** Tags added: cscc
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Title:
Backlight control does not work and there are no entries in
/sys/class/backlight
Status in linux pack
** Changed in: linux (Ubuntu)
Status: In Progress => Fix Released
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Title:
Backlight control does not work and there are no en
This bug was fixed in the package linux - 4.4.0-78.99
---
linux (4.4.0-78.99) xenial; urgency=low
* linux: 4.4.0-78.99 -proposed tracker (LP: #1686645)
* Please backport fix to reference leak in cgroup blkio throttle
(LP: #1683976)
- block: fix module reference leak on pu
Please don't drop the fix from the source code!
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Title:
Backlight control does not work and there are no entries in
/sys/class/bac
The kernel in -proposed (4.4.0.78) works.
** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial
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Title:
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
xenial' to 'verification-done-xenial'. If the problem still exists,
change the tag 'verifica
** Changed in: linux (Ubuntu Xenial)
Status: In Progress => Fix Committed
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Title:
Backlight control does not work and there a
This build is good!
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Title:
Backlight control does not work and there are no entries in
/sys/class/backlight
Status in linux pack
The bisect reported the following commit as the first bad commit:
commit 69e236e70ead32e8cc2b84ce075dbe1319ca166b(Mainline commit 6276e53fa8c0)
Author: Hans de Goede
Date: Tue Nov 29 15:32:16 2016 +0100
ACPI / video: Add force_native quirk for HP Pavilion dv6
This commit was already rever
This build is bad.
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Title:
Backlight control does not work and there are no entries in
/sys/class/backlight
Status in linux packa
I built the next test kernel up to the commit:
69e236e70ead32e8cc2b84ce075dbe1319ca166b
This test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1667323/
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
This kernel is good.
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Title:
Backlight control does not work and there are no entries in
/sys/class/backlight
Status in linux pac
I built the next test kernel up to the commit:
2c2375e40d28b3d0fd961448fd12963f66b4b452
This test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1667323/
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
This kernel is good.
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Title:
Backlight control does not work and there are no entries in
/sys/class/backlight
Status in linux pac
I built the next test kernel up to the commit:
5283a7bedbcbdfa654c8a4d7fb314d734a56e544
This test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1667323/
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
This kernel is good!
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Title:
Backlight control does not work and there are no entries in
/sys/class/backlight
Status in linux pac
I built the next test kernel up to the commit:
e01b04be3eb00456d65278cfa56cfd8103872bfbq
This test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1667323/
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
This kernel is bad too.
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Title:
Backlight control does not work and there are no entries in
/sys/class/backlight
Status in linux
I built the next test kernel up to the commit:
a163451c80b028d97b5224c74517dbf67ac45f2c
This test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1667323/
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
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)
** Changed in: linux (Ubuntu Xenial)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)
** Changed in: linux (Ubuntu Xenial)
Status: Triaged => In Progress
** Changed in: linux (Ubuntu)
Thank you for taking the time to help with this bug Joseph!
This build (/~jsalisbury/lp1667323) is bad.
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Title:
Backlight control d
I started a bisect between 4.4.40 an 4.4.41. This will require testing
about 7 - 10 test kernels. I built the first test kernel up to the
commit:
1cc0f9488b913a798a53eb7e4a73211c4d64a24c
This test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1667323/
Can you test that
Of course!
4.4.57 is bad
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Title:
Backlight control does not work and there are no entries in
/sys/class/backlight
Status in linu
Thanks for the update. Before I start the bisect between 4.4.40 and
4.4.41, can you test the 4.4.57 kernel? It is available from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.57
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Unfortunately you are right. 4.4 final is good.
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Title:
Backlight control does not work and there are no entries in
/sys/class/bac
And can you ensure 4.4 final is bad? It is available from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-wily/
If 4.4 final is bad, I can reverse bisect between 4.4 and 4.5-rc1.
However, if 4.4 final is good(Which it probably will be), we will have
to go back to performing a standard bisect
4.5-rc1 good
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Title:
Backlight control does not work and there are no entries in
/sys/class/backlight
Status in linux package in
Can you give the 4.5-rc1 kernel a try:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.5-rc1-wily/
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Title:
Backlight control does n
4.9 good
4.7 good
4.5 good
4.4.55 bad (from http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.55/)
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Title:
Backlight control does n
It is probably best to perform a "Reverse" bisect instead of a standard
bisect, since we know this bug is fixed in 4.10 final.
