[Bug 1683445] Re: E6430 brightness control not working

[Rex Tsai]

** Changed in: oem-priority
   Status: Confirmed => Fix Released

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[Bug 1683445] Re: E6430 brightness control not working

[Yuan-Chen Cheng]

** Changed in: oem-priority
   Importance: Critical => High

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[Bug 1683445] Re: E6430 brightness control not working

[Launchpad Bug Tracker]

This bug was fixed in the package unity-settings-daemon -
15.04.1+16.04.20160701-0ubuntu2

---
unity-settings-daemon (15.04.1+16.04.20160701-0ubuntu2) xenial; urgency=medium

  [ Kai-Heng Feng ]
  * power: Choose correct backlight device on laptops with hybrid graphics
(LP: #1683445)
Backported from gnome-settings-daemon commit ed7c2744

 -- Sebastien Bacher   Tue, 03 Jul 2018 16:31:09
+0200

** Changed in: unity-settings-daemon (Ubuntu Xenial)
   Status: Fix Committed => Fix Released

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[Bug 1683445] Re: E6430 brightness control not working

[Sebastien Bacher]

The 15.04.1+16.04.20160701-0ubuntu2 xenial update works without visible
problem. We don't have people with the right laptop to verify the change
at the moment but since the same code change got verified with success
on bionic and that we didn't see any regression/problem on other
configurations let's mark it as verified (especially that we want to
clear the SRU line for another update)

** Tags removed: verification-needed verification-needed-xenial
** Tags added: verification-done verification-done-xenial

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[Bug 1683445] Re: E6430 brightness control not working

[Mathew Hodson]

** Changed in: gnome-settings-daemon (Ubuntu Xenial)
   Importance: Undecided => Medium

** Changed in: unity-settings-daemon (Ubuntu Xenial)
   Importance: Undecided => Medium

** Changed in: unity-settings-daemon (Ubuntu Bionic)
   Importance: Undecided => Medium

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[Bug 1683445] Re: E6430 brightness control not working

[Launchpad Bug Tracker]

This bug was fixed in the package unity-settings-daemon -
15.04.1+18.04.20180413-0ubuntu1.1

---
unity-settings-daemon (15.04.1+18.04.20180413-0ubuntu1.1) bionic; urgency=medium

  [ Kai-Heng Feng ]
  * power: Choose correct backlight device on laptops with hybrid graphics
(LP: #1683445)
Backported from gnome-settings-daemon commit ed7c2744

 -- Sebastien Bacher   Tue, 03 Jul 2018 11:27:01
+0200

** Changed in: unity-settings-daemon (Ubuntu Bionic)
   Status: Fix Committed => Fix Released

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[Bug 1683445] Re: E6430 brightness control not working

[Bartosz Kosiorek]

After install unity-settings-daemon from proposed on Ubuntu Bionic with Dell 
Latitude E6430, brightness is working correctly.
Verification done.

** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic

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[Bug 1683445] Re: E6430 brightness control not working

[Will Cooke]

I've asked our OEM team to look for the hardware to test this on, but they 
haven't got any. 
We're in the position that as far as we can tell nothing is made *worse* by 
this change, but we can't be sure if it actually fixes the problem or not.  I 
think this is safe to land now, but if anyone has hardware to test this on, 
please help.

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Re: [Bug 1683445] Re: E6430 brightness control not working

[Vincent Gerris]

Hi,

Unfortunately I'm unable to test, I don't have the laptop anymore.

