I disabled dithering on Apple silicon + Introducing Stillcolor macOS M1/M2/M3

DisplaysShouldNotBeTVs

waydabber It might be better simply to combine that setting with the dither one as with dither off the uniformity2D looks much worse anyway.

Yeah it definitely makes sense to me too to combine disabling dithering and disabling uniformity2D into one toggle

waydabber

DisplaysShouldNotBeTVs I added a separate toggle (available for built-in Liquid Retina displays on Apple Silicon). https://github.com/waydabber/BetterDisplay/issues/2815

(I am not sure whether the setting is used/working on the old M1 MBA, 13" MBP or the iMac, if it is, I can enable it for notchless built-in screens as well).

waydabber

async Yes, of course the icon always shows the proper status (the app reads the value). 😃

Rikl

waydabber

M1 Air

ioreg -lw0 | grep -i uniformity

DannyD2

markdotpeters5 If displayspecifications.com is accurate, what you're seeing is expected. That's an 8 bit+FRC monitor that can accept 10 bit wide input. Betterdisplay+virtual slices off the lower 2 bits so you're going to see more banding.

markdotpeters5

DannyD2 thanks that makes sense. Not sure it’s comfortable enough for me to use but giving it another go tomorrow.

waydabber

Rikl Thanks!

DisplaysShouldNotBeTVs

Got 2 M2 Airs side by side and can already tell one (refurbished, higher specs) is WAY better than the other (new, base model). Refurbished has reddish tint (which I like), new in box has greenish/yellowish tint (which I hate). Colors on refurbished also look more stable even before installing Stillcolor.

Panel variation on M2 Airs is real!

If you don't like one M2 Air, it's totally worth it to try a second one, as it might be entirely different!

Still need to check if this refurbished M2 Air with reddish tint is actually fully usable, but I can already tell I have a lot less strain on it compared to the new one with greenish yellow tint. And yet again, both are max brightness and 1280 @2x resolution with no True Tone.

FWIW, refurbished (better) has 13.4 and new (worse) has 13.3.

I also now can test out an M2 Pro TouchBar 👀👀

I'll check for effects of uniformity2D on that model too

Sentiny

DisplaysShouldNotBeTVs You need to try same MacOS versions on both. Anyway I am sure there are different display vendors for MBA.

DisplaysShouldNotBeTVs

Booted up 13" M2 Pro TB with Ventura 13.6.6.

Both the refurbished Air and refurbished TB Pro are more comfortable than the base model Air.

However, text feels weirdly blurry on TB Pro in a unique way — I don't feel this on the refurb Air or even the bad base model Air. Not related to 13.6.6 as it was on 13.2 before an auto update happened and text also felt kinda blurry there too. Auto update is disabled on the Airs and now is disabled on the TB Pro too.

All at 1280 width resolution (native 2x scaling), all have True Tone off, all have Night Shift off, all are at max brightness. Touch Bar is disabled on M2 Pro TB.

All 3 Macs now have Stillcolor and dithering disabled.

Both refurb M2 Air and M2 TB Pro feel way better than the base model M2 Air which is immediately way more unstable, more fuzzy looking especially on light backgrounds, and more straining to look at compared to the other two.

There's also a really strange panel variation with TB Pro where whites start reddish on left and then become greenish on right… totally noticeable and can even be captured on camera. Not related to Wallpaper Tinting as it occurs with it off.

uniformity2D on (default) has blotches on both refurb and base M2 Airs when dithering is disabled, and can fix blotches on both by disabling uniformity2D.

However, even though uniformity2D can successfully be modified on the TB Pro, it actually doesn't even have blotches when dithering is disabled anyway. This confirms that Macs with rounded displays like the M2 Air use additional color calibrations by default, compared to rectangular screens like the TB Pro.

Due to this, I don't notice any changes enabling or disabling it on the TB Pro at first glance, but will have to test more thoroughly with Software Brightness etc.

I'll test the 10 bit banding test image on all of them to see if the "millions of colors" display (the TB Pro) has more bands than the others or if they all look the same if dithering is disabled.

