HDMI display autodetect

[greg at unrelenting.technology]

December 3, 2019 8:12 PM, "Johannes Lundberg" <johalun at freebsd.org> wrote:

> On 2019-12-03 01:58, Alexandr Krivulya wrote:
> 
>> Hi!
>> When I attach external display over HDMI port on running system it is
>> not recognized (ThinkPad T470p with CURRENT,
>> drm-current-kmod,xf86-video-intel). xrandr do not reflect any chnages.
>> As workaround I need to reboot  or suspend-resume my system.
> 
> Hi
> 
> Does it behave the same with the modesetting X driver? (uninstall
> xf86-video-intel or set Driver = "modesetting" in xorg.conf's device
> section and restart X or reboot)
> 
> If so, does it behave the same with drm-devel-kmod instead of
> drm-current-kmod?
> 
> You can also see if the kernel driver registers any status status,
> reports error, etc by increase logging
> 
> sudo sysctl dev.drm.drm_debug=-1
> 
> (very verbose so you'd wanna switch this off when done)
> 
> Check with dmesg for any output when connecting/disconnecting the HDMI
> cable.

Also try switching to another virtual terminal (Ctrl-Alt-F<number>) and back.

For some reason I need to do this now..
(wlroots only refreshes monitors when seeing the udev/devd notification,
which makes me think that the notification is now delayed somehow)