https://bugzilla.kernel.org/show_bug.cgi?id=215835

--- Comment #2 from Johannes P (johannes.pens...@gmail.com) ---
Calling the brightness EC query method directly through the kernel ACPI
debugger does not result in a change in value for the aforementioned register
at B9. It appears to be dependent on a key press. 
Maybe it's also worth mentioning that when calling _Q11/_Q12, my trace wasn't
able to pick up anything from GFX0.DD1F.

- debug \_SB.PC00.LPCB.EC0._Q12
Evaluating \_SB.PC00.LPCB.EC0._Q12
AML Opcode: 0070 Store


% 
ArgObj:  000000000dee6495 <Node>          Name P80B RegionField
0000000052e7b4ee
ArgObj:  000000008674c39a <Obj>           Integer 0000000000000012
ResultObj: 000000008674c39a <Obj>           Integer 0000000000000012

AML Opcode: 0086 Notify


% 
ArgObj:  0000000073452c4b <Obj>           Integer 0000000000000086
ArgObj:  00000000f420e657 <Node>          Name DD1F Device
AML Opcode: 0086 Notify


% 
ArgObj:  0000000073452c4b <Obj>           Integer 0000000000000080
ArgObj:  0000000072854c9d <Node>          Name VPC0 Device
Evaluation of \_SB.PC00.LPCB.EC0._Q12 returned object 000000001a14f500,
external buffer length 18
 [Integer] = 0000000000000012




[ 1731.602892]   extrace-0138 ex_trace_point        : Method Begin
[0x00000000bd1e9420:\_SB.PC00.LPCB.EC0.VPC0.VPCW] execution.
[ 1731.604041]   extrace-0138 ex_trace_point        : Method End
[0x00000000bd1e9420:\_SB.PC00.LPCB.EC0.VPC0.VPCW] execution.
[ 1731.604067]   extrace-0138 ex_trace_point        : Method Begin
[0x000000000372cbfe:\_SB.PC00.LPCB.EC0.VPC0.VPCR] execution.
[ 1731.604890]   extrace-0138 ex_trace_point        : Method End
[0x000000000372cbfe:\_SB.PC00.LPCB.EC0.VPC0.VPCR] execution.
[ 1731.604917]   extrace-0138 ex_trace_point        : Method Begin
[0x000000000372cbfe:\_SB.PC00.LPCB.EC0.VPC0.VPCR] execution.
[ 1731.605023]   extrace-0138 ex_trace_point        : Method End
[0x000000000372cbfe:\_SB.PC00.LPCB.EC0.VPC0.VPCR] execution.
[ 1731.605037]   extrace-0138 ex_trace_point        : Method Begin
[0x00000000bd1e9420:\_SB.PC00.LPCB.EC0.VPC0.VPCW] execution.
[ 1731.605752]   extrace-0138 ex_trace_point        : Method End
[0x00000000bd1e9420:\_SB.PC00.LPCB.EC0.VPC0.VPCW] execution.
[ 1731.605766]   extrace-0138 ex_trace_point        : Method Begin
[0x000000000372cbfe:\_SB.PC00.LPCB.EC0.VPC0.VPCR] execution.
[ 1731.606439]   extrace-0138 ex_trace_point        : Method End
[0x000000000372cbfe:\_SB.PC00.LPCB.EC0.VPC0.VPCR] execution.
[ 1731.606464]   extrace-0138 ex_trace_point        : Method Begin
[0x000000000372cbfe:\_SB.PC00.LPCB.EC0.VPC0.VPCR] execution.
[ 1731.606555]   extrace-0138 ex_trace_point        : Method End
[0x000000000372cbfe:\_SB.PC00.LPCB.EC0.VPC0.VPCR] execution.

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