I have Lenovo Legion 5 15ARH05 with Ryzen 5 4600H. I've checked that the issue
is present in Ubuntu 20.10 beta, Fedora 32 with Kernel 5.8, Fedora 33, Manjaro
with latest 5.8 kernel, opensuse tumbleweed.
On manjaro and fedora 32 with any kernel 5.6, and MX Linux backlight can be
changed at
I have Lenovo 15ARH05 with Ryzen 7 4800h and the same problem as in bug
description. In Fedora 32 with kernel 5.6.6-300 backlight control is fine, even
though actual_brightness changes from 514 to 65536. But there is another bug in
this kernel, so I updated to 5.8.4-200 and backlight control
It's merged in v5.9-rc3, so please test latest mainline kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.9-rc3/amd64/
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Oh, is there a way to try out that patch? if yes how?
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Title:
BrightnessOutofRange: Actual brightness for amdgpu_bl0 not in range
This commit should fix it:
https://cgit.freedesktop.org/~agd5f/linux/commit/?h=amd-staging-drm-next=da4bc9b2857e27c45614872e180ef8702556ff28
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Hello,
I'm using Pop OS, and I have also the same issue like here it was described.
marton@pop-os:/sys/class/backlight/amdgpu_bl0$ cat actual_brightness
60944
marton@pop-os:/sys/class/backlight/amdgpu_bl0$ cat brightness
255
marton@pop-os:/sys/class/backlight/amdgpu_bl0$ cat max_brightness
255
@esanya,
Thanks for updating the results. Hopefully the HW failure is the root
cause of the brightness problem that acer can fix.
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Thank You for your support, I have tried the 5.7.rc1, but without
success.
Then I have sent the laptop back to ACER, they have found a HW
Failure...
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Kernel 5.7rc1 is released, and it can be downloaded @
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.7-rc1/
There are some changes related to amd backlight from 5.6 to 5.7rc1 such
as the following (list may be not completed), and it surely worthwhile
to give 5.7rc1 a try.
It seems that controller_id and use_smooth_brightness are from atombios
(vbios?) and hardware itself; especially atombios (vbios?) are
responsible for many VGA settings and it's a black box.
Good news is that kernel 5.7 will include some backlight enhancement
lspci -vvnn
from Product Name : Aspire A315-41
model name : AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx
Where the brigthness controll does not work
** Attachment added: "lspci_vvnn_a315_41.out"
fwts output from Product Name : Aspire A315-41G with
cpu model name : AMD Ryzen 5 3500U with Radeon Vega Mobile Gfx
** Attachment added: "fwts-a315-41G"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1861925/+attachment/5336271/+files/fwts_results.log
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lspci -vvn
from the a315-41G (where the brightness controll works)
** Attachment added: "lspci_vvnn_315_41G.out"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1861925/+attachment/5336283/+files/lspci_vvnn_315_41G.out
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As I told I have an other similar laptop with discrete GPU:
Product Name : Aspire A315-41G
With cpu:
model name : AMD Ryzen 5 3500U with Radeon Vega Mobile Gfx
It works.
I'm attaching the fwts output just now...
The command sudo kprobe-perf 'p:dce_abm_set_backlight_level_pwm $arg1
Does this system have two AMD graphic cards? can you please upload the
output of "lspci -vvnn"?
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Title:
BrightnessOutofRange:
So the backlight is set to 255 most of the time (because with that value it is
stable)...
I have pressed the decrease and increase backlight buttons some times:
arg4 is different...
arg5 is 0x0 here too...
Aspire-A315-41:~$ sudo kprobe-perf 'p:dce_abm_set_backlight_level_pwm $arg1
$arg2
I tried Ubuntu Mate 19.10 live on my testing system (AMD Ryzen 5 2500U
with Radeon Vega Graphics - seems to be the same AMD CPU on your Acer),
and brightness control works without any problems even though
actual_brightness has a fixed and higher value.
The below is the latest function can be
So I have tested your custom kernel. It does not fix my problem:
-if the brightness == max_brightness => the display is at max brightness but
stable.
-if the brightness < max_brightness => the display brightness is not stable (is
flashing). the brightness is jumping back and fort on the value
uname -a:
Linux Aspire-A315-41 5.6.0-rc5-custom #8 SMP Tue Mar 10 04:01:57 UTC
2020 x86_64 x86_64 x86_64 GNU/Linux
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Title:
I'm using stock Ubuntu _Mate_ 19.10. Do you think that some other Ubuntu
derivate would be OK?
I have tried the stock kernel 5.3, 5.5, 5.6rc1. I will just try your
kernel! Thanks!
Some more infos:
-if the brightness == max_brightness => the display is at max brightness but it
does not flash.
I tried 19.10 and 20.04 (daily build) on an AMD platform (AMD Ryzen 5
2500U with Radeon Vega Graphics), and the backlight works without
problems.
This platform has the same symptom as described in the bug description -
actual_brightness is a fixed and higher value, and it does not change
with
In theory, max_brightness and brightness are all needed for backlight
control. I am using stock Ubuntu 19.10 & 20.04 with gnome desktop. Are
you using anything special?
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I have tried the the points 1-16 in the document
https://wiki.ubuntu.com/Kernel/Debugging/Backlight
but I think in the latest kernel (5.5++) some parameters are removed.
https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html
Point 10: use_bios_initial_backlight is not found
** Package changed: xserver-xorg-video-amdgpu (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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