Kind regards,
Vincent


Den mån 9 juli 2018 14:31Łukasz Zemczak <1683...@bugs.launchpad.net> skrev:

> Hello Vincent, or anyone else affected,
>
> Accepted unity-settings-daemon into bionic-proposed. The package will
> build now and be available at https://launchpad.net/ubuntu/+source
> /unity-settings-daemon/15.04.1+18.04.20180413-0ubuntu1.1
> 
> in a few hours,
> and then in the -proposed repository.
>
> Please help us by testing this new package.  See
> https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
> to enable and use -proposed.Your feedback will aid us getting this
> update out to other Ubuntu users.
>
> If this package fixes the bug for you, please add a comment to this bug,
> mentioning the version of the package you tested and change the tag from
> verification-needed-bionic to verification-done-bionic. If it does not
> fix the bug for you, please add a comment stating that, and change the
> tag to verification-failed-bionic. In either case, without details of
> your testing we will not be able to proceed.
>
> Further information regarding the verification process can be found at
> https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
> advance!
>
> ** Changed in: unity-settings-daemon (Ubuntu Bionic)
>Status: New => Fix Committed
>
> ** Tags removed: verification-done
> ** Tags added: verification-needed verification-needed-bionic
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1683445
>
> Title:
>   E6430 brightness control not working
>
> Status in GNOME Settings Daemon:
>   Fix Released
> Status in Nouveau Xorg driver:
>   Won't Fix
> Status in OEM Priority Project:
>   Confirmed
> Status in gnome-settings-daemon package in Ubuntu:
>   Fix Released
> Status in unity-settings-daemon package in Ubuntu:
>   Fix Released
> Status in gnome-settings-daemon source package in Xenial:
>   Confirmed
> Status in unity-settings-daemon source package in Xenial:
>   Confirmed
> Status in gnome-settings-daemon source package in Zesty:
>   Fix Released
> Status in unity-settings-daemon source package in Zesty:
>   Won't Fix
> Status in unity-settings-daemon source package in Bionic:
>   Fix Committed
>
> Bug description:
>   Impact
>   --
>   It looks like GNOME's brightness control simply used the first backlight
> device it saw instead of one currently in use. This meant that the
> brightness control would not work on some computers with multiple GPUs.
>
>   Test Case
>   -
>   From Ubuntu GNOME 17.04 on a dual-GPU computer, install the update.
>   Restart.
>   Does the brightness control now work correctly?
>
>   Regression Potential
>   
>   This looks like a minimal fix for this issue. It was accepted as part of
> gnome-settings-daemon 3.24.2 which all GNOME 3.24 distros  will be
> upgrading to.
>
>   Original Bug Report
>   ---
>   The Dell E6430 with Nvidia Optimus enables in BIOS, using the Open
> Source Nouveau driver shows the brightness slider moving but does not
> affect the brightness.
>
>   When using the kernel boot option acpi_backlight=vendor , the
>   brightness control works.
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 17.04
>   Package: linux-image-4.10.0-19-generic 4.10.0-19.21
>   ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
>   Uname: Linux 4.10.0-19-generic x86_64
>   NonfreeKernelModules: wl
>   ApportVersion: 2.20.4-0ubuntu4
>   Architecture: amd64
>   AudioDevicesInUse:
>USERPID ACCESS COMMAND
>/dev/snd/controlC0:  ubuntu 2081 F pulseaudio
>   CurrentDesktop: Unity:Unity7
>   Date: Mon Apr 17 20:00:56 2017
>   HibernationDevice: RESUME=UUID=66528b53-0f42-4043-9ff8-da8f86036be6
>   InstallationDate: Installed on 2017-04-10 (7 days ago)
>   InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Beta amd64 (20170321)
>   MachineType: Dell Inc. Latitude E6430
>   ProcFB:
>0 nouveaufb
>1 inteldrmfb
>   ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-19-generic.efi.signed
> root=UUID=4e08c33d-f8cf-4159-a559-a0463d67b96c ro quiet splash
> acpi_backlight=vendor vt.handoff=7
>   RelatedPackageVersions:
>linux-restricted-modules-4.10.0-19-generic N/A
>linux-backports-modules-4.10.0-19-generic  N/A
>linux-firmware 1.164
>   SourcePackage: linux
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   dmi.bios.date: 01/18/2016
>   dmi.bios.vendor: Dell Inc.
>   dmi.bios.version: A18
>   dmi.board.name: 0H3MT5
>   dmi.board.vendor: Dell Inc.
>   dmi.board.version: A00
>   dmi.chassis.type: 9
>   dmi.chassis.vendor: Dell Inc.
>   dmi.modalias:
> 

