This has been fixed with a commit as of today:

CVSROOT:        /cvs
Module name:    src
Changes by:     [email protected]        2020/10/25 02:31:40

Modified files:
        sys/dev/acpi   : abl.c

Log message:
Unbreak brightness setting on MacBooks introduced by abl(4).
MacBooks already handle the brightness through the drm driver.  
Therefore only attach abl(4) to iMacs.
  
Issue initially reported by James Luigy.
  
Discussed with kettenis@, ok jung@

On Sun, Oct 25, 2020 at 03:08:16PM +0100, [email protected] wrote:

> >Synopsis:    setting brightness with wsconsctl has no effect
> >Category:    kernel
> >Environment:
>       System      : OpenBSD 6.8
>       Details     : OpenBSD 6.8 (GENERIC.MP) #98: Sun Oct  4 18:13:26 MDT 2020
>                        
> [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
> 
>       Architecture: OpenBSD.amd64
>       Machine     : amd64
> >Description:
> Version 6.7 and earlier supported setting screen brightness using
> wsconsctl. This command has no effect on 6.8. Brightness remains at
> maximum level of 100%.
> 
> >How-To-Repeat:
> 
> undefined# wsconsctl display.brightness                                       
>  
> display.brightness=100.00%
> undefined# wsconsctl display.brightness=50
> display.brightness -> 46.66%
> undefined# wsconsctl display.brightness    
> display.brightness=100.00%
> 
> >Fix:
> not aware of any
> 
> dmesg:
> OpenBSD 6.8 (GENERIC.MP) #98: Sun Oct  4 18:13:26 MDT 2020
>     [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
> real mem = 4174385152 (3981MB)
> avail mem = 4032831488 (3846MB)
> random: good seed from bootblocks
> mpath0 at root
> scsibus0 at mpath0: 256 targets
> mainbus0 at root
> bios0 at mainbus0: SMBIOS rev. 2.7 @ 0x8afac000 (33 entries)
> bios0: vendor Apple Inc. version "194.0.0.0.0" date 04/16/2020
> bios0: Apple Inc. MacBookAir7,1
> acpi0 at bios0: ACPI 5.0
> acpi0: sleep states S0 S3 S4 S5
> acpi0: tables DSDT FACP HPET APIC SBST ECDT SSDT SSDT SSDT SSDT SSDT SSDT 
> SSDT SSDT DMAR MCFG
> acpi0: wakeup devices PEG0(S3) EC__(S3) HDEF(S3) RP01(S3) RP02(S3) RP03(S4) 
> ARPT(S4) RP05(S3) RP06(S3) SPIT(S3) XHC1(S3) ADP1(S3) LID0(S3)
> acpitimer0 at acpi0: 3579545 Hz, 24 bits
> acpihpet0 at acpi0: 14318179 Hz
> acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
> cpu0 at mainbus0: apid 0 (boot processor)
> cpu0: Intel(R) Core(TM) i5-5250U CPU @ 1.60GHz, 1500.25 MHz, 06-3d-04
> cpu0: 
> FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SRBDS_CTRL,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
> cpu0: 256KB 64b/line 8-way L2 cache
> cpu0: smt 0, core 0, package 0
> mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
> cpu0: apic clock running at 100MHz
> cpu0: mwait min=64, max=64, C-substates=0.2.1.2.4.1.1.1, IBE
> cpu1 at mainbus0: apid 2 (application processor)
> cpu1: Intel(R) Core(TM) i5-5250U CPU @ 1.60GHz, 1500.02 MHz, 06-3d-04
> cpu1: 
> FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SRBDS_CTRL,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
> cpu1: 256KB 64b/line 8-way L2 cache
> cpu1: smt 0, core 1, package 0
> cpu2 at mainbus0: apid 1 (application processor)
> cpu2: Intel(R) Core(TM) i5-5250U CPU @ 1.60GHz, 1500.01 MHz, 06-3d-04
> cpu2: 
> FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SRBDS_CTRL,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
> cpu2: 256KB 64b/line 8-way L2 cache
> cpu2: smt 1, core 0, package 0
> cpu3 at mainbus0: apid 3 (application processor)
> cpu3: Intel(R) Core(TM) i5-5250U CPU @ 1.60GHz, 1500.01 MHz, 06-3d-04
> cpu3: 
> FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,RDSEED,ADX,SMAP,PT,SRBDS_CTRL,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
> cpu3: 256KB 64b/line 8-way L2 cache
> cpu3: smt 1, core 1, package 0
> ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 40 pins
> acpiec0 at acpi0
> acpimcfg0 at acpi0
> acpimcfg0: addr 0xe0000000, bus 0-155
> acpiprt0 at acpi0: bus 0 (PCI0)
> acpiprt1 at acpi0: bus -1 (PEG0)
> acpiprt2 at acpi0: bus 1 (RP01)
> acpiprt3 at acpi0: bus 2 (RP02)
> acpiprt4 at acpi0: bus 3 (RP03)
> acpiprt5 at acpi0: bus 5 (RP05)
> acpiprt6 at acpi0: bus 4 (RP06)
> acpisbs0 at acpi0: SBS0 model "bq20z451" serial 36785 type LION oem "DP"
> acpipci0 at acpi0 PCI0: 0x00000004 0x00000011 0x00000001
> acpicmos0 at acpi0
> asmc0 at acpi0: SMC_ (smc-huronriver) addr 0x300/0x20: rev 2.26f626, 612 keys
> "ACPI0008" at acpi0 not configured
> "ACPI0001" at acpi0 not configured
> "APP000D" at acpi0 not configured
> acpiac0 at acpi0: AC unit online
> acpibtn0 at acpi0: LID0
> acpibtn1 at acpi0: PWRB
> abl0 at acpi0: PNLF (backlight)
> acpibtn2 at acpi0: SLPB
> acpicpu0 at acpi0: C3(200@530 mwait.1@0x60), C2(200@148 mwait.1@0x33), 
> C1(1000@1 mwait.1), PSS
> acpicpu1 at acpi0: C3(200@530 mwait.1@0x60), C2(200@148 mwait.1@0x33), 
> C1(1000@1 mwait.1), PSS
> acpicpu2 at acpi0: C3(200@530 mwait.1@0x60), C2(200@148 mwait.1@0x33), 
> C1(1000@1 mwait.1), PSS
> acpicpu3 at acpi0: C3(200@530 mwait.1@0x60), C2(200@148 mwait.1@0x33), 
> C1(1000@1 mwait.1), PSS
> acpivideo0 at acpi0: IGPU
> acpivout0 at acpivideo0: DD01
> cpu0: using VERW MDS workaround (except on vmm entry)
> cpu0: Enhanced SpeedStep 1500 MHz: speeds: 1601, 1600, 1500, 1400, 1300, 
> 1200, 1100, 1000, 900, 800, 700, 600, 500 MHz
> pci0 at mainbus0 bus 0
> pchb0 at pci0 dev 0 function 0 "Intel Core 5G Host" rev 0x09
> inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics 6000" rev 0x09
> drm0 at inteldrm0
> inteldrm0: msi, BROADWELL, gen 8
> azalia0 at pci0 dev 3 function 0 "Intel Core 5G HD Audio" rev 0x09: msi
> azalia0: No codecs found
> xhci0 at pci0 dev 20 function 0 "Intel 9 Series xHCI" rev 0x03: msi, xHCI 1.0
> usb0 at xhci0: USB revision 3.0
> uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 
> addr 1
> "Intel 9 Series DMA" rev 0x03 at pci0 dev 21 function 0 not configured
