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[TJ <ubuntu@xxxxxx>]

Clean install of 16.04 amd64.

Testing with an updated kernel won't help since I've so far been unable
to determine a scenario which can reliably reproduce the issue. If/when
that is possible I'll test.

I do however routinely operate with my own mainline kernel builds so
reproducing may be hit-and-miss.

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https://bugs.launchpad.net/bugs/1578528

Title:
  inteldrmfb: blank VT consoles after many suspend/resume cycles

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  16.04 on an Asus T300CHI (Intel GPU).

  $ uname -a
  Linux T300CHI 4.4.0-21-lowlatency #37-Ubuntu SMP PREEMPT Mon Apr 18 20:20:26 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

  I found today that switching from X to the VT consoles resulted in a
  blank screen. Switching between VTs likewise. Switching back to the
  GUI on tty7 the (GUI) display returns.

  The system was last booted 4 or 5 days ago and has been through
  several suspend/resume cycles since then.

  Whilst switched to tty1 using a remote SSH shell I adjusted the
  backlight brightness but without revealing any text.

  I then did a blind login and the remote SSH shell showed  a login and
  shell process were started. This seems to indicate the problem is in
  the framebuffer driver.

  I did a system restart and found the VT consoles working fine. I did
  several suspend/resume cycles but so far was unable to reproduce the
  issue.

  I suspect I've not done enough cycles yet, or alternatively the issue
  is triggered by something I did during the previous 5-day boot session
  although I cannot think of anything obvious that could have this
  effect.

  $ lspci -nn
  00:00.0 Host bridge [0600]: Intel Corporation Broadwell-U Host Bridge -OPI [8086:1604] (rev 09)
  00:02.0 VGA compatible controller [0300]: Intel Corporation Broadwell-U Integrated Graphics [8086:161e] (rev 09)
  00:03.0 Audio device [0403]: Intel Corporation Broadwell-U Audio Controller [8086:160c] (rev 09)
  00:04.0 Signal processing controller [1180]: Intel Corporation Broadwell-U Camarillo Device [8086:1603] (rev 09)
  00:14.0 USB controller [0c03]: Intel Corporation Wildcat Point-LP USB xHCI Controller [8086:9cb1] (rev 03)
  00:16.0 Communication controller [0780]: Intel Corporation Wildcat Point-LP MEI Controller #1 [8086:9cba] (rev 03)
  00:1b.0 Audio device [0403]: Intel Corporation Wildcat Point-LP High Definition Audio Controller [8086:9ca0] (rev 03)
  00:1c.0 PCI bridge [0604]: Intel Corporation Wildcat Point-LP PCI Express Root Port #1 [8086:9c90] (rev e3)
  00:1c.3 PCI bridge [0604]: Intel Corporation Wildcat Point-LP PCI Express Root Port #4 [8086:9c96] (rev e3)
  00:1f.0 ISA bridge [0601]: Intel Corporation Wildcat Point-LP LPC Controller [8086:9cc7] (rev 03)
  00:1f.2 SATA controller [0106]: Intel Corporation Wildcat Point-LP SATA Controller [AHCI Mode] [8086:9c83] (rev 03)
  00:1f.3 SMBus [0c05]: Intel Corporation Wildcat Point-LP SMBus Controller [8086:9ca2] (rev 03)
  02:00.0 Network controller [0280]: Intel Corporation Wireless 7265 [8086:095a] (rev 59)

  [    0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-4.4.0-21-lowlatency root=/dev/mapper/VG02-rootfs ro no_console_suspend initcall_debug debug acpi_osi=! "acpi_osi=Windows 2013" splash vt.handoff=7
  [    0.000000] console [tty0] enabled
  [    0.058719] calling  early_efi_map_fb+0x0/0x38 @ 1
  [    0.058721] initcall early_efi_map_fb+0x0/0x38 returned 0 after 0 usecs
  [    0.092260] calling  vtconsole_class_init+0x0/0xbd @ 1
  [    0.092273] initcall vtconsole_class_init+0x0/0xbd returned 0 after 0 usecs
  [    0.111130] calling  fbmem_init+0x0/0x94 @ 1
  [    0.111138] initcall fbmem_init+0x0/0x94 returned 0 after 0 usecs
  [    0.147791] vgaarb: setting as boot device: PCI:0000:00:02.0
  [    0.147793] vgaarb: device added: PCI:0000:00:02.0,decodes=io+mem,owns=io+mem,locks=none
  [    0.147795] vgaarb: loaded
  [    0.147796] vgaarb: bridge control possible 0000:00:02.0
  [    0.158091] calling  proc_consoles_init+0x0/0x22 @ 1
  [    0.158096] initcall proc_consoles_init+0x0/0x22 returned 0 after 0 usecs
  [    0.158293] calling  fb_console_init+0x0/0xfc @ 1
  [    0.158316] initcall fb_console_init+0x0/0xfc returned 0 after 20 usecs
  [    0.158319] calling  simplefb_init+0x0/0x14 @ 1
  [    0.158335] initcall simplefb_init+0x0/0x14 returned 0 after 14 usecs
  [    0.504272] calling  sysfb_init+0x0/0x92 @ 1
  [    0.504292] initcall sysfb_init+0x0/0x92 returned 0 after 15 usecs
  [    0.509020] calling  imsttfb_init+0x0/0x10b @ 1
  [    0.509031] initcall imsttfb_init+0x0/0x10b returned 0 after 8 usecs
  [    0.509033] calling  asiliantfb_init+0x0/0x34 @ 1
  [    0.509042] initcall asiliantfb_init+0x0/0x34 returned 0 after 6 usecs
  [    0.509045] calling  vesafb_driver_init+0x0/0x14 @ 1
  [    0.509055] initcall vesafb_driver_init+0x0/0x14 returned 0 after 6 usecs
  [    0.509058] calling  efifb_driver_init+0x0/0x14 @ 1
  [    0.509063] efifb: probing for efifb
  [    0.509071] efifb: framebuffer at 0xe0000000, mapped to 0xffffc90001000000, using 14400k, total 14400k
  [    0.509073] efifb: mode is 2560x1440x32, linelength=10240, pages=1
  [    0.509073] efifb: scrolling: redraw
  [    0.509075] efifb: Truecolor: size=8:8:8:8, shift=24:16:8:0
  [    0.509204] fb0: EFI VGA frame buffer device
  [    0.509211] initcall efifb_driver_init+0x0/0x14 returned 0 after 147 usecs
  [    0.696228] fb: switching to inteldrmfb from EFI VGA
  [    0.696355] [drm] Replacing VGA console driver
  [    0.708165] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
  [    0.810884] fbcon: inteldrmfb (fb0) is primary device
  [    0.811207] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device

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