[Bug 1683445] Re: E6430 brightness control not working

[Łukasz Zemczak]

Hello Vincent, or anyone else affected,

Accepted unity-settings-daemon into xenial-proposed. The package will
build now and be available at https://launchpad.net/ubuntu/+source
/unity-settings-daemon/15.04.1+16.04.20160701-0ubuntu2 in a few hours,
and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-xenial to verification-done-xenial. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-xenial. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: unity-settings-daemon (Ubuntu Xenial)
   Status: Confirmed => Fix Committed

** Tags added: verification-needed-xenial

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[Bug 1683445] Re: E6430 brightness control not working

[Łukasz Zemczak]

Hello Vincent, or anyone else affected,

Accepted unity-settings-daemon into bionic-proposed. The package will
build now and be available at https://launchpad.net/ubuntu/+source
/unity-settings-daemon/15.04.1+18.04.20180413-0ubuntu1.1 in a few hours,
and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-bionic to verification-done-bionic. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-bionic. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: unity-settings-daemon (Ubuntu Bionic)
   Status: New => Fix Committed

** Tags removed: verification-done
** Tags added: verification-needed verification-needed-bionic

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[Bug 1683445] Re: E6430 brightness control not working

[Sebastien Bacher]

** Changed in: unity-settings-daemon (Ubuntu Zesty)
   Status: Triaged => Won't Fix

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[Bug 1683445] Re: E6430 brightness control not working

[Launchpad Bug Tracker]

This bug was fixed in the package unity-settings-daemon -
15.04.1+18.04.20180413-0ubuntu2

---
unity-settings-daemon (15.04.1+18.04.20180413-0ubuntu2) cosmic; urgency=medium

  [ Kai-Heng Feng ]
  * power: Choose correct backlight device on laptops with hybrid graphics
(LP: #1683445)
Backported from gnome-settings-daemon commit ed7c2744

 -- Sebastien Bacher   Tue, 03 Jul 2018 11:27:01
+0200

** Changed in: unity-settings-daemon (Ubuntu)
   Status: Triaged => Fix Released

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[Bug 1683445] Re: E6430 brightness control not working

[Yuan-Chen Cheng]

need fix in xenial.

** Changed in: oem-priority
   Status: New => Confirmed

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[Bug 1683445] Re: E6430 brightness control not working

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: gnome-settings-daemon (Ubuntu Xenial)
   Status: New => Confirmed

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[Bug 1683445] Re: E6430 brightness control not working

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: unity-settings-daemon (Ubuntu Xenial)
   Status: New => Confirmed

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[Bug 1683445] Re: E6430 brightness control not working

[William Kao]

** Changed in: oem-priority
   Importance: Undecided => Critical

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[Bug 1683445] Re: E6430 brightness control not working

[Will Cooke]

** Also affects: gnome-settings-daemon (Ubuntu Xenial)
   Importance: Undecided
   Status: New

** Also affects: unity-settings-daemon (Ubuntu Xenial)
   Importance: Undecided
   Status: New

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[Bug 1683445] Re: E6430 brightness control not working

[Yuan-Chen Cheng]

** Also affects: oem-priority
   Importance: Undecided
   Status: New

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[Bug 1683445] Re: E6430 brightness control not working

[Mathew Hodson]

** No longer affects: linux (Ubuntu)

** Project changed: linux => nouveau

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[Bug 1683445] Re: E6430 brightness control not working

[Launchpad Bug Tracker]

This bug was fixed in the package gnome-settings-daemon -
3.24.2-0ubuntu0.1

---
gnome-settings-daemon (3.24.2-0ubuntu0.1) zesty; urgency=medium

  * New upstream release (LP: #1689610)
- Fix gdm starting with no plugins which broke Hi-DPI support
  on the login screen (LP: #1685035)
- Fix brightness control in some dual-GPU computers (LP: #1683445)
- Own the D-Bus name that the API documentation tells users of the
  multimedia keys API they should use (org.gnome.SettingsDaemon.MediaKeys),
  in addition to the D-Bus name that they actually use in practice
  (org.gnome.SettingsDaemon). (LP: #1686077)
  * Add revert-disable-rfkill-keys-handling.patch:
- Revert commit that disabled GNOME's rfkill handling. Although
  this fixes problems for some users, it makes things worse for
  other people.

