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Message #06956
[Bug 677274] Re: Brightness control on Lenovo Ideapad u450p behaves non-monotonically
Andreas Gölzer, this bug was reported a while ago and there hasn't been
any activity in it recently. We were wondering if this is still an
issue? If so, could you please test for this with the latest development
release of Ubuntu? ISO images are available from
http://cdimage.ubuntu.com/daily-live/current/ .
If it remains an issue, could you please run the following command in
the development release from a Terminal
(Applications->Accessories->Terminal), as it will automatically gather
and attach updated debug information to this report:
apport-collect -p linux <replace-with-bug-number>
Also, could you please test the latest upstream kernel available following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Please do not test the daily folder, but the one all the way at the bottom. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER
where VERSION-NUMBER is the version number of the kernel you tested. For example:
kernel-fixed-upstream-v3.11-rc5
This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag:
needs-upstream-testing
If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER
As well, please remove the tag:
needs-upstream-testing
If you are unable to test the mainline kernel, please comment as to why specifically you were unable to test it and add the following tags:
kernel-unable-to-test-upstream
kernel-unable-to-test-upstream-VERSION-NUMBER
Once testing of the upstream kernel is complete, please mark this bug's
Status as Confirmed. Please let us know your results. Thank you for your
understanding.
** Description changed:
- Using a Lenovo Ideapad u450p and Ubuntu Maverick(10.10), controlling the
- display brightness does work rather unexpectedly.
+ Expected: Keyboard keys change the brightness, where fn+down should decrease it, and fn+up should increase it. Maybe a nice applet showing what brightness is set.
+ But, observed: The brightness alternates between very bright and very low. The applet shows up(in kde). To check whether this was a kde issue i used the command line, where the behavior is similar.
- Expected: Keyboard keys change the brightness, where fn+down should decrease it, and fn+up should increase it. Maybe a nice applet showing what brightness is set.
- But, observed: The brightness alternates between very bright and very low. The applet shows up(in kde).
-
- To check whether this was a kde issue i used the command line, where the
- behavior is similar.
-
- root@rawls:/proc/acpi/video/VGA/LCD# cat brightness
+ root@rawls:/proc/acpi/video/VGA/LCD# cat brightness
levels: 0 10 20 30 40 50 60 70 80 90 100
current: 50
- and setting works with for example
+ and setting works with for example
echo 70 > brightness
which results in
80: pretty dark
0,20,40,60,100: slightly brighter, but still rather dark
10,30,50,70,90: pretty bright
which is not what one would,at least naively, expect.
I tried some settings like 91, giving
-bash: echo: write error: Invalid argument
- possibly related bugs might be
- - https://bugs.launchpad.net/ubuntu/+source/linux/+bug/571421 "brightness hotkeys not functional on Lenovo Ideapad u450p", though the keys work fine for me
- - https://bugs.launchpad.net/linux/+bug/513921 "hotkeys adjust display brightness non-monotonically on new Asus pinetrail netbooks (1001P, 1005P, 1005PE)"
-
I tried the workaround from bug 513921, but after adding acpi_osi=linux
and acpi_backlight=vendor I could not set the display brightness at all
any more.
-
- I hope ubuntu-bug attached the necessary information this is filed in
- the right place.
ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-22-generic 2.6.35-22.35
Regression: No
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-22.35-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
- **** List of CAPTURE Hardware Devices ****
- card 0: Intel [HDA Intel], device 0: ALC272 Analog [ALC272 Analog]
- Subdevices: 1/1
- Subdevice #0: subdevice #0
+ **** List of CAPTURE Hardware Devices ****
+ card 0: Intel [HDA Intel], device 0: ALC272 Analog [ALC272 Analog]
+ Subdevices: 1/1
+ Subdevice #0: subdevice #0
AudioDevicesInUse:
- USER PID ACCESS COMMAND
- /dev/snd/controlC0: goelzera 7763 F.... pulseaudio
+ USER PID ACCESS COMMAND
+ /dev/snd/controlC0: goelzera 7763 F.... pulseaudio
Card0.Amixer.info:
- Card hw:0 'Intel'/'HDA Intel at 0xf0400000 irq 46'
- Mixer name : 'Realtek ALC272'
- Components : 'HDA:10ec0272,17aac006,00100001'
- Controls : 17
- Simple ctrls : 10
+ Card hw:0 'Intel'/'HDA Intel at 0xf0400000 irq 46'
+ Mixer name : 'Realtek ALC272'
