So, I added acpi_backlight=vendor string to the kernel cmdline and backlight controls DO work now contrary to what gets printed to dmesg:
[ 461.856388] ACPI: Failed to switch the brightness
[ 463.473236] ACPI: Failed to switch the brightness
I see that /sys/platform/acer-wmi/backlight/acer-wmi/brightness is present and reflects the current state properly.
I will try building the kernel with the patch you posted and see what happens.
Regarding date: yes, it is a proper date, lshal - power_management.acpi.linux.version = '20090521' , so it is definitely an unitialized memory.
Dear Stefan,
Thanks for your time investigating this bug!
So, I added acpi_backlight= vendor string to the kernel cmdline and backlight controls DO work now contrary to what gets printed to dmesg:
[ 461.856388] ACPI: Failed to switch the brightness
[ 463.473236] ACPI: Failed to switch the brightness
I see that /sys/platform/ acer-wmi/ backlight/ acer-wmi/ brightness is present and reflects the current state properly.
I will try building the kernel with the patch you posted and see what happens.
Regarding date: yes, it is a proper date, lshal - power_managemen t.acpi. linux.version = '20090521' , so it is definitely an unitialized memory.
Thanks again!