Ubuntu
xserver-xorg-video-intel package

  1. Bug #1639640
  2. Comment #3

Comment 3 for bug 1639640

Revision history for this message
Dan Kegel (dank) wrote : Re: black screen at boot until pressing power-off button?

I booted with drm.debug=14 and looked at the output of dmesg. It had lines like
[ 0.717202] [drm:i915_dump_device_info] i915 device info: gen=7, pciid=0x0412 rev=0x06 flags=need_gfx_hws,is_haswell,has_fbc,has_hotplug,has_llc,has_ddi,has_fpga_dbg,
...
[ 0.938640] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:36:VGA-1] disconnected
[ 0.938641] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:39:HDMI-A-1]
[ 0.938642] [drm:intel_hdmi_detect] [CONNECTOR:39:HDMI-A-1]

which made me realize: the drm driver cares a lot about which video connector you plug
into. On a whim, I replaced the DVI video cable with a VGA one... and the problem went away!

So, that's a better workaround for me: just use a vga cable.