 -- Jeremy Bicha   Tue, 09 May 2017 14:05:29 -0400

** Changed in: gnome-settings-daemon (Ubuntu Zesty)
   Status: Fix Committed => Fix Released

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[Bug 1683445] Re: E6430 brightness control not working

[Kai-Heng Feng]

I believe @Vicent uses Unity instead of Gnome - but I don't know when
will they handle my PR tough.

As for Ubuntu Gnome 17.04, I can confirm GSD in -proposed pocket fixes
the issue.

** Tags removed: verification-needed
** Tags added: verification-done

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[Bug 1683445] Re: E6430 brightness control not working

[Jeremy Bicha]

Vincent, is it at all possible for you to test Ubuntu GNOME 17.04 before
and after this proposed fix? I don't have the hardware to verify your
fix and the Ubuntu Stable Release Update team really likes for bugfixes
to be verified.

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[Bug 1683445] Re: E6430 brightness control not working

[Vincent Gerris]

Hi,


This is what I get now when I try the dev package from:

https://launchpad.net/ubuntu/zesty/amd64/gnome-settings-
daemon/3.24.2-0ubuntu0.1

sudo dpkg -i gnome-settings-daemon_3.24.2-0ubuntu0.1_amd64.deb 
[sudo] password for ubuntu: 
(Reading database ... 354908 files and directories currently installed.)
Preparing to unpack gnome-settings-daemon_3.24.2-0ubuntu0.1_amd64.deb ...
Unpacking gnome-settings-daemon (3.24.2-0ubuntu0.1) over (3.24.0-0ubuntu2) ...
dpkg: dependency problems prevent configuration of gnome-settings-daemon:
 gnome-settings-daemon depends on gnome-settings-daemon-schemas (= 
3.24.2-0ubuntu0.1); however:
  Version of gnome-settings-daemon-schemas on system is 3.24.0-0ubuntu2.

dpkg: error processing package gnome-settings-daemon (--install):
 dependency problems - leaving unconfigured
Processing triggers for hicolor-icon-theme (0.15-1) ...
Errors were encountered while processing:
 gnome-settings-daemon

so I downloaded that from:
https://launchpad.net/ubuntu/zesty/amd64/gnome-settings-daemon-schemas/3.24.2-0ubuntu0.1
and installed it.

Then I rebooted but there is not difference in behaviour.

Note that I use Unity, not Gnome.

When I installed these packages:
http://people.canonical.com/~khfeng/lp1683445/
it worked.

Thank you all!

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[Bug 1683445] Re: E6430 brightness control not working

[Łukasz Zemczak]

Hello Vincent, or anyone else affected,

Accepted gnome-settings-daemon into zesty-proposed. The package will
build now and be available at https://launchpad.net/ubuntu/+source
/gnome-settings-daemon/3.24.2-0ubuntu0.1 in a few hours, and then in the
-proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: gnome-settings-daemon (Ubuntu Zesty)
   Status: In Progress => Fix Committed

** Tags added: verification-needed

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[Bug 1683445] Re: E6430 brightness control not working

[Bug Watch Updater]

** Changed in: linux
   Status: Confirmed => Won't Fix

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[Bug 1683445] Re: E6430 brightness control not working

[Bug Watch Updater]

** Changed in: gnome-settings-daemon
   Status: Unknown => Fix Released

** Changed in: gnome-settings-daemon
   Importance: Unknown => Medium

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[Bug 1683445] Re: E6430 brightness control not working

[Jeremy Bicha]

** Also affects: gnome-settings-daemon via
   https://bugzilla.gnome.org/show_bug.cgi?id=782211
   Importance: Unknown
   Status: Unknown

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[Bug 1683445] Re: E6430 brightness control not working

