Arch Linux

emes

Member

Registered: 2014-01-28

Posts: 19

Thinkpad X1 gen 3 with Gnome doesn't detect external HDMI display

Hi,

I tried to connect an external HDMI display to my Thinkpad, but Gnome display settings show only the internal display. Plugging and unplugging the cable doesn't change anything, dmesg stays silent.

Here are the outputs:

~:$ dmesg | grep -ie "vga\|hdmi\|display"
[    0.283361] pci 0000:00:02.0: vgaarb: setting as boot VGA device
[    0.283361] pci 0000:00:02.0: vgaarb: VGA device added: decodes=io+mem,owns=io+mem,locks=none
[    0.283367] pci 0000:00:02.0: vgaarb: bridge control possible
[    0.283369] vgaarb: loaded
[    1.103314] fb0: EFI VGA frame buffer device
[   11.191516] fb: switching to inteldrmfb from EFI VGA
[   11.201344] [drm] Replacing VGA console driver
[   11.206869] i915 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem
[   11.365779] input: HDA Intel HDMI HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:03.0/sound/card0/input13
[   11.365844] input: HDA Intel HDMI HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:03.0/sound/card0/input14
[   11.365903] input: HDA Intel HDMI HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:03.0/sound/card0/input15
[   11.365961] input: HDA Intel HDMI HDMI/DP,pcm=9 as /devices/pci0000:00/0000:00:03.0/sound/card0/input16
[   11.366014] input: HDA Intel HDMI HDMI/DP,pcm=10 as /devices/pci0000:00/0000:00:03.0/sound/card0/input17
~:$ lspci -v | grep -i vga
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09) (prog-if 00 [VGA controller])
~:$ xrandr
Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 8192 x 8192
XWAYLAND0 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 310mm x 170mm
   2560x1440     59.96*+

Searching for reports of similar problems I found that changing the "boot display" to HDMI in BIOS could help (for whatever reason), but it actually doesn't change anything.