[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

** Changed in: linux (Ubuntu)
   Status: In Progress => Incomplete

** Changed in: linux (Ubuntu Xenial)
   Status: In Progress => Incomplete

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  Regression: S-video output does not work

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

Thanks for testing Yakkety.  I reviewed the git logs between Xenail and
Yakkety and there are many drm commits.  It would be easiest to perform
a Reverse bisect.

Commit 14de6c44d was added to Yakkety in Ubuntu-4.6.0-0.1.   Can you test the 
following kernel:
https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/bootstrap/+build/10600030

For a reverse bisect, we need to find the last bad kernel and first good
one.

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

S-video works by 4.8 based Yakkety kernel.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

Sorry the status was changed, wrong bug.

Just to confirm, this bug does not exists with the Yakkety?  If that is
the case, there is another commit there that fixes this bug, since
yakkety does in fact contain commit 14de6c44d.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

** Changed in: linux (Ubuntu)
   Status: Incomplete => Triaged

** Changed in: linux (Ubuntu Xenial)
   Status: Incomplete => Triaged

** Changed in: linux (Ubuntu)
   Status: Triaged => In Progress

** Changed in: linux (Ubuntu Xenial)
   Status: Triaged => In Progress

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

Why incomplete?

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

** Changed in: linux (Ubuntu)
   Status: In Progress => Incomplete

** Changed in: linux (Ubuntu Xenial)
   Status: In Progress => Incomplete

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

It works. But colors are gone. Also with 4.4.0-22-generic. Maybe my
hardware is breaking. I also tried to install linux-generic-
hwe-16.04-edge to get newer kernel, but apt failed to fetch the .debs.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

It looks like commit 14de6c44d is in the Ubuntu 4.4 based kernel(It was
added to resolve bug 1542939).  However, the commit was never applied to
upstream 4.4.  That would explain why the bug does not exist in upstream
4.4, but it does in 4.4 based Xenial.

Can you see if this bug also exists in the 4.8 based Yakkety kernel?  If
it does, we may just have to revert 14de6c44d in Xenial.

The Yakkety kernel is available from:
https://launchpad.net/~canonical-kernel-security-team/+archive/ubuntu/ppa/+build/11288461

If the bug does exist in Yakkety, we could also see if this bug still exists in 
current mainline:
 http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.9-rc8

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

The kernel does not resolve the bug.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

The -proposed kernel should be kernel 4.4.0-52.73.  Can you run sudo
apt-get update again?

If you still don't get the kernel, it can be downloaded directly from:
https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/ppa/+build/11278866

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

I get the same kernel (4.4.0.51.54) via , xenial-updates, xenial-
security and xenial-proposed now. The bug is not fixed.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

Those updates should get applied during this stable release cycle.  Here
is the current schedule:

Current cycle: 25-Nov through 17-Dec

 25-Nov   Last day for kernel commits for this cycle
28-Nov - 03-Dec   Kernel prep week.
04-Dec - 16-Dec   Bug verification & Regression testing..
 19-Dec   Release to -updates.


The -proposed kernel now has up to the 4.4.35 updates.

Would it be possible for you to test this latest kernel and post back if it 
resolves this bug?
See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to 
enable and use -proposed.

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

Yes, it has landed there. Will it land to Xenial soon?

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

Can you test the upstream stable 4.4 kernel to see if the fix has landed
there yet?  It is available from:

http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.34/

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

I am looking forward to seeing the bug fixed in kernel updates for
Xenial.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

Thanks for testing.  I'll review the commit logs and ping the patch
author and see if he knows which commit now fixes this bug in mainline.
We can then SRU that commit to Xenial.

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
   Status: New

** Changed in: linux (Ubuntu Xenial)
   Status: New => Confirmed

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => High

** Changed in: linux (Ubuntu)
 Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Xenial)
 Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu)
   Status: Confirmed => In Progress

** Changed in: linux (Ubuntu Xenial)
   Status: Confirmed => In Progress

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

4.9-rc2 does not have the bug.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

Thanks for all the testing, I will contact the patch author for
feedback.  Can you run one additional test?  Can you test the latest
mainline kernel to see if there is already a fix for the bug?  The
4.9-rc2 kernel can be downloaded from:

http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.9-rc2/

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

It does not have the bug.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

The bisect reported the following as the first bad commit:

commit 386e0f97a585fa6a6d4aad767884a760ce3c0782
Author: Maarten Lankhorst 
Date:   Mon May 9 18:16:48 2016 -0600

drm/atomic: Remove drm_atomic_connectors_for_crtc.

This is also commit 14de6c44d14 in mainline.

I built a test kernel with this commit reverted.  The test kernel can be 
downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1608236

Can you test that kernel and report back if it has the bug or not?

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

That has the bug.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

I built the final test kernel for the bisect, up to the following commit:
386e0f97a585fa6a6d4aad767884a760ce3c0782

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1608236

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

Thanks in advance

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

The bug seems not to exits in that one. Note that I did not remove
earlier test 4.4.0-23-generic kernel before installing this one.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

I built the next test kernel, up to the following commit:
732ce11060c0c4f7c2fa2d286e1006173fbd0904

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1608236

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

There is only one more kernel to test after this one.

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

The bug does not exist in the kernel.

