Christopher, I ran the command and this was the output
http://paste.ubuntu.com/6505598/
I dont know how to fix that
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Title:
git clone
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git cd
linux git checkout 9efa5e50598c5568b0678bb411b239a0b6e9a328 cp
/boot/config-`uname -r` .config yes '' | make oldconfig make clean
make -j `getconf _NPROCESSORS_ONLN` deb-pkg LOCALVERSION=-custom
cd .. sudo dpkg
uname -a
Linux danato-Lenovo-G780 3.12.0-rc4-custom #1 SMP Mon Dec 2 04:30:15 CST 2013
x86_64 x86_64 x86_64 GNU/Linux
The backlight ddnt work on that custom either, as you predicted
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Danato, ok now delete the .deb files made earlier and execute the following,
which should work if it's the fix commit:
cd linux git checkout 2c62333a408f5badd2d2ffd7177f95deeccc5ca4 cp
/boot/config-`uname -r` .config yes '' | make oldconfig make clean
make -j `getconf _NPROCESSORS_ONLN`
uname -a
Linux danato-Lenovo-G780 3.12.0-rc4-custom #2 SMP Mon Dec 2 09:39:52 CST 2013
x86_64 x86_64 x86_64 GNU/Linux
Yup, this one works
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** Tags added: reverse-bisect-done
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Title:
[Lenovo G780] Backlight switched off at login screen
Status in “linux” package in
Danato, I'm going to marked this Triaged given we have identified the
upstream fix commit, the commit is in mainline stable, and would be
backported to Trusty.
** Changed in: linux (Ubuntu)
Status: Incomplete = Triaged
** Changed in: linux (Ubuntu)
Importance: Medium = Low
**
I hope this report wasnt completely in vain, but I reported before it was
fixed, so I wouldn't know anyways.
Thanks for your time Christopher, at least I learnt a few things doing this
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Danato, could you please test the latest mainline kernel via
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13-rc2-trusty/ and
advise on the results?
** Tags removed: bios-outdated-5ecn96ww
** Tags added: bios-outdated-9.01
** Tags removed: bios-outdated-9.01
** Tags added: latest-bios-9.01
Christopher, that kernel solved the problem. The backlight was working fine on
a boot up.
But I'll wait for a stable release before I move to a new kernel.
Thanks for you advices
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Danato, could you please confirm this issue exists with the latest
development release of Ubuntu? ISO images are available from
http://cdimage.ubuntu.com/daily-live/current/ . If the issue remains,
could you please just make a comment to this.
** Tags added: kernel-fixed-upstream-v3.13-rc2
--
lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:Ubuntu Trusty Tahr (development branch)
Release:14.04
Codename: trusty
Yes, I still have the same issue with this release
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uname -a
Linux danato-Lenovo-G780 3.13.0-031300rc1-generic #201311221535 SMP Fri
Nov 22 20:36:51 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
it also fixes the issue, I booted up with the maximum brightness
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Danato, could you please test http://kernel.ubuntu.com/~kernel-
ppa/mainline/v3.12.2-trusty/ and advise on if this fixes the issue?
** Tags removed: kernel-fixed-upstream-v3.13-rc2 regression-potential
** Tags added: kernel-fixed-upstream-v3.13-rc1
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uname -a
Linux danato-Lenovo-G780 3.12.2-031202-generic #201311291538 SMP Fri Nov
29 20:39:07 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
Boot up backlight working here too
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Danato, could you please test http://kernel.ubuntu.com/~kernel-
ppa/mainline/v3.12.1-trusty/ and advise to the results?
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Title:
I already knew that was coming so I started in advance
uname -a
Linux danato-Lenovo-G780 3.12.1-031201-generic #201311201654 SMP Wed Nov
20 21:54:49 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
The backlight didnt work on boot up here
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Danato, your reverse mainline kernel version testing was quite helpful in
finding potential commits that fixed this problem. One that stands out is:
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?h=linux-3.12.yid=76641adddc5dc634cb7759dfa95d3d5a545678d1
I'm
** Tags added: cherry-pick
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Title:
[Lenovo G780] Backlight switched off at login screen
Status in “linux” package in Ubuntu:
Danato, ok so in order to verify the previously mentioned commit is indeed the
fix, please execute the following in a terminal:
git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
cd linux git checkout commit 9efa5e50598c5568b0678bb411b239a0b6e9a328 cp
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