Base model M2 Air is going back for sure. Will mostly be testing refurb M2 Air vs. refurb M2 TB Pro with some real work now, seems like that's what I'll need to do to understand which one causes more or less strain.

On a side note, aside from the screen, the ergonomics and weight of the TB Pro is essentially perfect for me (except for the Touch Bar…), and on the other hand, I love the visual aesthetics of the M2 Air although it is much less ergonomic to me and noticeably more "fragile feeling" than the TB Pro.

And of course, having real function keys on the M2 Air makes me really want the Air to be the one that works out for me. Going to have to test really in depth here.

karut

DisplaysShouldNotBeTVs what are the specs of the refurb MBA M2? Probably not related to them though and just panel lottery, right?

async

DisplaysShouldNotBeTVs Super interesting. you should be able to get the manufacturer and date from the ColorSync Utility or this command.

Open ColorSync Utility -> open Computer/Displays/Colour LCD from the left panel -> Open profile (top right corner)-> NO.17 Apple display make and model information.

system_profiler SPDisplaysDataType | grep "Display Type"

Also it would be interesting to compare them with XDR upscaling in BetterDisplay if that exists on Air as well. That made the botching waaaay more noticeable on my Pro M1 Max

Could diff the output from Allrez as well

wlmsn

DisplaysShouldNotBeTVs what is the "TB" Part of the M2 Pro TB?

DisplaysShouldNotBeTVs

karut

Refurb M2 TB Pro: 24GB 1TB 8-core CPU 10-core GPU Ventura 13.6.6

Refurb M2 Air: 24GB 2TB 8-core CPU 10-core GPU Ventura 13.4

Base M2 Air: 8GB 512GB 8-core CPU 10-core GPU Ventura 13.3

DisplaysShouldNotBeTVs

async This tells me nothing, all 3 (base Air, refurb Air, refurb TB Pro) all have an identical """serial number""" of FD626D62. TB Pro has a different model of A049 but both Airs have A053. All have manufacturer 610.

This doesn't seem to mean anything as I can already clearly tell that both Airs have different panels.

Running the system profile command gives me the very generic response of just "Display Type: Built-In Liquid Retina Display" or "Display Type: Built-In Retina LCD" depending on if it's an Air or a TB Pro.

None of these have XDR (mini-LED) displays so XDR upscaling does not exist on these Macs.

DisplaysShouldNotBeTVs

FYI y'all, Preview.app is not a good way to test that 1 bit to 12 bit banding test image. It uses spatial dithering (non-moving), even when OS temporal dithering is disabled, at least on both the M2 Air and the M2 TB Pro.

This can be verified by zooming in with Accessibility Ctrl+Scroll zoom with Zoom image smoothing disabled, there is an obvious spatial dither pattern being added by Preview itself that is visible (this pattern is actually visible on all bit depths, including below 8-bit!).

async

DisplaysShouldNotBeTVs Try this command

09:00:14 λ ioreg -lw0 | grep -e "panel-serial-number" -e coverglass
    | |     "coverglass-serial-number" = <"F0Y15120136PP619Q">
    | |     "raw-panel-serial-number" = <"F0Y15120136PP619Q+000000001F20B7+PROD+Y000000000000+00000000000000000000000000+PA25M1103Y03010914+2671D9K9Y98002133TIYWHANBN1711507+SNRYNRYFBASNRYNRYFBASNRZNRZV1ASNRZNRZV">

async

Tbh I feel like there is something strange going on with the MBP. Almost like adjusting things suddenly turns it all to shit again. Hard to pinpoint if it is the display or neurological. Or somehow related to system load or temperature. My display has been exceptional all day with BetterDisplay, custom color profile + xdr profile, metal color adjustments and color table adjustments off. I guess in theory it could be related to timings and pixel inversion, where changing something ends up with some other offset. Or maybe I choose a "bad" scaled resolution where things play nicely with whatever artifacts is at play. I'll check tomorrow

DisplaysShouldNotBeTVs

async XDR MBP display will never be truly good until there is more progress trying to modify the display behavior at the TCON level.