[Kai-Heng Feng]

** Branch linked: lp:~kaihengfeng/unity-settings-daemon/lp1683445

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[Bug 1683445] Re: E6430 brightness control not working

[Launchpad Bug Tracker]

This bug was fixed in the package gnome-settings-daemon -
3.24.2-0ubuntu1

---
gnome-settings-daemon (3.24.2-0ubuntu1) artful; urgency=medium

  * New upstream release (LP: #1689610)
- Fix brightness control in some dual-GPU computers (LP: #1683445)
- Disable GNOME's rfkill handling which basically reverts this to
  how it worked or didn't in 16.04 LTS. Hopefully, a more thorough
  rework will be done in time for 3.26.
  * Drop patches applied in new release:
- git_fix-gdm-plugins.patch
- media-keys-Fix-mmkeys-D-Bus-API-to-match-API-docs.patch

 -- Jeremy Bicha   Tue, 09 May 2017 13:17:44 -0400

** Changed in: gnome-settings-daemon (Ubuntu)
   Status: Fix Committed => Fix Released

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[Bug 1683445] Re: E6430 brightness control not working

[Jeremy Bicha]

** Description changed:

- The Dell E6430 with Nvidia Optimus enables in BIOS, using the Open
- Source Nouveau driver shows the brightness slider moving but does not
- affect the brightness.
+ Impact
+ --
+ It looks like GNOME's brightness control simply used the first backlight 
device it saw instead of one currently in use. This meant that the brightness 
control would not work on some computers with multiple GPUs.
+ 
+ Test Case
+ -
+ From Ubuntu GNOME 17.04 on a dual-GPU computer, install the update.
+ Restart.
+ Does the brightness control now work correctly?
+ 
+ Regression Potential
+ 
+ This looks like a minimal fix for this issue. It was accepted as part of 
gnome-settings-daemon 3.24.2 which all GNOME 3.24 distros  will be upgrading to.
+ 
+ Original Bug Report
+ ---
+ The Dell E6430 with Nvidia Optimus enables in BIOS, using the Open Source 
Nouveau driver shows the brightness slider moving but does not affect the 
brightness.
  
  When using the kernel boot option acpi_backlight=vendor , the brightness
  control works.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: linux-image-4.10.0-19-generic 4.10.0-19.21
  ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
  Uname: Linux 4.10.0-19-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.4-0ubuntu4
  Architecture: amd64
  AudioDevicesInUse:
-  USERPID ACCESS COMMAND
-  /dev/snd/controlC0:  ubuntu 2081 F pulseaudio
+  USERPID ACCESS COMMAND
+  /dev/snd/controlC0:  ubuntu 2081 F pulseaudio
  CurrentDesktop: Unity:Unity7
  Date: Mon Apr 17 20:00:56 2017
  HibernationDevice: RESUME=UUID=66528b53-0f42-4043-9ff8-da8f86036be6
  InstallationDate: Installed on 2017-04-10 (7 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Beta amd64 (20170321)
  MachineType: Dell Inc. Latitude E6430
  ProcFB:
-  0 nouveaufb
-  1 inteldrmfb
+  0 nouveaufb
+  1 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-19-generic.efi.signed 
root=UUID=4e08c33d-f8cf-4159-a559-a0463d67b96c ro quiet splash 
acpi_backlight=vendor vt.handoff=7
  RelatedPackageVersions:
-  linux-restricted-modules-4.10.0-19-generic N/A
-  linux-backports-modules-4.10.0-19-generic  N/A
-  linux-firmware 1.164
+  linux-restricted-modules-4.10.0-19-generic N/A
+  linux-backports-modules-4.10.0-19-generic  N/A
+  linux-firmware 1.164
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/18/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A18
  dmi.board.name: 0H3MT5
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA18:bd01/18/2016:svnDellInc.:pnLatitudeE6430:pvr01:rvnDellInc.:rn0H3MT5:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E6430
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

** Changed in: gnome-settings-daemon (Ubuntu Zesty)
   Status: Triaged => In Progress

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[Bug 1683445] Re: E6430 brightness control not working

[Launchpad Bug Tracker]

** Branch linked: lp:~ubuntu-desktop/gnome-settings-daemon/ubuntu

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[Bug 1683445] Re: E6430 brightness control not working

[Jeremy Bicha]

I am closing the 'linux' portion of this bug because this apparently can
be fixed in gnome-settings-daemon and unity-settings-daemon.

