Failing on Big Sur with Apple Silicon

[gordonbazeley]

Hi - I've just got a new MacBook Pro running on Big Sur with Apple Silicon. The brightness command is now failing e.g.

brightness -l
display 0: main, active, awake, online, external, ID 0x2
brightness: failed to get brightness of display 0x2 (error -536870201)
display 1: active, awake, online, built-in, ID 0x1
brightness: failed to get brightness of display 0x1 (error -536870201)

I'm not sure whether this is down to Big Sur or Apple Silicon - any assistance would be appreciated

[nriley]

Sorry, no Apple Silicon Mac here probably until next year. Do you have 2 displays or is it finding the Touch Bar? Nicholas

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On Dec 8, 2020, at 5:12 AM, gordonbazeley ***@***.***> wrote:  Hi - I've just got a new MacBook Pro running on Big Sur with Apple Silicon. The brightness command is now failing e.g. brightness -l display 0: main, active, awake, online, external, ID 0x2 brightness: failed to get brightness of display 0x2 (error -536870201) display 1: active, awake, online, built-in, ID 0x1 brightness: failed to get brightness of display 0x1 (error -536870201) I'm not sure whether this is down to Big Sur or Apple Silicon - any assistance would be appreciated — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub, or unsubscribe.

[gordonbazeley]

No worries. This result is with a second display connected Thanks, Gordon On Tue, 8 Dec 2020 at 12:28, Nicholas Riley <notifications@github.com> wrote:

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Sorry, no Apple Silicon Mac here probably until next year. Do you have 2 displays or is it finding the Touch Bar? Nicholas > On Dec 8, 2020, at 5:12 AM, gordonbazeley ***@***.***> wrote: > >  > Hi - I've just got a new MacBook Pro running on Big Sur with Apple Silicon. The brightness command is now failing e.g. > > brightness -l > display 0: main, active, awake, online, external, ID 0x2 > brightness: failed to get brightness of display 0x2 (error -536870201) > display 1: active, awake, online, built-in, ID 0x1 > brightness: failed to get brightness of display 0x1 (error -536870201) > > I'm not sure whether this is down to Big Sur or Apple Silicon - any assistance would be appreciated > > — > You are receiving this because you are subscribed to this thread. > Reply to this email directly, view it on GitHub, or unsubscribe. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#34 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AHC2WFWTHINAU53ZGSNCOWLSTYLRJANCNFSM4URXX5MA> .

[mgguinne]

This happens for me on a 2020 Macbook Air M1 (Big Sir) with no touch bar and no external screen connected.

brightness 0.3 brightness: failed to set brightness of display 0x1 (error -536870201)

Model Identifier: MacBookAir10,1
Memory: 16 GB
System Firmware Version: 6723.61.3
System Version: macOS 11.1 (20C69)
Kernel Version: Darwin 20.2.0
System Integrity Protection: Enabled

Can't seem to find anything else to work other than using
osascript -e 'tell application "System Events"' -e 'key code 144' -e ' end tell

[nriley]

Sorry I don’t have a Big Sur or M1 Mac for the moment (or any free time to work on this). If anyone else can figure this out, happy to accept patches.

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On Jan 24, 2021, at 7:17 PM, mgguinne ***@***.***> wrote: This happens for me on a 2020 Macbook Air M1 (Big Sir) with no touch bar and no external screen connected. brightness 0.3 brightness: failed to set brightness of display 0x1 (error -536870201) Model Identifier: MacBookAir10,1 Memory: 16 GB System Firmware Version: 6723.61.3 System Version: macOS 11.1 (20C69) Kernel Version: Darwin 20.2.0 System Integrity Protection: Enabled Can't seem to find anything else to work other than using osascript -e 'tell application "System Events"' -e 'key code 144' -e ' end tell — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#34 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAQVT6W3A2YKLSHY4C262DS3S2CRANCNFSM4URXX5MA>.

[elliottkember]

Homebrew version gives me the same as above. When compiled directly from source I get:

MacBook-Pro ~/Sites/brightness(master) ./brightness -l -v
display 0: main, active, awake, online, built-in, ID 0x1
	resolution 1680 x 1050 pt (3360 x 2100 px) @ 60.0 Hz, origin (0, 0)
	physical size 286 x 179 mm
	IOKit flags 0x3; IOKit display mode ID 0xb
	usable for desktop GUI, uses OpenGL acceleration
display 0: brightness 1.000000

But - the 1.000000 is not correct, and never changes regardless of my actual brightness setting.

[maxgfr]

+1

[jtbandes]

I have a proposed fix: #36

Can anyone help test it out on older systems?

[dPowNextdoor]

This is failing for my external monitor (15.6-inch) plugged in via USB-C.

Hardware:

• System: Big Sur (11.4), 2019, 16-inch (built-in) display
• Processor: 2.4 GHz 8-Core Intel Core i9
• Memory: 32 GB 2667 MHz DDR4
• Graphics: AMD Radeon Pro 5300M 4 GB; Intel UHD Graphics 630 1536 MB

Do you have any ideas why, or suggestions for fixes?