Before performing the reverse bisect process I thought to ask directly
in the linux-acpi mailing list which was the patch (or the set of
patches) that have fixed the acpi/backlight issue .
This is the answer:
(original message http://marc.info/?l=linux-acpi&m=140429106012604&w=2)
Jeremie Tamburini, Aaron Lu doesn't support the 3.13.x kernel series,
the Ubuntu Kernel Team does. Despite this, the fix commit is still
required as requested in
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1318299/comments/11
.
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Hi Christopher,
in the last couple of days I tried the kernels I didn't try before and now I
can tell for sure that the fix arrived with the v3.16rc1 kernel. I also had a
look at the bisect documentation and tried to move my first steps.
In the meantime Aaron Lu, the guy that was looking after
Jeremie Tamburini, the next step is to fully reverse commit bisect the
kernel in order to identify the fix commit. Could you please do this
following
https://wiki.ubuntu.com/Kernel/KernelBisection#How_do_I_reverse_bisect_the_upstream_kernel.3F
?
** Tags added: needs-reverse-bisect
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Some good news.
I've tried the upstream kernel 3.16-rc2 and the brightness shortcut
"Fn+F6/Fn+F7" is now working out of the box without any workaround.
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** Description changed:
Pressing Fn+F6 or Fn+F7 the brightness doesn't change.
+
+ Upstream URL: http://marc.info/?l=linux-
+ acpi&m=140178030214298&w=2
WORKAROUND: Execute at a terminal:
for i in /sys/class/backlight/*; do echo $i;cat $i/brightness;cat
$i/max_brightness;done
shows
** Attachment added: "acpidump.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1318299/+attachment/4124592/+files/acpidump.txt
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Right, this should be OK http://marc.info/?l=linux-
acpi&m=140178030214298&w=2
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https://bugs.launchpad.net/bugs/1318299
Title:
[Fujitsu Lifebook A512] Brightness hot keys F
Jeremie Tamburini, the e-mail looks good, but you would want to redirect
it to the linux-acpi mailing list, as this is where brightness issues
tend to get addressed.
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@Christopher
Here the bug report on the Linux mailing list:
http://lkml.iu.edu//hypermail/linux/kernel/1406.0/00478.html
hope it's OK.
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https://bugs.launchpad.net/bugs/131829
Jeremie Tamburini, the issue you are reporting is an upstream one. Could
you please report this problem through the appropriate channel by
following the instructions _verbatim_ at
https://wiki.ubuntu.com/Bugs/Upstream/kernel ?
Please provide a direct URL to your e-mail to the mailing list once you
Hi Christopher,
Tried the 3.15-rc7 kernel but the problem is still there. Pressing
Fn+F6/Fn+F7 the brightness doesn't change.
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Title:
** Tags added: kernel-bug-exists-upstream kernel-bug-exists-
upstream-3.15-rc7
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Jeremie Tamburini, thank you for reporting this and helping make Ubuntu better.
Could you please test the latest upstream kernel available (3.15-rc7) following
https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional
upstream developers to examine the issue. Once you've tested the
** Changed in: linux (Ubuntu)
Importance: Undecided => Low
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Title:
[Fujitsu Lifebook A512] Brightness hot keys Fn+F6/Fn+F7 don't
** Tags added: latest-bios-1.16 regression-potential
** Description changed:
- (Fujitsu Lifebook A512 - Ubuntu 14.04 - Linux 3.13.0-24-generic x86_64)
-
Pressing Fn+F6 or Fn+F7 the brightness doesn't change.
- WORKAROUND (found here http://ubuntuforums.org/showthread.php?t=2192471)
-
- 1)
** Description changed:
(Fujitsu Lifebook A512 - Ubuntu 14.04 - Linux 3.13.0-24-generic x86_64)
Pressing Fn+F6 or Fn+F7 the brightness doesn't change.
-
WORKAROUND (found here http://ubuntuforums.org/showthread.php?t=2192471)
1) The command:
for i in /sys/class/backlight/*; do
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