On Wed, 22 Aug 2018, Chris Chiu <chiu@xxxxxxxxxxxx> wrote: > On Fri, Jul 6, 2018 at 2:44 PM, 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 > > There's a patch https://bugs.freedesktop.org/show_bug.cgi?id=107125#c8. > And I verified on the X705FD/X560UD which were easy to reproduce, the patch > works as expected. Can anyone kindly give comments about this patch? > We can do anything to help fix this issue upstream. Thanks Seems like a hack. Should look into hw based debouncing or a slight delay in the hotplug work processing I think. BR, Jani. > > Chris > >> 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 -- Jani Nikula, Intel Open Source Graphics Center _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