We have already spent over 2 months to find the right kernel :(

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

I built the next test kernel, up to the following commit:
09535375a6da2c09497ef650a5de415148dd3b3b

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1608236

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

Thanks in advance

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

That kernel has the bug.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

I built the next test kernel, up to the following commit:
3d26b8d8361a9cfa098fe8548f1836573925cc7d

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1608236

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

Thanks in advance

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

Was it all?

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

It does not have the bug.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

I built the next test kernel, up to the following commit:
c708299477b8592ae6e019aeff18f3b5e833ccea

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1608236

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

Thanks in advance

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

It does not have the bug.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

I built the next test kernel, up to the following commit:
dcf9fa00268dd24d9ecaa4f84cc6d07de8bd86a7

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1608236

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

Thanks in advance

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

It has the bug.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

I built the next test kernel, up to the following commit:
3bfd2ce586e9ed143c10263981a6ec7fa5b40890

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1608236

Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on your test results.

Thanks in advance

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

I tested the kernel in lp1608236. S-video works.

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

For what it is worth, S-video works by v4.8-rc5

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

Could this bug be presented in some mailing list that the kernels
developers follow? I still think that a developer may recognize he/she
has contributed to the relevant part of code and find the cause of the
bug more easily.

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

Can you give me a link to the commit log?

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

There are 261 commits between 4.4.0-22 and 4.4.0-23. It's difficult to
tell which change caused this regression just by looking at the git log.
A bisect would narrow down the exact commit that introduced this bug,
and tell us who the author is to contact.

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

That sounds like a brute force method to me. Is it possible to contact
the developers who made changes to those kernels and ask if they have an
idea?

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

I started a kernel bisect between 4.4.0-22 and 4.4.0-23. The kernel
bisect will require testing of about 7-10 test kernels.

I built the first test kernel, up to the following commit:
986aed37359b5c7dc72e0cc7217cbd48fc8efe7a

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1608236

Can you test that kernel and report back if it has the bug or not?  I
will build the next test kernel based on your test results.

Thanks in advance

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

4.4.0-23 is bad, too

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

Sorry, here are the correct links:

4.4.0-23: 
https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/ppa/+build/9755583
4.4.0-24: 
https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/ppa/+build/9887713

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

No, because the links you gave are for 4.4.0-8 and 4.4.0-9.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

Thanks.  So we now know 4.4.0-22 is good and 4.4.0-25 is bad.  Can you
next try 4.4.0-23 and 4.4.0-24:


4.4.0-23: https://launchpad.net/ubuntu/+source/linux/4.4.0-8.23/+build/9059173
4.4.0-24: https://launchpad.net/ubuntu/+source/linux/4.4.0-9.24/+build/9279168

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

The bug occurs with 4.4.0-25.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

Sorry, this is the correct link:

https://launchpad.net/~canonical-kernel-
team/+archive/ubuntu/ppa/+build/9900269

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

With 4.4.0-10 it works as it used to.

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

I can not find 4.4.0-25 there, but 4.4.0-10.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

Thanks for testing.  We should narrow it down a bit more.  Can you next
test 4.4.0-25?  It's available from:

https://launchpad.net/ubuntu/+source/linux/4.4.0-10.25/+build/9287900

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

The bug occurs when booted 4.4.0-29-generic.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

Can you test the 4.4.0-29 kernel as well?  A link to that kernel is
posted in comment #8.

Note, with that kernel you need to install both the linux-image and
linux-image-extra .deb packages.

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

4.4.0-22 does not have the bug.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

So 4.4.0-22 has the bug, but 4.4.0-31 does have the bug?  From your
testing of upstream 4.4.17 in comment #4 this sounds like it is related
to an Ubuntu specific SAUCE patch.  This would be confirmed by your test
results of the -proposed kernel.

We can perform a kernel bisect to identify the commit that introduced
this regression.  We first need to identify the last good Ubuntu kernel
and the first bad one.  If -22 is good, we probably want to test
4.4.0-29 next.  It can be downloaded from:

https://launchpad.net/~canonical-kernel-
team/+archive/ubuntu/ppa/+build/10184098

** Tags added: performing-bisect

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

Also problem with this system http://askubuntu.com/q/814358/21005

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

I installed linux-image-4.4.0-36-generic (4.4.0-36.55) and xserver-xorg-
video-intel (2:2.99.917+git20160325-1ubuntu1.1) from Proposed.

It did not resolve this bug.

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

The proposed Xenial kernel is now based on 4.4.16 and available in the 
-proposed repository.  Would it be possible for you to test this latest kernel 
and post back if it resolves this bug?
See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to 
enable and use -proposed. 

Thank you in advance!

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[Bug 1608236] Re: Regression: S-video output does not work

[Jarno Suni]

I tried with 4.4.17-040417-generic.
Booting jammed in some startup job of cryptswap, but S-video output worked 
during boot unlike with other kernel.

** Tags added: kernel-fixed-upstream

** Changed in: linux (Ubuntu)
   Status: Triaged => Confirmed

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[Bug 1608236] Re: Regression: S-video output does not work

[Joseph Salisbury]

Would it be possible for you to test the latest upstream stable kernel?
Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the
latest v4.4 stable kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, 
please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as 
"Confirmed".


Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.16

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu)
   Status: Confirmed => Incomplete

** Changed in: linux (Ubuntu)
   Importance: Medium => High

** Changed in: linux (Ubuntu)
   Status: Incomplete => Triaged

** Tags added: kernel-da-key

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