This still happens in a fresh install of 19.10 with discrete-only
graphics (Nvidia enabled, Intel disabled in BIOS) and with the nvidia
driver.
Backlight control works when booting with the 19.10 live iso which the
uses nouveau driver.
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Does this still happen on an up-to-date system?
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Title:
Can not control brightness on Thinkpad P51
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I can reproduce this bug on my ThinkPad p51, this is a new bug in 18.10.
Any progress?
** Changed in: linux (Ubuntu)
Status: Expired => New
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I did some testing: deactivated the dedicated graphics in the bios,
booted to ubuntu 18.04 and 18.10 (installed parallel) and both worked.
Though with the dedicated graphics enabled (nvidia) the brightness does
not work...
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B
[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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T
ping Michael and Urschl
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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Title:
Can not control brightness on Thinkpad P51
Not familiar with Thinkpad laptops, does it only show backlight sysfs
with thinkpad-acpi.brightness_enable=1?
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Title:
Can not control brightness
The directory `/sys/class/backlight` is empty.
However, on my 16.04.3 system -- where the backlight works just fine --
this directory is also empty.
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Does change the value of /sys/class/backlight/thinkpad_screen/brightness
change the brightness?
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Title:
Can not control brightness on Thinkpad P5
> Did this issue start happening after an update/upgrade? Was there a
prior kernel version where you were not having this particular problem?
I can not say if brightness controls worked immediately after installing
the system. However, they were definitely broken after installing a few
standard pa
Did this issue start happening after an update/upgrade? Was there a
prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.15 kernel[
This bug also affects me
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Title:
Can not control brightness on Thinkpad P51
To manage notifications about this bug go to:
https://bugs.launchpad
apport information
** Tags added: apport-collected
** Description changed:
I can not modify the screen brightness in Ubuntu 17.10. Controls aside,
the classes in `proc` are either not available or non-functional
depending on what arguments I provide in GRUB_CMDLINE_LINUX_DEFAULT.
On a
** Package changed: ubuntu => linux (Ubuntu)
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Title:
Can not control brightness on Thinkpad P51
To manage notifications about this bug go to:
ht
Thank you for taking the time to report this bug and helping to make
Ubuntu better. It seems that your bug report is not filed about a
specific source package though, rather it is just filed against Ubuntu
in general. It is important that bug reports be filed about source
packages so that people
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