Because of the local dimming from the miniLED array (which basically uses a slightly different PWM frequency on every miniLED zone since the display is never 100% uniformly backlit) — and the hardware-level color calibration that uses reference modes (likely utilizing the TCON-level DITHER_LUT that can't be disabled yet) in addition to any color profile.

Any other modern Mac, even the bad base model Air that I'm testing, is still leagues and leagues better than any XDR miniLED Pro even with tweaks.

async

DisplaysShouldNotBeTVs wild thought, but make sure the 8gb has enough ram free, just in case it affects how it handles the screen. Most likely not a factor, but you could make the case for doing things like keeping less frames in the buffer or not using 10 bit to save memory. Never checked if I'm running out of ram when I have the most issues with my machine, but it could be, as I just closed a ton of stuff

DisplaysShouldNotBeTVs

New discovery:

When dithering is disabled (on both Macs)…

Banding on grayscale banding test image slightly changes on both M2 Airs when adjusting hardware backlight with default macOS brightness slider (even if uniformity2D is off)

On M2 TB Pro, banding does not change regardless of hardware backlight level.

DisplaysShouldNotBeTVs

So far I'm actually preferring the refurb 13" M2 TB Pro a bit over the refurb M2 Air, both with dithering disabled, because using the Air I start getting this really noticeable pressure in my left eye as if it can't relax.

When I'm using the TB Pro, even with the strange "reddish on left and greenish on right" multicolor tint of the display that's definitely a panel lottery defect, I'm finding myself much more easily being able to relax my eyes, despite the image feeling less sharp in some contexts compared to the Air. (Both are at native @2x resolution)

Due to this, I'm going to also update the refurb M2 Air from 13.4 to 13.6.6 which is what the M2 TB Pro has. Then I can compare both on the same OS version.

Something that I'm not sure about is do the TB Pros & M1 Air vs. the rounded corner M2 Airs use a different backlighting style?

On the iPhones, backlight was edge-lit (on the bottom or sides within the bezel), until the Liquid Retina LCD iPhone XR, where backlight was direct lit (backlight right behind the screen pointing directly into your eyes).

Is the M2 Air direct lit (due to the thinner bezels and rounded corners) and the TB M2 Pro edge lit? Or are they BOTH edge lit? I don't know and wasn't able to easily find this online either.

DisplaysShouldNotBeTVs

async Alright, this actually does differ between both M2 Airs (which by the way, are both now on 13.6.6 and the same System Firmware and OS Loader version, yet still have totally different panels)

Not sure if the first part that's duplicated between the coverglass serial and the raw panel serial (which is true on my laptops too) could personally identify my Mac in any way, so I excluded it for now. If the part before the first + is ever needed to actually verify the manufacturer of the panel I have saved both of them for later.

Refurb M2 Air (better panel):

raw-panel-serial-number = FP133[excluded]+5A2D380101A7CA+PROD+Y333433413346+5433812M33812133812D338120+PA31P0710Y61030803+6860A2319KH2YF00A28EY3148B3963008+S36M689U93S36M689U93S36M689U93S36M689U

Base M2 Air (worse panel):

raw-panel-serial-number = FP130[excluded]+5A2A220071A1GH+PROD+B250625142525+78301416301411301415301410+K32820884Y83121002+6859A2232KR4F900M26SY2236A2AE3538+S29Q689BN5S29Q689BN5S29Q689BN5S29Q689B

Also…

13" M2 Touch Bar MacBook Pro (pretty decent comfort but yellow tint & uneven color accuracy):

raw-panel-serial-number = F0Y23[excluded]+000000000P11C5+PROD+Y000000000000+00000000000000000000000000+PY19N0709PA07N0717+6755DKF4P9002214TTTYYW1EA80526916+S6896893Z8S6896893Z8S68968932US6896893

14" M1 Max MacBook Pro (TERRIBLE):

raw-panel-serial-number = FMX14[excluded]+DE1S1904235057+PROD+B135713821393+2C144213144212144227144320+K70410693Y42110704+6550N2119K9C3400TIYWLG9FNA121441B+S1840NRG7VS1840NRG7VS1840NRG7VS1840NRG

Side note: weirdly enough have been feeling pretty good with the M2 Air so far today but just got some strain by going back to the M2 TB Pro to run that command (both have dithering disabled)… refurb M2 Air is actually feeling the best as of right now, still need to try doing a lot more work on this laptop today to make the final decision.

async

Some more interesting backlight and pwm values. No idea if these can be manipulated.

ioreg -lrbit -d0 -w0 -r -c AppleARMPE

......

