** Changed in: linux-lts-trusty (Ubuntu)
Status: Confirmed => Won't Fix
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https://bugs.launchpad.net/bugs/1353307
Title:
[Lenovo B470e] Unable to control brightness on 12.04.5
To
** Changed in: hwe-next
Status: Triaged => Won't Fix
** Changed in: hwe-next
Assignee: AceLan Kao (acelankao) => (unassigned)
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https://bugs.launchpad.net/bugs/1353307
Title:
Can't find Edward's patch in comment #9 in upstream, perhaps upstream
has not accepted it. We need someone to follow it up.
** Changed in: linux-lts-trusty (Ubuntu)
Assignee: Edward Lin (airken) => AceLan Kao (acelankao)
** Changed in: linux-lts-trusty (Ubuntu)
Status: In Progress =>
** Changed in: linux-lts-trusty (Ubuntu)
Importance: Undecided => Medium
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Title:
[Lenovo B470e] Unable to control brightness on 12.04.5
To ma
The brightness control only works with intel_backlight.
Blacklist this machine for unregistering ACPI video driver and not using vendor
backlight driver.
https://www.mail-archive.com/platform-
driver-...@vger.kernel.org/msg05397.html
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Similar bug
https://bugzilla.kernel.org/show_bug.cgi?id=50551
** Changed in: linux-lts-trusty (Ubuntu)
Status: New => In Progress
** Bug watch added: Linux Kernel Bug Tracker #50551
http://bugzilla.kernel.org/show_bug.cgi?id=50551
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Test with "video.use_native_backlight=1", "acpi_osi='!Windows 2012'",
"acpi_backlight=vendor".
None of those parameters makes backlight work.
After bisecting, the regression happens on 3.10-rc1.
Before 3.10-rc1, only "intel_backlight" is registered under
/sys/class/backlight/
and acpi/video.c s
both parameters can't make backlight function work.
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https://bugs.launchpad.net/bugs/1353307
Title:
[Lenovo B470e] Unable to control brightness on 12.04.5
To manage notifications about
** Tags added: regression-release
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Title:
[Lenovo B470e] Unable to control brightness on 12.04.5
To manage notifications about this bug go to:
h
@Po-Hsu Lin
Can you try the kernel parameter mentioned in bug 1354313 #3
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https://bugs.launchpad.net/bugs/1353307
Title:
[Lenovo B470e] Unable to control brightness on 12.04.5
To mana
** Changed in: hwe-next
Assignee: (unassigned) => Edward Lin (airken)
** Changed in: linux-lts-trusty (Ubuntu)
Assignee: Anthony Wong (anthonywong) => Edward Lin (airken)
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https
** Also affects: hwe-next
Importance: Undecided
Status: New
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Title:
[Lenovo B470e] Unable to control brightness on 12.04.5
To manage n
** Attachment added: "fwts-method.log"
https://bugs.launchpad.net/ubuntu/+source/linux-lts-trusty/+bug/1353307/+attachment/4170903/+files/fwts-method.log
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** Attachment added: "lspci.log"
https://bugs.launchpad.net/ubuntu/+source/linux-lts-trusty/+bug/1353307/+attachment/4170901/+files/lspci.log
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ubuntu@201208-11587:~$ cat /proc/version
Linux version 3.13.0-32-generic (buildd@phianna) (gcc version 4.6.3
(Ubuntu/Linaro 4.6.3-1ubuntu5) ) #57~precise1-Ubuntu SMP Tue Jul 15 03:51:20
UTC 2014
** Attachment added: "dmidecode.log"
https://bugs.launchpad.net/ubuntu/+source/linux-lts-trusty/
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