*** This bug is a duplicate of bug 1304644 ***
https://bugs.launchpad.net/bugs/1304644
** This bug has been marked a duplicate of bug 1304644
8086:0166 [Dell Inspiron 15R 5521] Impossible to adjust the screen backlight
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Federico Leoni, thank you for your comment. So your hardware and problem may be
tracked, could you please file a new report with Ubuntu by executing the
following in a terminal while booted into a Ubuntu repository kernel (not a
mainline one) via:
ubuntu-bug linux
For more on this, please read
Christopher,
thanks for your reply. I'll open the new bug ASAP.
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Title:
8086:0166 [Dell Inspiron 15R 5521] Impossible to adjust the screen
A customer of mine gave me his old notebook because he bought a new one.
The laptop is running an p to date Xubuntu 13.10 64bit. Now I'm
suffering similar issue with brightness control: when I press the
appropriate keys on keyboard the slide appears on the upper right corner
of the screen but even
The bug persist on Kernel v3.13-trusty
** Tags removed: kernel-bug-exists-upstream-v3.13-rc8
** Tags added: kernel-bug-exists-upstream-v3.13-trusty
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The bug persist on Kernel v3.13-rc8
** Tags removed: kernel-bug-exists-upstream-v3.13-rc7
** Tags added: kernel-bug-exists-upstream-v3.13-rc8
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The bug persist on Kernel v3.13-rc7
** Tags removed: kernel-bug-exists-upstream-v3.13-rc6
** Tags added: kernel-bug-exists-upstream-v3.13-rc7
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The bug persist on Kernel v3.13-rc6
** Tags removed: kernel-bug-exists-upstream-v3.13-rc5
** Tags added: kernel-bug-exists-upstream-v3.13-rc6
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Hi all,
Now that we have identified workarounds ... the bug will be fixed?
Anyway thanks to everyone for the help.
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Title:
8086:0166 [Dell
Hi guys,
adding video.use_native_backlight=1 to kernel cmdline produce the solving of
the problem on Ubuntu kernel v3.13-rc5.
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Title:
8086:0166
but does not work in Ubuntu Kernel v3.11.0-14-generic
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Title:
8086:0166 [Dell Inspiron 15R 5521] Impossible to adjust the screen
backlight
To
** Description changed:
the change in the level of illumination of the screen, through the
corresponding option in the control panel, has no effect.
- WORKAROUND: Works only with Ubuntu kernel version 3.11.0-14-generic, as in
the v.3.13-rc3 produces black screen:
+ Upstream post:
The use_native_backlight cmdline option is added to v3.13 kernel so it
will not work on v3.11 kernel.
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Title:
8086:0166 [Dell Inspiron 15R 5521]
Hi Christopher,
a maintainer of the Linux kernel has written this
Does this patch help?
http://www.spinics.net/lists/linux-acpi/msg47755.html
what should i do
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** Description changed:
the change in the level of illumination of the screen, through the
corresponding option in the control panel, has no effect.
WORKAROUND: Works only with Ubuntu kernel version 3.11.0-14-generic, as in
the v.3.13-rc3 produces black screen:
acpi_backlight=vendor
+
update:
I tried the v3.13-rc5 kernel from the mainline.
Without the workaround acpi_backlight=vendor the adjusting of backlight does
not work.
In the other hand, the application of workaround at the v3.13-rc5 kernel
produces blackscreen at startup of the OS.
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the only version where the workaround works remains the
3.11.0-14-generic (Ubuntu stable kernel)
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Title:
8086:0166 [Dell Inspiron 15R 5521]
** Tags removed: kernel-bug-exists-upstream-v3.13-rc3
** Tags added: kernel-bug-exists-upstream-v3.13-rc5
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Title:
8086:0166 [Dell Inspiron 15R
Alex Barattini, thank you for advising on the potential fix commit. Regarding
it http://www.spinics.net/lists/linux-acpi/msg47755.html , in order to test
this patch, start by copying from the line where it notes:
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
to the last code line
If testing a patch is not convenient, then use the cmdline option is the same
regarding the above patch.
With the latest upstream kernel, add video.use_native_backlight=1 to kernel
cmdline and see what happens.
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Bugs,
I sent the email to linux-a...@vger.kernel.org as suggested.
I also point out that the workaround works only with the Ubuntu stable kernel
version (3.11.0-14-generic). In the v.3.13-rc3 produces black screen.
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** Description changed:
the change in the level of illumination of the screen, through the
corresponding option in the control panel, has no effect.
- WORKAROUND: acpi_backlight=vendor
+ WORKAROUND: Works only with Ubuntu kernel version 3.11.0-14-generic, as in
the v.3.13-rc3 produces
Sorry but i'm not an expert user.
which of these .deb should I download and install?
** Attachment added: Schermata del 2013-12-18 11:59:46.png
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1261853/+attachment/3931812/+files/Schermata%20del%202013-12-18%2011%3A59%3A46.png
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Alex Barattini, please see https://wiki.ubuntu.com/Kernel/MainlineBuilds
.
** Attachment removed: Schermata del 2013-12-18 11:59:46.png
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1261853/+attachment/3931812/+files/Schermata%20del%202013-12-18%2011%3A59%3A46.png
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Alex Barattini, thank you for performing the requested test. Would either of
the following kernel parameters used separately provide a WORKAROUND:
acpi_backlight=vendor
video.use_bios_initial_backlight=0
or the following in combination:
thinkpad-acpi.brightness_enable=1 acpi_backlight=vendor
**
** Tags removed: needs-upstream-testing
** Tags added: kernel-bug-exists-upstream
** Tags removed: kernel-bug-exists-upstream
** Tags added:
kernel-bug-exists-upstreamkernel-bug-exists-upstream-v3.13-rc3-trusty
** Tags removed:
ok, bug confirmed on last upstream kernel.
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Title:
8086:0166 [Dell Inspiron 15R 5521] Impossible to adjust the screen
backlight
To manage
with the following workaround the problem is solved
acpi_backlight=vendor
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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Alex Barattini, thank you for performing the requested tests. Hence,
this is an upstream bug. Could you please report this through the
appropriate channel (would start with linux-acpi) by following the
instructions _verbatim_ via
Alex Barattini, thank you for updating your BIOS. Could you please test the
latest upstream kernel available (v3.13-rc3, as rc4 doesn't have all the files
yet) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow
additional upstream developers to examine the issue. Once you've
alex@alex-Inspiron-5521:~$ sudo dmidecode -s bios-version sudo dmidecode -s
bios-release-date
[sudo] password for alex:
A12
10/25/2013
I updated the BIOS to version suggested but did not produce any change.
It remains impossible to adjust the screen brightness
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I tested from live-usb the daily .iso of Ubuntu. The problem persist. I attach
the report generated by the command apport-cli - save bug.log linux.
Now I go to try the live-usb .iso version 12.04.03
** Attachment added: bug.log
** Tags removed: staging
** Tags added: kernel-bug-exists-upstream-3.12.0-7-generic
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
** Tags added: kernel-bug-exists-upstream staging
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Alex Barattini, the latest mainline kernel is http://kernel.ubuntu.com
/~kernel-ppa/mainline/v3.13-rc3-trusty/ . Could you please test this and
report the results?
** Tags removed: staging
** Tags added: needs-upstream-testing
** Tags removed: kernel-bug-exists-upstream kernel-bug-exists-
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