      +-o backlight  <class IORegistryEntry:IOService:IOPlatformDevice, id 0x10000029c, registered, matched, active, busy 0 (553 ms), retain 8>
      | | {
      | |   "mA2Nits2ndOrderCoef" = <f1ffffff>
      | |   "milliAmps2DACTablePart2" = <8f059d05ab05b805c505d105dd05e805f305fe05080612061c0625062e0637064006480650065806600668066f0677067e0685068c0693069906a006a606ac06b206b806be06c406ca06cf06d506da06df06e506ea06ef06f406f906fe06020707070c071007150719071e07220726072a072f07330737073b073f07430747074a074e075207560759075d076007640768076b076e077207750778077c077f078207850789078c078f079207950798079b079e07a107a407a707aa07ac07af07b207b507b807ba07bd07c007c207c507c807ca07cd07cf07d207d407d707d907dc07de07e107e307e507e807ea07ec07ef07f107f307f607f807fa07fc07fe07>
      | |   "min-restriction-disableth" = <2c010000>
      | |   "nits2mAmps1stOrderCoef" = <94470d00>
      | |   "pre-strobe-dim-period" = <64000000>
      | |   "truetone-shift-a" = <0080fbff>
      | |   "LmaxProduct" = <00004006>
      | |   "LmidProduct" = <00008c00>
      | |   "truetone-shift-b" = <9a190200>
      | |   "blr-cct-warning" = <ac0d0000>
      | |   "calibratedMidCurrent" = <30330300>
      | |   "max-restriction-disableth2" = <b0040000>
      | |   "EDRPotentialHeadroom" = <00001000>
      | |   "min-restriction-enableth" = <58020000>
      | |   "nits2mAmps2ndOrderCoef" = <cca00000>
      | |   "backlight-calibration" = <00000000000000000000000000000000>
      | |   "calibratedMaxCurrent" = <bfcc0d00>
      | |   "use-trinity" = <01000000>
      | |   "LminProduct" = <00000400>
      | |   "user-accessible-max-nits" = <0000f401>
      | |   "nits2mAmps0thOrderCoef" = <dd040000>
      | |   "max-restriction-disableth" = <20030000>
      | |   "mA2Nits0thOrderCoef" = <a5ffffff>
      | |   "AAPL,phandle" = <6e010000>
      | |   "milliAmps2DACPart1MaxCurrent" = <00a00200>
      | |   "backlight-marketing-table" = <0000000000000400d7a306003d0a0b009959120089811e00a3b03200703d540000008c00d723a4003373c00066a6e100ec91080134333601c2b56b01a470aa010000f401>
      | |   "milliAmps2DACPart2MaxCurrent" = <00801100>
      | |   "milliAmps2DACTablePart1" = <000000000000000038008100bd00f0001c01430165018501a101bc01d401eb010002140227023802490259026902770285029302a002ac02b802c402cf02d902e402ee02f80201030b0314031c0325032d0335033d0345034d0354035b0362036903700377037d0384038a03900396039c03a203a703ad03b303b803bd03c303c803cd03d203d703dc03e103e503ea03ef03f303f803fc030004050409040d041104150419041d042104250429042d043104340438043c043f04430446044a044d045104540457045b045e046104640468046b046e047104740477047a047d0480048304860489048b048e0491049404970499049c049f04a104a404a704a904ac04ae04b104b304b604b804bb04bd04c004c204c504c704c904cc04ce04d004d304d504d704d904dc04de04e004e204e404e704e904eb04ed04ef04f104f304f504f704f904fb04fd04ff04010503050505070509050b050d050f05110513051505160518051a051c051e052005210523052505270529052a052c052e052f05310533053505360538053a053b053d053f054005420544054505470548054a054c054d054f0550055205530555055605580559055b055c055e055f056105620564056505670568056a056b056d056e056f0571057205740575057605780579057b057c057d057f05800581058305840585058705880589058b058c058d058f05>
      | |   "name" = <"backlight">
      | |   "backlight-update-policy" = <01000000>
      | |   "iDAC2MilliAmpsTable" = <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>
