https://bugzilla.kernel.org/show_bug.cgi?id=215835
--- Comment #1 from Johannes P (johannes.pens...@gmail.com) ---
# ./ec -r -s 1
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
00: 00 01 00 00 00 00 00 00 00 00 00 00 00 00 29 00
10: 00 00 80 00 01 00 65 04 00 01 9a 20 00 02 00 00
20: 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
40: 00 00 00 00 00 00 00 00 00 00 00 00 8d 52 00 00
50: 00 00 00 31 00 00 2d 00 00 00 00 00 00 00 00 00
60: 00 80 02 03 02 00 00 00 00 00 00 00 00 00 00 00
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80: 00 00 00 00 08 00 00 00 80 00 96 00 20 01 00 4c
90: 47 43 00 32 30 31 39 00 4c 31 39 4c 34 50 46 31
A0: 00 01 00 80 00 00 c0 00 00 00 00 00 00 15 00 00
B0: 2d 2e 00 29 00 23 00 29 02 0d 04 00 00 00 11 00
C0: 30 02 99 1b 33 05 36 43 10 3b 58 1b 9b 1b 64 00
D0: c0 02 e2 02 00 00 00 23 31 0c 0b 00 00 00 00 00
E0: 00 00 00 00 00 00 00 00 00 00 00 00 13 00 43 00
F0: 01 00 00 00 90 51 80 43 00 00 00 00 00 00 00 00
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
00: 00 01 00 00 00 00 00 00 00 00 00 00 00 00 29 00
10: 00 00 80 00 01 00 65 04 00 01 9a 20 00 02 00 00
20: 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
40: 00 00 00 00 00 00 00 00 00 00 00 00 8d 52 00 00
50: 00 00 00 31 00 00 2d 00 00 00 00 00 00 00 00 00
60: 00 80 02 03 02 00 00 00 00 00 00 00 00 00 00 00
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80: 00 00 00 00 08 00 00 00 80 00 96 00 20 01 00 4c
90: 47 43 00 32 30 31 39 00 4c 31 39 4c 34 50 46 31
A0: 00 01 00 80 00 00 c0 00 00 00 00 00 00 15 00 00
B0: 2d *2f 00 29 00 23 00 29 02 *0e 04 00 00 00 11 00
C0: 30 02 99 1b 33 05 36 43 10 3b 58 1b 9b 1b 64 00
D0: *be 02 e2 02 00 00 00 23 31 0c 0b 00 00 00 00 00
E0: 00 00 00 00 00 00 00 00 00 00 00 00 13 00 43 00
F0: 01 00 00 00 90 51 80 43 00 00 00 00 00 00 00 00
With the kernel EC debug tool, it is possible to detect a register change at B9
when pressing the brightness keys. This value is increased/decreased by
pressing the appropriate key, in a range from 0x00 to 0x0F.
If I understand the ACPI specification correctly, the EC is supposed to send
out an interrupt in order for the OS to query the EC and pick up the brightness
event. However, after checking each ACPI debug layer individually at max
verbosity, there seems to be no output whatsoever generated by a key press.
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