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[Bug 1516320] Re: Cannot change backlight on my laptop

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: "Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>
Date: Sun, 15 Nov 2015 14:22:56 -0000
Reply-to: Bug 1516320 <1516320@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
adam, thank you for reporting this and helping make Ubuntu better.

Could you please undo your WORKAROUND and test the latest upstream
kernel available from the very top line at the top of the page from
http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D (the release
names are irrelevant for testing, and please do not test the daily
folder)? Install instructions are available at
https://wiki.ubuntu.com/Kernel/MainlineBuilds . This will allow
additional upstream developers to examine the issue.

If the latest kernel did not allow you to test to the issue (ex. you couldn't boot into the OS) please make a comment in your report about this, and continue to test the next most recent kernel version until you can test to the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this issue is fixed in the mainline kernel, please add the following tags by clicking on the yellow circle with a black pencil icon, next to the word Tags, located at the bottom of the report description:
kernel-fixed-upstream
kernel-fixed-upstream-X.Y-rcZ

Where X, and Y are two numbers corresponding to the kernel version, and
Z is one release candidate number if applicable.

If the mainline kernel does not fix the issue, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-X.Y-rcZ

Please note, an error to install the kernel does not fit the criteria of
kernel-bug-exists-upstream.

Once testing of the latest upstream kernel is complete, please mark this
report's Status as Confirmed. Please let us know your results.

Thank you for your understanding.

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

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

** Changed in: linux (Ubuntu)
     Assignee: arun (arungpurohit) => (unassigned)

** Description changed:

  Option stopped working after upgrading to 15.10, full light all time
  (before with some hacking it was working, but still was lacking keeping
- the levels between reboots)
+ the levels between reboots).
+ 
+ WORKAROUND: Add kernel parameter:
+ acpi_osi=
  
  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-18-generic 4.2.0-18.22
  ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
  Uname: Linux 4.2.0-18-generic x86_64
  ApportVersion: 2.19.1-0ubuntu4
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  ab         2051 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  ab         2051 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Sat Nov 14 22:44:57 2015
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=33abcad5-3750-4855-b97b-2d5b0fb864ee
  InstallationDate: Installed on 2013-10-24 (751 days ago)
  InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U4E/540U4E
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-18-generic root=UUID=f467e962-e87d-4a39-a861-79138b4809d1 ro quiet splash resume=/dev/sdb2 vt.handoff=7
  RelatedPackageVersions:
-  linux-restricted-modules-4.2.0-18-generic N/A
-  linux-backports-modules-4.2.0-18-generic  N/A
-  linux-firmware                            1.149.2
+  linux-restricted-modules-4.2.0-18-generic N/A
+  linux-backports-modules-4.2.0-18-generic  N/A
+  linux-firmware                            1.149.2
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/05/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P07ACM.063.130905.dg
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: NP530U4E-K02PL
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: SEC_SW_REVISION_1234567890ABCD
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP07ACM.063.130905.dg:bd09/05/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U4E/540U4E:pvrP07ACM:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP530U4E-K02PL:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
  dmi.product.name: 530U4E/540U4E
  dmi.product.version: P07ACM
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

** Tags added: regression-release

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https://bugs.launchpad.net/bugs/1516320

Title:
  Cannot change backlight on my laptop

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Option stopped working after upgrading to 15.10, full light all time
  (before with some hacking it was working, but still was lacking
  keeping the levels between reboots).

  WORKAROUND: Add kernel parameter:
  acpi_osi=

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-18-generic 4.2.0-18.22
  ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
  Uname: Linux 4.2.0-18-generic x86_64
  ApportVersion: 2.19.1-0ubuntu4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ab         2051 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Sat Nov 14 22:44:57 2015
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=33abcad5-3750-4855-b97b-2d5b0fb864ee
  InstallationDate: Installed on 2013-10-24 (751 days ago)
  InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U4E/540U4E
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-18-generic root=UUID=f467e962-e87d-4a39-a861-79138b4809d1 ro quiet splash resume=/dev/sdb2 vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-18-generic N/A
   linux-backports-modules-4.2.0-18-generic  N/A
   linux-firmware                            1.149.2
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/05/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P07ACM.063.130905.dg
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: NP530U4E-K02PL
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: SEC_SW_REVISION_1234567890ABCD
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP07ACM.063.130905.dg:bd09/05/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U4E/540U4E:pvrP07ACM:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP530U4E-K02PL:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
  dmi.product.name: 530U4E/540U4E
  dmi.product.version: P07ACM
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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References

[Bug 1516320] [NEW] Cannot change backlight on my laptop
From: Adam, 2015-11-14