> "Intel 9 Series SPI" rev 0x03 at pci0 dev 21 function 4 not configured
> "Intel 9 Series MEI" rev 0x03 at pci0 dev 22 function 0 not configured
> azalia1 at pci0 dev 27 function 0 "Intel 9 Series HD Audio" rev 0x03: msi
> azalia1: codecs: Cirrus Logic CS4208
> audio0 at azalia1
> ppb0 at pci0 dev 28 function 0 "Intel 9 Series PCIE" rev 0xe3
> pci1 at ppb0 bus 1
> ppb1 at pci0 dev 28 function 1 "Intel 9 Series PCIE" rev 0xe3: msi
> pci2 at ppb1 bus 2
> "Broadcom BCM15700A2" rev 0x00 at pci2 dev 0 function 0 not configured
> ppb2 at pci0 dev 28 function 2 "Intel 9 Series PCIE" rev 0xe3: msi
> pci3 at ppb2 bus 3
> "Broadcom BCM4360" rev 0x03 at pci3 dev 0 function 0 not configured
> ppb3 at pci0 dev 28 function 4 "Intel 9 Series PCIE" rev 0xe3: msi
> pci4 at ppb3 bus 5
> ppb4 at pci4 dev 0 function 0 vendor "Intel", unknown product 0x156b rev 0x00
> pci5 at ppb4 bus 6
> ppb5 at pci5 dev 0 function 0 vendor "Intel", unknown product 0x156b rev 
> 0x00: msi
> pci6 at ppb5 bus 7
> vendor "Intel", unknown product 0x156a (class system subclass miscellaneous, 
> rev 0x00) at pci6 dev 0 function 0 not configured
> ppb6 at pci5 dev 3 function 0 vendor "Intel", unknown product 0x156b rev 
> 0x00: msi
> pci7 at ppb6 bus 8
> ppb7 at pci5 dev 4 function 0 vendor "Intel", unknown product 0x156b rev 
> 0x00: msi
> pci8 at ppb7 bus 57
> ppb8 at pci5 dev 5 function 0 vendor "Intel", unknown product 0x156b rev 
> 0x00: msi
> pci9 at ppb8 bus 106
> ppb9 at pci5 dev 6 function 0 vendor "Intel", unknown product 0x156b rev 
> 0x00: msi
> pci10 at ppb9 bus 107
> ppb10 at pci0 dev 28 function 5 "Intel 9 Series PCIE" rev 0xe3: msi
> pci11 at ppb10 bus 4
> nvme0 at pci11 dev 0 function 0 "Apple NVMe" rev 0x01: msi, NVMe 1.0
> nvme0: APPLE SSD AP0128H, firmware 7.844.01, serial C08543403VGG6KVAC
> scsibus1 at nvme0: 2 targets, initiator 0
> sd0 at scsibus1 targ 1 lun 0: <NVMe, APPLE SSD AP0128, 7.84>
> sd0: 115712MB, 4096 bytes/sector, 29622272 sectors
> pcib0 at pci0 dev 31 function 0 "Intel 9 Series LPC" rev 0x03
> ichiic0 at pci0 dev 31 function 3 "Intel 9 Series SMBus" rev 0x03: apic 2 int 
> 18
> iic0 at ichiic0
> iic0: addr 0x2c 03=fc 05=6d 06=a0 71=06 72=80 86=5f 90=37 91=22 92=35 93=3b 
> 94=4a 95=8c 96=72 97=84 98=20 99=1d 9a=82 9f=7c a0=7f a1=b5 a2=bf a3=7b a4=28 
> a5=cf a6=64 a7=2d words 00=0000 01=0000 02=00fc 03=fc00 04=006d 05=6da0 
> 06=a000 07=0000
> pchtemp0 at pci0 dev 31 function 6 "Intel 9 Series Thermal" rev 0x03
> isa0 at pcib0
> isadma0 at isa0
> com0 at isa0 port 0x3f8/8 irq 4: ns8250, no fifo
> pcppi0 at isa0 port 0x61
> spkr0 at pcppi0
> vmm0 at mainbus0: VMX/EPT
> efifb at mainbus0 not configured
> urtwn0 at uhub0 port 2 configuration 1 interface 0 "Realtek 802.11n NIC" rev 
> 2.00/0.00 addr 2
> urtwn0: MAC/BB RTL8188EU, RF 6052 1T1R, address 84:16:f9:07:b1:7b
> uhub1 at uhub0 port 3 configuration 1 interface 0 "Apple Inc. BRCM20702 Hub" 
