[Bug 100213] [i915] [SKL] Incomplete list of HDMI connected display resolution detected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100213

--- Comment #15 from Ladislav Michl <ladis at linux-mips.org> ---
Retested with 4.16.0 and 4.16.0-next-20180409

Machine has HDMI and VGA connector:
https://www.exasoft.cz/hp-zbook-17-g3-1rq40es-bcm-cerna-image1-big_ies1790841.jpg

$ cat /sys/class/drm/card0/device/graphics/fb0/name
nouveaufb
$ cat /sys/class/drm/card1/device/graphics/fb1/name 
inteldrmfb

Plugging monitor into VGA output gives:
$ grep . /sys/class/drm/card*-*/modes
/sys/class/drm/card1-DP-3/modes:1920x1200
/sys/class/drm/card1-DP-3/modes:1600x1200
/sys/class/drm/card1-DP-3/modes:1280x1024
/sys/class/drm/card1-DP-3/modes:1280x1024
/sys/class/drm/card1-DP-3/modes:1152x864
/sys/class/drm/card1-DP-3/modes:1024x768
/sys/class/drm/card1-DP-3/modes:1024x768
/sys/class/drm/card1-DP-3/modes:800x600
/sys/class/drm/card1-DP-3/modes:800x600
/sys/class/drm/card1-DP-3/modes:640x480
/sys/class/drm/card1-DP-3/modes:640x480
/sys/class/drm/card1-DP-3/modes:720x400
/sys/class/drm/card1-eDP-1/modes:1920x1080
/sys/class/drm/card1-eDP-1/modes:1920x1080
Here everything works as expected.

Plugging the same monitor to HDMI output:
$ grep . /sys/class/drm/card*-*/modes
/sys/class/drm/card0-DP-5/modes:1920x1200
/sys/class/drm/card0-DP-5/modes:1600x1200
/sys/class/drm/card0-DP-5/modes:1280x1024
/sys/class/drm/card0-DP-5/modes:1280x1024
/sys/class/drm/card0-DP-5/modes:1152x864
/sys/class/drm/card0-DP-5/modes:1024x768
/sys/class/drm/card0-DP-5/modes:1024x768
/sys/class/drm/card0-DP-5/modes:800x600
/sys/class/drm/card0-DP-5/modes:800x600
/sys/class/drm/card0-DP-5/modes:640x480
/sys/class/drm/card0-DP-5/modes:640x480
/sys/class/drm/card0-DP-5/modes:720x400
/sys/class/drm/card1-eDP-1/modes:1920x1080
/sys/class/drm/card1-eDP-1/modes:1920x1080
Here monitor goes to sleep as there seem to be no clock. Also It seems I hit
this bug:
https://gitlab.gnome.org/GNOME/mutter/issues/21

I tried to get meaningful debug output, but no luck so far.

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