[Bug 1489147] Re: Booting live Wily image results in black screen with or without random text

[Karl Kastner]

Upgrade from vivid amd64. Similar problem here. Background light
switches on and off every two seconds. Same for external monitor.

CPU: Intel(R) Core(TM) i7-4710MQ CPU @ 2.50GHz
Graphics: GM107M [GeForce GTX 860M] NVIDIA Corporation

It is not the kernel, booting an old kernel results into the same
problem.

Sometimes there are two junk characters on the screen, sometimes the
following error message is displayed:

[drm:intel_dp_start_link_train] *ERROR* failed to enable link training
[drm:intel_dp_complete_link_train] *ERROR* failed to start channel equalization

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https://bugs.launchpad.net/bugs/1489147

Title:
  Booting live Wily image results in black screen with or without random
  text

Status in casper package in Ubuntu:
  Confirmed

Bug description:
  I've run into this testing both the amd64 and i386 Ubuntu GNOME
  20150826.1 images. But it only occurs after selecting Try Ubuntu from
  the normal boot screen. If you boot the same image and choose try
  Ubuntu from the advanced boot screen the live DE boots just fine. I've
  been able to reproduce this behavior on two of three sets of hardware,
  but not the third.

  The two sets of hardware affected are:

  AMD Sempron Processor LE-1250 @ 2.2 GHz
  nVidia C61 [GeForce 7025 / nForce 630a] (rev a2)
  nVidia MCP61 High Definition Audio (rev a2)
  nVidia MCP61 Ethernet (rev a2)
  2GB DDR2 RAM

  Intel Motherboard: DB43LD
  Intel Pentium Dual-Core CPU E5300 @ 2.60GHz
  Intel Corporation 4 Series Chipset Integrated Graphics Controller (rev 03)
  Intel Corporation 82801JD/DO (ICH10 Family) HD Audio Controller (rev 02)
  00:19.0 Ethernet controller: Intel Corporation 82567LM-3 Gigabit Network Connection (rev 02)
  3GB DDR2 RAM

  The set of hardware I've not been able to reproduce this on is:

  Intel Atom CPU  230 @ 1.60GHz
  Intel 82945G/GZ Integrated Graphics Controller (rev 02)
  Intel N10/ICH 7 Family High Definition Audio Controller (rev 01)
  Realtek RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 02)
  2GB DDR2 RAM

  I'm attaching a picture of the actual screen after freezing - sorry
  it's kind of blurry, but I'm shaky ATM.

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