I'm also experiencing the same problem on a Gigabyte Brix J1900 unit
(similar to Intel Nuc). When I plug in a monitor before turning the unit
on, console shows a login on the display. If I plug a monitor after
boot, it shows no input signal.
Same kernel/ubuntu version.
Here is output from lspci -v:
00:02.0 VGA compatible controller: Intel Corporation Atom Processor
Z36xxx/Z37xxx Series Graphics & Display (rev 0e) (prog-if 00 [VGA controller])
DeviceName: Onboard IGD
Subsystem: Gigabyte Technology Co., Ltd Atom Processor Z36xxx/Z37xxx
Series Graphics & Display
Flags: bus master, fast devsel, latency 0, IRQ 11
Memory at d0000000 (32-bit, non-prefetchable) [size=4M]
Memory at c0000000 (32-bit, prefetchable) [size=256M]
I/O ports at f080 [size=8]
Expansion ROM at <unassigned> [disabled]
Capabilities: [d0] Power Management version 2
Capabilities: [90] MSI: Enable- Count=1/1 Maskable- 64bit-
Capabilities: [b0] Vendor Specific Information: Len=07 <?>
Kernel modules: i915
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1616894
Title:
[BYT] display hotplug doesn't work on console
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Xenial:
Fix Released
Bug description:
Baytrail (server) machines can't be booted up without a display
connected, because hotplug doesn't work (X kinda works around it).
This has been fixed upstream in v4.8-rc1, four commits need to be
backported:
4570d833390b100 drm/i915/vlv: Make intel_crt_reset() per-encoder
4c732e6ee9e7190 drm/i915/vlv: Reset the ADPA in vlv_display_power_well_init()
21842ea84f161ae drm/i915/vlv: Disable HPD in valleyview_crt_detect_hotplug()
84c8e0963da434d drm/i915: Enable polling when we don't have hpd
Test case:
1.
- boot without a display attached
- switch to vt1
- attach the display
- hit a key, the display should wake up
2.
- boot with a display
- switch to vt1
- detach & attach the display
- hit a key, the display should wake up
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