Red Hat Bugzilla – Bug 1019543
radeonsi: Monitors on HDMI not recognized with xrandr on Radeon HD 7700 (Cape Verde)
Last modified: 2014-08-20 23:50:38 EDT
With my Radeon HD 7770 and the open radeonsi driver (on Kernel 3.11.x), I am unable to output to an HDTV using HDMI. Only DVI works.
GNOME's display settings never "sees" the additional screen, and xrandr always thinks that the HDMI port is disconnected, like so:
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 598mm x 336mm
1024x768 70.1 60.0
800x600 60.3 56.2
640x480 66.7 60.0
Created attachment 812727 [details]
Created attachment 812728 [details]
Created attachment 812729 [details]
Issue persists in F20.
Interestingly enough, this is not an issue if the HDMI cable was plugged in at poweron/boot time instead of hotplugged: when cold-plugged, both screens are turned on.
Turns out it was a physical PEBKAC with the connector.