** Package changed: xserver-xorg-video-amdgpu (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1861925
Title:
BrightnessOutofRange: Actual brightness for amdgpu_bl0 not in range
0..255
Status in linux package in Ubuntu:
Incomplete
Bug description:
Hi,
I have a acer aspire a315-41 laptop, it has BIOS 1.15, Ubuntu 19.10,
Kernel stock 5.3, and 5.5.0. I have a problem with the Backlight. I
can not control.
According to: https://wiki.ubuntu.com/Kernel/Debugging/Backlight
It is : Backlight control does not work, but there are entries in
/sys/class/backlight.
The problem is as far I could find:
sanya@Aspire-A315-41:/sys/class/backlight/amdgpu_bl0$ cat brightness
135
sanya@Aspire-A315-41:/sys/class/backlight/amdgpu_bl0$ cat actual_brightness
43500
sanya@Aspire-A315-41:/sys/class/backlight/amdgpu_bl0$ cat max_brightness
255
The brightness read from the HW is not in the range, and when I change
the brightness by the keys the value in the brightness file changes
too, but the actual_brightness is stuck at the value 43500...
I have tried all the steps mentioned in
https://wiki.ubuntu.com/Kernel/Debugging/Backlight
Actually I have tried all these kernel startup parameter variants
without luck:
GRUB_CMDLINE_LINUX_DEFAULT=""
#GRUB_CMDLINE_LINUX_DEFAULT="video.use_native_backlight=1"
#GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi="
#GRUB_CMDLINE_LINUX_DEFAULT="video.use_bios_initial_backlight=0"
#GRUB_CMDLINE_LINUX_DEFAULT="amdgpu.dcfeaturemask=0x4 amdgpu.abmlevel=2"
#GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=video amdgpu.abmlevel=1"
#GRUB_CMDLINE_LINUX_DEFAULT="i8042.nopnp acpi_osi=Linux acpi_backlight=vendor"
#GRUB_CMDLINE_LINUX_DEFAULT="i8042.nopnp acpi_osi=! acpi_osi=\"Windows 2009\"
acpi_backlight=vendor"
#GRUB_CMDLINE_LINUX_DEFAULT="i8042.nopnp acpi_osi=! acpi_osi=\"Windows 2009\"
acpi_backlight=video"
#GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi=! acpi_osi=\"Windows 2009\"
acpi_backlight=vendor"
#GRUB_CMDLINE_LINUX_DEFAULT="i8042.nopnp acpi_osi=! acpi_osi=\"Windows 2009\"
acpi_backlight=vendor"
#GRUB_CMDLINE_LINUX_DEFAULT="i8042.nopnp acpi_osi=! acpi_osi=\"Windows 2009\"
acpi_backlight=vendor"
I guess the fwts has found also this as an error:
autobrightness: Automated LCD brightness test.
--------------------------------------------------------------------------------
Test 1 of 2: Test for maximum and actual brightness.
PASSED: Test 1, Maximum brightness for amdgpu_bl0 is 255 which is sane.
FAILED [HIGH] BrightnessOutofRange: Test 1, Actual brightness for amdgpu_bl0
not
in range 0..255.
Test 2 of 2: Change actual brightness.
FAILED [MEDIUM] BrightnessMismatch: Test 2, 256 brightness levels did not
match
the brightnesss level just set for backlight amdgpu_bl0.
The failed brightness levels were: 0-255.
It would be great if someone could help set the HW brightness back to
the normal range.
If you need any more debug files please let me know!
Thanks,
Regards,
Sandor
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