371] [drm:drm_detect_monitor_audio [drm]] Monitor has > >> basic audio support" > >> then unplug the HDMI at ~73th second. > >> "[ 73.328361] [drm:drm_detect_monitor_audio [drm]] Monitor has > >> basic audio support" > >> > >> Please advise what I can do to fix this. Thanks > > > > Pull the cable out faster? > > > > I presume this is the same old case of hpd disconnecting slightly > > before ddc and we still manage to read the EDID when processing > > the hpd irq. We kinda tried to fix that with the live status > > check but that thing failed spectacularly. > > > > -- > > Ville Syrjälä > > Intel > > Thanks for the suggestion. I tried pulling the cable out faster, the > status shows correctly. I also tried branch drm-tip of > https://cgit.freedesktop.org/drm/drm-tip > but the symptom persists. > > Anything I can help here? Or any old commit/patch I can try to do some > experiments? > > Chris > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/intel-gfx I'm working on a same issue with HP KBL ThinPro laptop where both kernel 4.9.79 & 4.15.7 are failing the same way: - Unplug the HDMI cable slowly the connector status is still "connected" Debugging shows from kernel 4.9 and up to 4.18 drim/i915 behaves the same way: - When the HDMI calbe is unplugged, there is a transition time when the DDC lines are still connected and i915 can read back the EDID and honors "connected" state This problem does not happen on Windows7 & Windows 10 on the same failing platform - Windows KMD does *not* read the DDC when seeing the corresponding PCH/HPD pins indicating "disconnected" within 300ms-400ms period - This checking is done during bottom-half interrupt routines I worked patches with both 4.15.7 and 4.17.1 intercepting this Windows KMD logics; It seems these patches work for HP KBL ThinPro laptop - My patches are being tested by HP team - I was just about to post the open discussion on this topic to collect inputs from our community - Do we have to refactor the HDMI hot-plug handling codes to cope with this long standing issue? - Is that OK to add 300ms-500ms delay "msleep(100)" in a loop in the bottom half of interrupt routines? Regards, -Guang _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
