Hello, on my HP EliteBook 8460p is not possible to set display brightness when ACPI is enabled in kernel. Entries in sysfs is properly created without errors. But when I try write any value to /sys/class/backlight/acpi_video0/brightness nothing happened (and no error is in dmesg). When I press Fn key for chaining display brightness kernel send correct key event (tested with xev) but nothing happened too. When I disabled ACPI (acpi=off in kernel command line) all Fn keys are broken and not working (no events in xev). But brightness keys working (I think on HW level, because xev does not see it) - increase and decrease display brightness. So what can I do with my notebook? I think that there is error/bug in BIOS or ACPI because with disabled ACPI brightness working. But with disabled ACPI is notebook unuseable (no battery info, no Fn keys, no WIFI rfkill, ...). Can somebody help me with this problem? -- Pali Rohár pali.rohar@xxxxxxxxx
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