This bug also affected my PC. You can find my report and attachment
here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1261853
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Title:
[
Nicolas Devillers, 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#KernelTeam.2BAC8-KernelTeamBugPolicies.Overview_on_Reporting_Bugs_Upstream
I think this whole topic from lkml.org is related and describing the
issue: https://lkml.org/lkml/2013/6/9/161
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Title:
[Dell Inspiron 15R 5521]
Bug tested and confirmed on 3.12.0-031200rc3-generic.
Nb: please note the previous mentioned bug is slightly linked to this
one.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Tags removed: needs-upstream-testing
** Tags added: kernel-bug-exists-upstream
** Tags added:
Nicolas Devillers, please do not solicit non-original reporter comments
about a different bug report. This bug is focused solely on "[Dell
Inspiron 15R 5521] Can't toggle backlight brightness".
Hence, could you please test the latest upstream kernel available following
https://wiki.ubuntu.com/Ker
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Title:
[Dell Inspiron 15R 5521] Can't toggle backlight brightness
To manag
@Everthon: I'm sorry to be a bit offtopic but do you have this issue as
well: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1214287 ?
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Title
The adding of acpi_backlight=vendor into grub boot option FIXED the
problem in my Dell Inspiron 15R. I'm using the 3.11.0-9-generic 64 bits
kernel.
Without the proposed fix, the only way I have found to turn brightness
to MAX was setting the config below as ROOT:
echo 4882
Could you please test the latest mainline kernel via
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-rc1-saucy/ and
advise on the results?
** Tags added: needs-upstream-testing raring regression-potential
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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This bug is linked to the previous:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1214287
Latest saucy kernel have been tested and the issue have been confirmed
on them.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
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Title:
[Dell Inspiron 15R 5521] Can't toggle backlight brightness
To manage no
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