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On 2015-10-27T01:43:10+00:00 Eric Biggers wrote:

Created attachment 119210
dmesg.gz

Running Linux 4.3-rc7 on a laptop with Intel Skylake integrated
graphics, I encountered warnings in the kernel log and a several second
hang during boot. Furthermore, an external monitor attached to the HDMI
input did not work.  The problems occur every boot.  The full dmesg
output with drm.debug=14 is attached; some highlights are shown below:

[    1.401196] [drm:intel_dp_aux_ch] *ERROR* dp aux hw did not signal timeout (has irq: 1)!
[    1.414508] [drm:intel_dp_aux_ch] *ERROR* dp aux hw did not signal timeout (has irq: 1)!
[    1.427851] [drm:intel_dp_aux_ch] *ERROR* dp aux hw did not signal timeout (has irq: 1)!
[    1.427853] [drm:intel_dp_aux_ch] *ERROR* dp_aux_ch not done status 0xad40001f
[    1.447865] ------------[ cut here ]------------

[    1.447867] WARNING: CPU: 1 PID: 6 at drivers/gpu/drm/i915/intel_dp.c:854 intel_dp_aux_ch+0x10f/0x6a0()
[    1.447867] dp_aux_ch not started status 0xad40001f
...
[    8.043643] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 130
...
[   32.571277] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 130
...
[   32.608835] i915 0000:00:02.0: HDMI-A-1: EDID block 0 invalid.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1572901/comments/0

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On 2015-10-28T14:30:48+00:00 Timo Aaltonen wrote:

seeing same on SKL21-SDS, with the added fun that eDP stays blank until
drm-intel-next-2015-09-28-merged.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1572901/comments/1

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On 2015-10-28T14:35:55+00:00 Timo Aaltonen wrote:

..until the first DPMS cycle, returning from it makes things work

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1572901/comments/2

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On 2015-11-13T14:24:56+00:00 Ander Conselvan de Oliveira wrote:

Created attachment 119641
Fix SKL DP AUX CH clock divider

Could you give this patch a try?

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1572901/comments/3

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On 2015-11-13T14:35:08+00:00 Ander Conselvan de Oliveira wrote:

Created attachment 119642
Fix SKL DP AUX CH clock divider

There was a typo on the previous patch.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1572901/comments/4

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On 2015-11-14T01:21:35+00:00 Eric Biggers wrote:

I tested Linux 4.3 with your patch applied, but it did not solve the
problem.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1572901/comments/5

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On 2015-11-23T03:20:49+00:00 Eric Biggers wrote:

Update: with Linux 4.4-rc2, the "dp_aux_ch not started" warning is gone,
and there is no longer a several second hang on boot or when changing
the screen resolution.

However, the HDMI output continues to be broken, and the log messages
about the EDID checksum being invalid still appear.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1572901/comments/6

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On 2015-11-25T05:51:20+00:00 Eric Biggers wrote:

I updated the bug title to reflect the fact that the HDMI output not
working (because of the invalid EDID checksum) is now the only problem
for me.  So there must have been two separate problems originally, one
of which was solved by the 4.4 merges.

I tried hacking the i915 driver code in a few different ways but none of
them solved the problem:

- always setting force_bit=1 on the 'struct intel_gmbus'
- changing the drm_i915_private hotplug_work to a delayed_work and scheduling it with delay 400 ms
- increasing the number of retries in drm_do_get_edid() from 4 to 32
- increasing the number of retries of the "live status" check in intel_hdmi_detect() from 3 to 30

Also, I verified that the same monitor and VGA->HDMI adapter works on a
Raspberry Pi.  So that leaves the Skylake hardware and/or the i915
driver as the source of the problem.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1572901/comments/7

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On 2015-11-25T08:11:39+00:00 Jani-nikula wrote:

Please add drm.debug=14 module parameter, and attach dmesg all the way
from boot to the problem, running v4.4-rc2 or later. Please attach plain
text dmesg only, not compressed.

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https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1572901/comments/8

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On 2015-11-26T02:47:51+00:00 Eric Biggers wrote:

Created attachment 120126
dmesg

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1572901/comments/9

------------------------------------------------------------------------
On 2015-11-26T02:50:56+00:00 Eric Biggers wrote:

Attached the log as requested.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1572901/comments/10

------------------------------------------------------------------------
On 2016-01-24T17:16:45+00:00 Eric Biggers wrote:

Update:

Using a different cable, which connects the DVI input of the monitor to
the HDMI output of the Skylake GPU, everything works as expected.

The non-working setup used a different adapter that connected the VGA
input of the monitor to the HDMI output of the Skylake GPU.

So, the issue manifests itself with particular adapters and not with the
HDMI output itself.  It's also possible that everything works as
intended on the Skylake side and the particular (brand new) adapter I
used was "bad".  However, I don't currently have any other HDMI->VGA
adapters to test.

I will leave this bug open for now as several people are watching it,
and it's possible they have encountered similar problems.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1572901/comments/11

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On 2016-01-25T09:19:37+00:00 Jani-nikula wrote:

HDMI->DVI is just wires.

HDMI->VGA is an active protocol converter.

The more complex stuff always has more ways to go wrong, both in the
adapter and in the driver.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1572901/comments/12


** Changed in: linux
       Status: Unknown => Confirmed

** Changed in: linux
   Importance: Unknown => Medium

-- 
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https://bugs.launchpad.net/bugs/1572901

Title:
  i915: No HDMI output with 4.4

Status in Linux:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  This bug affects 16.04:

  https://lists.freedesktop.org/archives/dri-
  devel/2016-February/101483.html

  Any chance we can get a fix backported?
  --- 
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0p:   braderhart   1996 F...m pulseaudio
   /dev/snd/controlC0:  braderhart   1996 F.... pulseaudio
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=409e5bdd-989a-4ccb-a09f-31e55d210887
  InstallationDate: Installed on 2016-04-21 (0 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  MachineType: LENOVO 20132
  Package: linux (not installed)
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:
   0 inteldrmfb
   1 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-21-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash video=HDMI-A-1:e vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-21-generic N/A
   linux-backports-modules-4.4.0-21-generic  N/A
   linux-firmware                            1.157
  Tags:  xenial
  Uname: Linux 4.4.0-21-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 08/23/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 5DCN89WW(V8.00)
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: INVALID
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900003WIN8 STD MLT
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo IdeaPad Y580
  dmi.modalias: dmi:bvnLENOVO:bvr5DCN89WW(V8.00):bd08/23/2012:svnLENOVO:pn20132:pvrLenovoIdeaPadY580:rvnLENOVO:rnINVALID:rvr31900003WIN8STDMLT:cvnLENOVO:ct10:cvrLenovoIdeaPadY580:
  dmi.product.name: 20132
  dmi.product.version: Lenovo IdeaPad Y580
  dmi.sys.vendor: LENOVO

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