      | |   "max-restriction-factor" = <41030000>
      | |   "device_type" = <"backlight">
      | |   "use-AAB-architecture" = <01000000>
      | |   "min-restriction-factor" = <d0070000>
      | |   "thermal-mitigation" = <02000000>
      | |   "max-restriction-enableth" = <2c010000>
      | |   "max-restriction-factor-aaboff" = <41030000>
      | |   "use-cabal" = <01000000>
      | |   "thermal-mitigation-min-cap" = <00002c01>
      | |   "sync-backlight-off" = <01000000>
      | |   "sync-wake-ramp" = <01000000>
      | |   "min-restriction-factor-aaboff" = <d0070000>
      | |   "default-whitepoint-type" = <01000000>
      | |   "dcp-brightness-node" = <01000000>
      | |   "energy-saving" = <01000000>
      | |   "mA2Nits1stOrderCoef" = <40130000>
      | | }
      | |
      | +-o AppleARMBacklight  <class IORegistryEntry:IOService:AppleARMBacklight, id 0x1000003d9, registered, matched, active, busy 0 (2 ms), retain 11>
      |     {
      |       "IOClass" = "AppleARMBacklight"
      |       "backlight-control" = Yes
      |       "IOPersonalityPublisher" = "com.apple.driver.AppleARMPlatform"
      |       "IOMatchedAtBoot" = Yes
      |       "IOReportLegendPublic" = Yes
      |       "IOFunctionParent0000016E" = <>
      |       "IOProviderClass" = "IOPlatformDevice"
      |       "backlight-marketing-table" = <0000000000000400d7a306003d0a0b009959120089811e00a3b03200703d540000008c00d723a4003373c00066a6e100ec91080134333601c2b56b01a470aa010000f401>
      |       "IOProbeScore" = 0
      |       "IONameMatch" = "backlight"
      |       "CurrentNits" = 0
      |       "CFBundleIdentifierKernel" = "com.apple.driver.AppleARMPlatform"
      |       "IOMatchCategory" = "IODefaultMatchCategory"
      |       "CFBundleIdentifier" = "com.apple.driver.AppleARMPlatform"
      |       "IONameMatched" = "backlight"
      |       "new-backlight-architecture" = Yes
      |       "IODisplayParameters" = {"BrightnessMilliNits"={"min"=3979,"value"=381794,"uncalMilliNits"=140000,"max"=1599999},"brightness"={"min"=0,"max"=65536,"value"=32768},"rawBrightness"={"min"=0,"max"=2047,"value"=1488},"BrightnessMicroAmps"={"min"=51,"max"=13799,"value"=3199}}
      |       "IOGeneralInterest" = "IOCommand is not serializable"
      |       "IOReportLegend" = ({"IOReportGroupName"="backlight report","IOReportChannels"=((7883943812519781236,4295098369,"MIE factor"),(7237392492480521076,4295098369,"DPB factor")),"IOReportChannelInfo"={"IOReportChannelUnit"=0},"IOReportSubGroupName"="playback backlight factors report"},{"IOReportGroupName"="backlight report","IOReportChannels"=((7883941965834841456,4295229441,"MicroAmps value"),(7883951835569875316,4295229441,"MilliNits value"),(8461535189295243374,4295229441,"UncalMilliNits value"),(7093848255916941430,4295229441,"UserBrightness value"),(7093848255916941426,4295229441,"RawBrightness value")),"IOReportChannelInfo"={"IOReportChannelUnit"=0},"IOReportSubGroupName"="brightness report"})
      |       "backlight-calibration-parameters" = {"lMinPanel"=260799,"current-for-mid-backlight"=209712,"lMidProduct"=9175040,"hardware-max-current-limit"=1146880,"lMaxPanel"=104857599,"current-for-max-backlight"=904383,"lMaxProduct"=104857600,"milliAmps2NitsScaleFactor"=105629642,"lMidPanel"=25021279,"lMinProduct"=262144}
      |     }
      |

