<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO --- - [BYT]udevadm unable to monitor HDMI plug/unplug event sporadically" href="https://bugs.freedesktop.org/show_bug.cgi?id=82593#c2">Comment # 2</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO --- - [BYT]udevadm unable to monitor HDMI plug/unplug event sporadically" href="https://bugs.freedesktop.org/show_bug.cgi?id=82593">bug 82593</a> from <a class="email" href="mailto:jinxianx.guo@intel.com" title="Guo Jinxian <jinxianx.guo@intel.com>"> Guo Jinxian</a> <pre>Created <a href="attachment.cgi?id=106403" name="attach_106403" title="dmesg">attachment 106403</a> <a href="attachment.cgi?id=106403&action=edit" title="dmesg">[details]</a> dmesg (In reply to <a href="show_bug.cgi?id=82593#c1">comment #1</a>) > Please enable drm.debug=0xf to get drm core debugging, *or* apply this patch > to debug the hotplug events: > > diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c > index ab1a5f6dde8a..6abf092d9eb4 100644 > --- a/drivers/gpu/drm/drm_sysfs.c > +++ b/drivers/gpu/drm/drm_sysfs.c > @@ -481,7 +481,7 @@ void drm_sysfs_hotplug_event(struct drm_device *dev) > char *event_string = "HOTPLUG=1"; > char *envp[] = { event_string, NULL }; > > - DRM_DEBUG("generating hotplug event\n"); > + DRM_DEBUG_KMS("generating hotplug event\n"); > > kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp); > } > > Now, doing hotplug and looking at both udevadm monitor and dmesg, do you see > cases where: > > a) there's the "generating hotplug event" in dmesg, but you do *not* get it > in udevadm monitor > > *or* > > b) you do hotplug but the message is not in dmesg and you don't get it in > udevadm either. Enable drm.debug=0xf, then doing hotplug, the result is case a):the hotplug event is able to catch by dmesg, and not catch by udevadm monitor. Dmesg info [ 216.014284] [drm:intel_hpd_irq_handler] hotplug event received, stat 0x00040000, dig 0x00000000 [ 216.014307] [drm:intel_hpd_irq_handler] digital hpd port B - short [ 216.014389] [drm:intel_dp_hpd_pulse] got hpd irq on port B - short [ 233.419105] [drm:intel_hpd_irq_handler] hotplug event received, stat 0x00040000, dig 0x00000000 [ 233.419130] [drm:intel_hpd_irq_handler] digital hpd port B - short [ 233.419172] [drm:intel_dp_hpd_pulse] got hpd irq on port B - short</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>