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

** Changed in: gnome-settings-daemon (Ubuntu)
   Status: New => Fix Committed

** Changed in: gnome-settings-daemon (Ubuntu)
   Importance: Undecided => Medium

** Changed in: unity-settings-daemon (Ubuntu)
   Importance: Undecided => Medium

** Changed in: unity-settings-daemon (Ubuntu)
   Status: New => Triaged

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

** Also affects: gnome-settings-daemon (Ubuntu Zesty)
   Importance: Undecided
   Status: New

** Also affects: unity-settings-daemon (Ubuntu Zesty)
   Importance: Undecided
   Status: New

** Changed in: gnome-settings-daemon (Ubuntu Zesty)
   Importance: Undecided => Medium

** Changed in: gnome-settings-daemon (Ubuntu Zesty)
   Status: New => Triaged

** No longer affects: linux (Ubuntu Zesty)

** Changed in: unity-settings-daemon (Ubuntu Zesty)
   Status: New => Triaged

** Changed in: unity-settings-daemon (Ubuntu Zesty)
   Importance: Undecided => Medium

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[Bug 1683445] Re: E6430 brightness control not working

[Kai-Heng Feng]

** Also affects: gnome-settings-daemon (Ubuntu)
   Importance: Undecided
   Status: New

** Also affects: unity-settings-daemon (Ubuntu)
   Importance: Undecided
   Status: New

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[Bug 1683445] Re: E6430 brightness control not working

[Kai-Heng Feng]

BGO: https://bugzilla.gnome.org/show_bug.cgi?id=782211

** Bug watch added: GNOME Bug Tracker #782211
   https://bugzilla.gnome.org/show_bug.cgi?id=782211

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[Bug 1683445] Re: E6430 brightness control not working

[Kai-Heng Feng]

Please try USD here: http://people.canonical.com/~khfeng/lp1683445/

I'll send a patch to GSD/USD. It may take some time to backport it to
17.04 though.

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[Bug 1683445] Re: E6430 brightness control not working

[Vincent Gerris]

Hi,

Glad that it helps :).
I am not sure if the interface actually doesn't work, because it might if the 
Optimus mode would switch to use the Nvidia card dedicatedly, but since that is 
not supported by the nouveau driver, it might not happen. Not sure what 
happened to the Bumblebee projects and the likes and if it would affect this.
As long as an existing interface that is selected will always work, it could be 
omitted indeed.

Greetings,
Vincent

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[Bug 1683445] Re: E6430 brightness control not working

[Kai-Heng Feng]

Okay, didn't know the "enabled" part. Originally I was thinking get the
value from vgaswitheroo - but "enabled" here will do.

Though I still think nouveau shouldn't expose a backlight interface
under /sys with no function at all.

I'll work on GSD/USD as an alternative.

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[Bug 1683445] Re: E6430 brightness control not working

[Vincent Gerris]

Hi,

Thanks for your feedback. I had a chat with somebody with some experience and 
he suggested it should be fixed in userspace, here:
https://git.gnome.org/browse/gnome-settings-daemon/tree/plugins/power/gsd-backlight-linux.c

This is what he suggests (if the above is indeed what Ubuntu uses,
because it is meant for Fedora):

In the gsd_backlight_helper_get_best_backlight helper.
It only looks at the type of backlight and not at the connection between the 
backlight interface and the connector.
An  option is, if the gsd_backlight_helper_get_type (devices, "firmware")
and gsd_backlight_helper_get_type (devices, "platform") calls both
are unsuccessful, then instead of using gsd_backlight_helper_get_type which 
simply returns the first matching one of the found backlights of type raw, do 
the following:

Take $PATH as the variable to /sys/class/backlight/foo dir
and check the content of $PATH/../enabled, it has to be "enabled", that way you 
can find out which backlight interface is connected to an LVDS interface that 
actually has a connected LCD.

