adam, the issue you are reporting is an upstream one. Could you please
report this problem following the instructions verbatim at
https://wiki.ubuntu.com/Bugs/Upstream/kernel to the appropriate venue
(TO Zhang Rui CC linux-acpi)?
Please provide a direct URL to your newly made report when it become
** Tags removed: regression-release
** Tags added: trusty
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Title:
Cannot change backlight on my laptop
Status in linux package in U
I do not have an exact copy of my grub before update, I think I had some
flags as a fix maybe year or 1.5y before but probably not acpi_osi= as I
would not see any difference or problem later.
I just tried fresh latest LTS 14.04.3 from usb and it doesn't work with
default settings.
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adam, to clarify the Bug Description, were you able to change the
backlight by default (i.e. no WORKAROUNDs) prior to upgrading?
** Tags removed: kernel-bug-exists-upstream-4.3
** Tags added: kernel-bug-exists-upstream-4.4-rc2
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I've got drm-intel-nightly from 2015-11-25 compiled and tested on this laptop
(due to a bug with cycle-dependency in LNET, you need to disable LNET and
LUSTRE modules, than comment CLEAN in Makefile that has deb-pkg target,
otherwise just follow instructions for
https://wiki.ubuntu.com/Kernel/M
adam, could you please test drm-intel-nightly and advise to the results?
** Tags removed: kernel-bug-exists-upstream-4.3.0-040300-generic
** Tags added: kernel-bug-exists-upstream-4.3
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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Let me know if you need any additional data/info from my side.
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Title:
Cannot change backlight on my laptop
Status in linux package
Mainline kernel doesn't fix this issue - tested with the same boot flags, only
acpi_osi= is bringing backlight control back.
Tested with 4.3.0-040300-generic #201511020949
** Tags added: kernel-bug-exists-upstream
kernel-bug-exists-upstream-4.3.0-040300-generic
** Changed in: linux (Ubuntu)
adam, thank you for reporting this and helping make Ubuntu better.
Could you please undo your WORKAROUND and test the latest upstream
kernel available from the very top line at the top of the page from
http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D (the release
names are irrelevant for tes
Just to follow up - now the backlight is also keeping its level between
reboots.
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Title:
Cannot change backlight on my laptop
Statu
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => arun (arungpurohit)
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Title:
Cannot change backlight on my laptop
Statu
Reboot with just kernel parameter video.use_bios_initial_backlight=0
- still cannot change the backlight with hotkeys nor brightness applet.
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Reboot with just kernel parameter acpi_osi=
- backlight works!!!
I am in heaven with my linux again :)
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Title:
Cannot change backli
No change when using kernel parameter acpi_backlight=vendor
vendorbacklight:
intel_backlight
No change in brightness for
echo 8 > /sys/class/backlight/intel_backlight/brightness
** Attachment added: "lslabacklight"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1516320/+attachment/45
** Attachment added: "dsdt.dsl"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1516320/+attachment/4519207/+files/dsdt.dsl
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** Attachment added: "dmidecode.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1516320/+attachment/4519205/+files/dmidecode.log
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** Attachment added: "ssdt2.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1516320/+attachment/4519212/+files/ssdt2.dat
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** Attachment added: "results.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1516320/+attachment/4519210/+files/results.log
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** Attachment added: "ssdt4.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1516320/+attachment/4519214/+files/ssdt4.dat
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** Attachment added: "fwts_method"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1516320/+attachment/4519209/+files/fwts_method
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** Attachment added: "ssdt3.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1516320/+attachment/4519213/+files/ssdt3.dat
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** Attachment added: "dsdt.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1516320/+attachment/4519206/+files/dsdt.dat
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** Attachment added: "fwts"
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Title:
** Attachment added: "backlight"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1516320/+attachment/4519204/+files/backlight
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** Attachment added: "ssdt5.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1516320/+attachment/4519215/+files/ssdt5.dat
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** Attachment added: "ssdt1.dat"
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** Attachment added: "ssdt6.dat"
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