[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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Thanks for the suggestion. However, this does not make any difference. I
ran also "watch -n1 cat /proc/interrupts", "acpi_listen" and "sudo
showkey -s" and no reaction to brightness hotkeys whereas volume hotkeys
work and that also shows up when running these commands.
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Please test latest drm-tip kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/drm-tip/current/
Headers are not needed.
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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Hi, unfortunately not. Maybe it will get fixed sometime.
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https://bugs.launchpad.net/bugs/1872311
Title:
Brightness hotkeys not working on Lenovo S740
Status in linux
Elias Julkunen. Did you find any solution? Currently i am facing the
same problem. My hardware is Lenovo Ideapad-5-15ITL05. If you found the
solution can you please share it with me?
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I have the same problem with the Lenovo S740. Brightness hotkeys not
working at all. I've tried several options as stated in
https://wiki.archlinux.org/index.php/Backlight#Kernel_command-line_options
Using acpi_backlight=vendor totally break the backlight, it cannot be
changed even from the
I had similar issue with Lenovo Yoga Slim 7 AMD Ryzen 4700U, in Ubuntu 20.04.1.
Solved by upgrade of kernel to latest upstream (5.8). Another solution for me
was installation of AMDGPU proprietary drivers.
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I discovered this exact same issue, but with a slightly different environment.
Perhaps it's not an Ubuntu bug but an issue with the kernel?
The brightness keys work in Windows.
In linux, I can still adjust the brightness using the power manager slider
despite the keyboard hotkeys not working.
I
Is the panel OLED?
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https://bugs.launchpad.net/bugs/1872311
Title:
Brightness hotkeys not working on Lenovo S740
Status in linux package in Ubuntu:
Confirmed
Bug
Hi, I posted about this here: https://forums.lenovo.com/t5/Ubuntu
/Lenovo-Yoga-S740-14IIL-Brightness-hotkeys-not-working-on-
Ubuntu-20-04/m-p/5011698
Let's hope someone picks up on this - so far no one has.
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It may worth a shot to ask on Lenovo's forum
(https://forums.lenovo.com/t5/English-Community/ct-p/Community-EN).
Perhaps they will forward this to developers who can take a look and
release a fix for everybody.
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Thanks, "sudo showkey -s" does not show anything for the brightness key
combination. Neither do the interrupts increase when the brightness key
combination is pressed. So I assume this cannot be fixed from the
software side.
The brightness keys are working on Windows. However, the laptop is quite
No ACPI interrupts means either BIOS is broken or system is using other
mechanism like scancode from KBC/EC.
Checking scancode is easy: sudo showkey -s
Also checking interrupts: watch -n1 cat /proc/interrupts <-- usually IRQ 1
If there aren't events from KBC/EC, this is a BIOS or a KBC/EC bug.
Thanks for the comments. Please find attached the requested file (sudo
acpidump > acpi.log).
However, "watch -n1 cat /proc/interrupts" did not increase when I used
the Fn + F10/F11 (brightness) button. Contrast to that, the (working)
volume hotkeys increased the interrupts. I also ran
If ACPI approach is used, there are also two different approaches used -
ACPI standard or OEM-specific .
ACPI defines events from brightness up and down, and it is
video/brightnessdown BRTDN 0087 & video/brightnessup BRTUP 0086.
The can be checked by running "acpi_listen" and pressing
The brightness interface (/sys/class/backlight/intel_backlight) is
working, so it must be the missing events that cause your problem.
Ubuntu needs keycodes (KEY_BRIGHTNESSDOWN 224 & KEY_BRIGHTNESSUP 225),
and this can be from either scancode or ACPI events. Laptops usually use
ACPI for
** Attachment added: "xkbcomp.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1872311/+attachment/5352616/+files/xkbcomp.txt
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** Attachment added: "xkbmap.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1872311/+attachment/5352615/+files/xkbmap.txt
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