If no interface is found with:
`cat $PATH/../enabled` == "enabled" then as a fallback, still return the first 
found interface.

I tried to implement this, but just getting the development environment
setup to develop and test took me so much time that I haven't gotten to
it.

Perhaps the above is easy to implement for someone with the proper setup.
Please keep us informed, if I make progress I will post too (but that might 
take a while).
cheers

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[Bug 1683445] Re: E6430 brightness control not working

[Bug Watch Updater]

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

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

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[Bug 1683445] Re: E6430 brightness control not working

[Kai-Heng Feng]

** Bug watch added: freedesktop.org Bugzilla #100922
   https://bugs.freedesktop.org/show_bug.cgi?id=100922

** Also affects: linux via
   https://bugs.freedesktop.org/show_bug.cgi?id=100922
   Importance: Unknown
   Status: Unknown

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[Bug 1683445] Re: E6430 brightness control not working

[Kai-Heng Feng]

nvidia_backlight.c thinks the graphics chip is connected to LVDS, hence
create a backlight interface, 'nv_backlight'.

This can be somehow 'workaround' in userspace tool, but I think it's not
the best way to do it - the backlight interface shouldn't be there if
it's not working at all.

I'll file an upstream bug to ask DRM maintainers how to handle this kind
of situation.

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[Bug 1683445] Re: E6430 brightness control not working

[Po-Hsu Lin]

Verified with Kubuntu / Gnome Ubuntu 17.04 LiveUSB, brightness
adjustment still not working on them.

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[Bug 1683445] Re: E6430 brightness control not working

[Po-Hsu Lin]

The brightness hotkey will change the "brightness" level from
/sys/class/backlight/nv_backlight/, but it seems that it's actually
using the Intel one.

Modify the "brightness" file in /sys/class/backlight/intel_backlight/
can change the screen brightness.

Tested with 4.11rc7

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[Bug 1683445] Re: E6430 brightness control not working

[Po-Hsu Lin]

This issue can be reproduced on another E6430 here, with the same A18
BIOS / 4.10.0-19 kernel. (But the interesting thing is that it cannot be
reproduced with its variant, E6430ATG, even if they're all I+N config,
and using the same BIOS)

Some debug info with the 4.11rc7 mainline kernel
kernel@kernel-Latitude-E6430:~$ ls /sys/class/backlight/
intel_backlight  nv_backlight
kernel@kernel-Latitude-E6430:~$ uname -a
Linux kernel-Latitude-E6430 4.11.0-041100rc7-generic #201704161731 SMP Sun Apr 
16 21:32:58 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux


** Tags added: 201201-10372

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[Bug 1683445] Re: E6430 brightness control not working

[Vincent Gerris]

Hi Joseph,

Thank you for the quick response.
I tested this with the intel-drm-next kernel and the one you suggested and get 
the exact same behavior. It seems like a regression, because this was not 
needed on 16.04/16.10.

I marked it as confirmed and added the tag, thanks you.


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

** Tags added: kernel-bug-exists-upstream

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[Bug 1683445] Re: E6430 brightness control not working

[Joseph Salisbury]

Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.11 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'.

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/v4.11-rc7


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

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

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[Bug 1683445] Re: E6430 brightness control not working

[Vincent Gerris]

So as a wokraround:

sudo vim /etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

sudo update-grub

reboot

This option adds the dell_backlight:
ubuntu@ubuntu-Latitude-E6430:~$ ls /sys/class/backlight
dell_backlight  intel_backlight  nv_backlight

Note that sending events to the intel_backlight like so:
root@ubuntu-Latitude-E6430:~# echo 1000 > 
/sys/class/backlight/intel_backlight/brightness 
works too.

More info regarding backlight troubleshooting:
http://hansdegoede.livejournal.com/13889.html

I guess we need a kernel patch/quirk.

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