> rev 2.00/1.00 addr 3
> uhidev0 at uhub1 port 1 configuration 1 interface 0 "Apple Computer product 
> 0x820a" rev 2.00/1.00 addr 4
> uhidev0: iclass 3/1, 1 report id
> ukbd0 at uhidev0 reportid 1: 8 variable keys, 6 key codes
> wskbd0 at ukbd0: console keyboard
> uhidev1 at uhub1 port 2 configuration 1 interface 0 "Apple Computer product 
> 0x820b" rev 2.00/1.00 addr 5
> uhidev1: iclass 3/1, 2 report ids
> ums0 at uhidev1 reportid 2: 3 buttons
> wsmouse0 at ums0 mux 0
> ugen0 at uhub1 port 3 "Apple Inc. Bluetooth USB Host Controller" rev 
> 2.00/1.50 addr 6
> uhidev2 at uhub0 port 5 configuration 1 interface 0 "Apple Inc. Apple 
> Internal Keyboard / Trackpad" rev 2.00/1.71 addr 7
> uhidev2: iclass 3/0, 63 report ids
> uhid0 at uhidev2 reportid 63: input=64, output=0, feature=0
> uhidev3 at uhub0 port 5 configuration 1 interface 1 "Apple Inc. Apple 
> Internal Keyboard / Trackpad" rev 2.00/1.71 addr 7
> uhidev3: iclass 3/1, 63 report ids
> ukbd1 at uhidev3 reportid 1: 8 variable keys, 6 key codes, country code 13
> wskbd1 at ukbd1 mux 1
> uhid1 at uhidev3 reportid 9: input=0, output=0, feature=3
> uhid2 at uhidev3 reportid 63: input=64, output=0, feature=0
> ubcmtp0 at uhub0 port 5 configuration 1 interface 2 "Apple Inc. Apple 
> Internal Keyboard / Trackpad" rev 2.00/1.71 addr 7
> wsmouse1 at ubcmtp0 mux 0
> vscsi0 at root
> scsibus2 at vscsi0: 256 targets
> softraid0 at root
> scsibus3 at softraid0: 256 targets
> sd1 at scsibus3 targ 1 lun 0: <OPENBSD, SR CRYPTO, 006>
> sd1: 111551MB, 4096 bytes/sector, 28557310 sectors
> root on sd1a (574ef4fbb9c9635d.a) swap on sd1b dump on sd1b
> inteldrm0: 1366x768, 32bpp
> wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation), using wskbd0
> wskbd1: connecting to wsdisplay0
> wsdisplay0: screen 1-5 added (std, vt100 emulation)
> 
> usbdevs:
> Controller /dev/usb0:
> addr 01: 8086:0000 Intel, xHCI root hub
>        super speed, self powered, config 1, rev 1.00
>        driver: uhub0
> addr 02: 0bda:8179 Realtek, 802.11n NIC
>        high speed, power 500 mA, config 1, rev 0.00, iSerial 00E04C0001
>        driver: urtwn0
> addr 03: 0a5c:4500 Apple Inc., BRCM20702 Hub
>        full speed, self powered, config 1, rev 1.00
>        driver: uhub1
> addr 04: 05ac:820a Apple Computer, product 0x820a
>        full speed, self powered, config 1, rev 1.00
>        driver: uhidev0
> addr 05: 05ac:820b Apple Computer, product 0x820b
>        full speed, self powered, config 1, rev 1.00
>        driver: uhidev1
> addr 06: 05ac:828f Apple Inc., Bluetooth USB Host Controller
>        full speed, self powered, config 1, rev 1.50
>        driver: ugen0
> addr 07: 05ac:0290 Apple Inc., Apple Internal Keyboard / Trackpad
>        full speed, power 500 mA, config 1, rev 1.71, iSerial 
> DQ65413K6GNF94QA53D
>        driver: uhidev2
>        driver: uhidev3
>        driver: ubcmtp0
> 

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