A "Reverse" bisect will identify the commit that fixes the bug instead
of identifying the commit that introduced the bug. We just need to do
the oppisite of a standard bi
The first kernel to has this bug is 4.4.41.
I ended up testing all of them, so:
4.4.40 good
4.4.41 bad
4.4.42 bad
4.4.43 bad
4.4.44 bad
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Can you test the following kernels to see when this bug was introduced
upstream:
4.4.41: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.40/
4.4.41: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.41/
4.4.42: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.42/
4.4.43: http://kernel.ubuntu
Kernel 4.4.0-63 is bad.
Details:
I reach
https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/ppa/+build/11016267
It does not contains kernel 4.4.0-63 but instead 4.4.0-43.63. Besides
that, I proceed and installed:
linux-headers-4.4.0-43_4.4.0-43.63_all.deb
linux-headers-4.4.0-43-gen
Thanks for testing. I can perform a bisect to identify the commit that
introduced the regression. We first need to know the last good kernel
and the first bad kernel version. We know the 4.4.0-62 is good and
4.4.0-64 is bad. Can you test the 4.4.0-63 kernel, which can be
downloaded from:
https
The bug happens with the latest 4.4 upstream stable kernel.
How I tested:
I reach:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.53
and downloaded:
linux-headers-4.4.53-040453_4.4.53-040453.201703120131_all.deb
linux-image-4.4.53-040453-generic_4.4.53-040453.201703120131_amd64.deb
linux-
Can you see if this bug happens with the latest 4.4 upstream stable kernel:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.53
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Tit
The bug is still present with the kernel linux-image-4.4.0-66-generic.
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Title:
Backlight control does not work and there are no entr
Can I help with the bisect?
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Title:
Backlight control does not work and there are no entries in
/sys/class/backlight
Status in li
Can I help with the bisect?
On Mar 3, 2017 18:11, "Joseph Salisbury"
wrote:
** Tags added: needs-bisect
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Title:
Backlight control does not work and there are no entries
** Tags added: needs-bisect
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Title:
Backlight control does not work and there are no entries in
/sys/class/backlight
Status in li
The bug is still present with the kernel linux-image-4.4.0-65-generic.
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Title:
Backlight control does not work and there are no entr
Upstream kernel v4.10 works.
** Tags added: kernel-fixed-upstream
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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So the bug happens in -64 but not -62?
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.10 kernel[0].
If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream
I tried to boot to linux-image-4.4.0-62-generic but I could not get past
the login screen. So I reinstalled the linux-image-4.4.0-62-generic and
run update-grub. Then I could boot to it (linux-image-4.4.0-62-generic)
and the brightness is working again. I think it is a kernel regression.
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Neither:
GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi="
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Title:
Backlight control does not work and there are no entries in
/sys/class/ba
Neither:
GRUB_CMDLINE_LINUX_DEFAULT="video.use_bios_initial_backlight=0"
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Title:
Backlight control does not work and there are no e
Changing the grub line
GRUB_CMDLINE_LINUX_DEFAULT=""
to
GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=vendor"
did not work.
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** Attachment added: "ssdt2.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1667323/+attachment/4825242/+files/ssdt2.dat
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** Attachment added: "ssdt1.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1667323/+attachment/4825241/+files/ssdt1.dat
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** Attachment added: "sudo dmidecode > dmidecode.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1667323/+attachment/4825249/+files/dmidecode.log
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** Attachment added: "grep -r . /proc/acpi > acpi"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1667323/+attachment/4825239/+files/acpi
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** Attachment added: "acpixtract acpidump.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1667323/+attachment/4825240/+files/acpidump.txt
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** Attachment added: "ssdt3.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1667323/+attachment/4825243/+files/ssdt3.dat
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** Attachment added: "ssdt4.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1667323/+attachment/4825244/+files/ssdt4.dat
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** Attachment added: "dsdt.dsl"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1667323/+attachment/4825246/+files/dsdt.dsl
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** Attachment added: "sudo fwts > fwts"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1667323/+attachment/4825247/+files/fwts
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** Attachment added: "ssdt5.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1667323/+attachment/4825245/+files/ssdt5.dat
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** Attachment added: "sudo fwts method > fwts_method"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1667323/+attachment/4825248/+files/fwts_method
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