+ Components : 'HDA:10ec0272,17aac006,00100001'
+ Controls : 17
+ Simple ctrls : 10
Card1.Amixer.info:
- Card hw:1 'HDMI'/'HDA ATI HDMI at 0xf0210000 irq 47'
- Mixer name : 'ATI R6xx HDMI'
- Components : 'HDA:1002aa01,00aa0100,00100100'
- Controls : 4
- Simple ctrls : 1
+ Card hw:1 'HDMI'/'HDA ATI HDMI at 0xf0210000 irq 47'
+ Mixer name : 'ATI R6xx HDMI'
+ Components : 'HDA:1002aa01,00aa0100,00100100'
+ Controls : 4
+ Simple ctrls : 1
Card1.Amixer.values:
- Simple mixer control 'IEC958',0
- Capabilities: pswitch pswitch-joined penum
- Playback channels: Mono
- Mono: Playback [off]
+ Simple mixer control 'IEC958',0
+ Capabilities: pswitch pswitch-joined penum
+ Playback channels: Mono
+ Mono: Playback [off]
Date: Fri Nov 19 00:52:44 2010
HibernationDevice: RESUME=UUID=7a4abe7d-4147-48d0-8057-b1f964dc963b
InstallationMedia: Kubuntu 10.10 "Maverick Meerkat" - Release Candidate amd64 (20100928.3)
MachineType: LENOVO 3389
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic root=UUID=7965020f-a640-4958-8bea-09eb9aaa31a3 ro
ProcEnviron:
- LANGUAGE=
- PATH=(custom, user)
- LANG=en_US.UTF-8
- SHELL=/bin/bash
+ LANGUAGE=
+ PATH=(custom, user)
+ LANG=en_US.UTF-8
+ SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.38
SourcePackage: linux
WifiSyslog:
-
+
dmi.bios.date: 01/20/2010
dmi.bios.vendor: LENOVO
dmi.bios.version: 22CN35WW(V2.02)
dmi.board.name: NITU1
dmi.board.vendor: LENOVO
dmi.board.version: REFERENCE
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnLENOVO:bvr22CN35WW(V2.02):bd01/20/2010:svnLENOVO:pn3389:pvrLenovoIdeaPadU450p:rvnLENOVO:rnNITU1:rvrREFERENCE:cvnNoEnclosure:ct10:cvrN/A:
dmi.product.name: 3389
dmi.product.version: Lenovo IdeaPad U450p
dmi.sys.vendor: LENOVO
** Tags added: latest-bios22cn35ww
** Tags added: needs-upstream-testing regression-potential
** Tags added: natty
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
--
You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/677274
Title:
Brightness control on Lenovo Ideapad u450p behaves non-monotonically
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
Expected: Keyboard keys change the brightness, where fn+down should decrease it, and fn+up should increase it. Maybe a nice applet showing what brightness is set.
But, observed: The brightness alternates between very bright and very low. The applet shows up(in kde). To check whether this was a kde issue i used the command line, where the behavior is similar.
root@rawls:/proc/acpi/video/VGA/LCD# cat brightness
levels: 0 10 20 30 40 50 60 70 80 90 100
current: 50
and setting works with for example
echo 70 > brightness
which results in
80: pretty dark
0,20,40,60,100: slightly brighter, but still rather dark
10,30,50,70,90: pretty bright
which is not what one would,at least naively, expect.
I tried some settings like 91, giving
-bash: echo: write error: Invalid argument
I tried the workaround from bug 513921, but after adding
acpi_osi=linux and acpi_backlight=vendor I could not set the display
brightness at all any more.
ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-22-generic 2.6.35-22.35
Regression: No
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-22.35-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC272 Analog [ALC272 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: goelzera 7763 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xf0400000 irq 46'
Mixer name : 'Realtek ALC272'
Components : 'HDA:10ec0272,17aac006,00100001'
Controls : 17
Simple ctrls : 10
Card1.Amixer.info:
Card hw:1 'HDMI'/'HDA ATI HDMI at 0xf0210000 irq 47'
Mixer name : 'ATI R6xx HDMI'
Components : 'HDA:1002aa01,00aa0100,00100100'
Controls : 4
Simple ctrls : 1
Card1.Amixer.values:
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [off]
Date: Fri Nov 19 00:52:44 2010
HibernationDevice: RESUME=UUID=7a4abe7d-4147-48d0-8057-b1f964dc963b
InstallationMedia: Kubuntu 10.10 "Maverick Meerkat" - Release Candidate amd64 (20100928.3)
MachineType: LENOVO 3389
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic root=UUID=7965020f-a640-4958-8bea-09eb9aaa31a3 ro
ProcEnviron:
LANGUAGE=
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.38
SourcePackage: linux
WifiSyslog:
dmi.bios.date: 01/20/2010
dmi.bios.vendor: LENOVO
dmi.bios.version: 22CN35WW(V2.02)
dmi.board.name: NITU1
dmi.board.vendor: LENOVO
dmi.board.version: REFERENCE
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnLENOVO:bvr22CN35WW(V2.02):bd01/20/2010:svnLENOVO:pn3389:pvrLenovoIdeaPadU450p:rvnLENOVO:rnNITU1:rvrREFERENCE:cvnNoEnclosure:ct10:cvrN/A:
dmi.product.name: 3389
dmi.product.version: Lenovo IdeaPad U450p
dmi.sys.vendor: LENOVO
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