...

          +-o pwm1@9B030000  <class IORegistryEntry:IOService:AppleARMIODevice, id 0x100000375, registered, matched, active, busy 0 (248 ms), retain 8>
          | | {
          | |   "interrupt-parent" = <82000000>
          | |   "compatible" = <"pwm,t6000","pwm,s5l8920x">
          | |   "reg" = <0000039b010000000040000000000000>
          | |   "interrupts" = <68040000>
          | |   "IODeviceMemory" = (({"address"=15485566976,"length"=16384}))
          | |   "clock-gates" = <83000000>
          | |   "IOInterruptControllers" = ("IOInterruptController00000082")
          | |   "IOInterruptSpecifiers" = (<68040000>)
          | |   "device_type" = <"pwm">
          | |   "AAPL,phandle" = <66010000>
          | |   "name" = <"pwm1">
          | | }
          | |
          | +-o AppleS5L8920XPWM  <class IORegistryEntry:IOService:AppleARMPWM:AppleS5L8920XPWM, id 0x100000462, registered, matched, active, busy 0 (0 ms), retain 5>
          |     {
          |       "IOProbeScore" = 0
          |       "CFBundleIdentifier" = "com.apple.driver.AppleS5L8920XPWM"
          |       "IOProviderClass" = "AppleARMIODevice"
          |       "IOClass" = "AppleS5L8920XPWM"
          |       "IOPersonalityPublisher" = "com.apple.driver.AppleS5L8920XPWM"
          |       "CFBundleIdentifierKernel" = "com.apple.driver.AppleS5L8920XPWM"
          |       "IOMatchedAtBoot" = Yes
          |       "IONameMatch" = "pwm,s5l8920x"
          |       "IOMatchCategory" = "IODefaultMatchCategory"
          |       "IONameMatched" = "pwm,s5l8920x"
          |       "IOFunctionParent00000166" = <>
          |     }
          |

...

          | +-o AppleS5L8920XFPWM  <class IORegistryEntry:IOService:AppleARMPWM:AppleS5L8920XFPWM, id 0x100000381, registered, matched, active, busy 0 (226 ms), retain 6>
          |   | {
          |   |   "IOClass" = "AppleS5L8920XFPWM"
          |   |   "CFBundleIdentifier" = "com.apple.driver.AppleS5L8920XPWM"
          |   |   "IOProviderClass" = "AppleARMIODevice"
          |   |   "FPWM Frequency" = 0
          |   |   "IOProbeScore" = 0
          |   |   "IONameMatch" = "fpwm,s5l8920x"
          |   |   "IOMatchedAtBoot" = Yes
          |   |   "IOMatchCategory" = "IODefaultMatchCategory"
          |   |   "IOFunctionParent00000045" = <>
          |   |   "IONameMatched" = "fpwm,s5l8920x"
          |   |   "IOPersonalityPublisher" = "com.apple.driver.AppleS5L8920XPWM"
          |   |   "CFBundleIdentifierKernel" = "com.apple.driver.AppleS5L8920XPWM"
          |   | }
          |   |
          |   +-o kbd-backlight@0  <class IORegistryEntry:IOService:AppleARMPWMDevice, id 0x100000382, registered, matched, active, busy 0 (225 ms), retain 7>
          |       {
          |         "nits-to-pwm-percentage-part1" = <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>
          |         "high-period" = 351
          |         "AAPL,phandle" = <46000000>
          |         "reg" = <00000000>
          |         "low-period" = 609
          |         "device_type" = <"pwm0">
          |         "IOFunctionParent00000046" = <>
          |         "pwm-frequency" = 24000000
          |         "amplitude" = 4294967296
          |         "enabled" = Yes
          |         "default-hz" = <a8610000>
          |         "name" = <"kbd-backlight">
          |         "nits-to-pwm-percentage-part2" = <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>
          |       }
          |

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