iMac 2020, 5700XT - graphical glitch?

[ninecows]

I'm yet to see the white line. I have the corner-flickering going on, but as mentioned earlier not on all apps.

5700XT, standard scaling and no secondary monitor. Changed my background color to black to make it more clear.

I'm a bit curious of how frequent the white line appears. I'm not working constantly on my Mac so chances are that I will miss it, but I have just spend the last hour looking for it without any luck. So I'm not saying it isn't there, but I just think I would have seen it by now...

So this is why I actually fear that the corners and the white line glitch are not related. One might be software and the other hardware.

 

[ninecows]

another thing that really annoys me is that the refresh rate seems rather slow (I'm guessing that is it?). The retina resolution is sooooo smooth and lick'able, but once you move a window around the illusion false apart. It just stutters a lot. Movements looks more smooth on my iPhone 6s and on my work PC (Thinkpad T480-burning-hot-noisy-crap-laptop I think is the name of it)

 

[lolmiketaylor]

How does a "long term review" of a 2020 iMac w/ 5700XT get released by this prominent Mac Youtuber without a single mention of this issue? I say we bombard him with comments. How can he not know?

I saw they are having the glitch as well on 5700 machine.
Here the prove on left button side of screen around 0:55-0:57

And I remember seeing few more times here and there.

 

[PBG4 Dude]

Is it your opinion or some info you got from somewhere?

There was a beta supplemental update to 10.15.6 released on the developer site last week. Has to release to the public sometime.

 

[nkurtar]

There was a beta supplemental update to 10.15.6 released on the developer site last week. Has to release to the public sometime.

Yes that's right. Question is when?

 

[shywizard]

This is going to sound crazy, but I was just reading our chat forum and I saw a black horizontal line glitch. My background is dark, this chat forum window is white and it just flashed across the white area. Similar behavior to the horizontal white line in that it was fast, thin and disappeared. Only saw it once, but I saw it. Different than the white line issue, this black line was on top of the active window (this chat forum). No other programs are open and I wasn't moving the mouse (but the line was near the mouse).

I'm in the Default Resolution (which is the only place I've ever seen a glitch).

Hmmmm.

 

[PBG4 Dude]

Yes that's right. Question is when?

It didn’t fix the glitch issue for me. If Apple released it today, you’d still be waiting for a white line fix.

 

[Sheza]

No refurbished iMac's at all @ Apple, perhaps they aren't releasing them until the problem is fixed?

Lol, give it some time! The thing only just came out. They probably have a set refurb proccess they go through for each specific model and they will wait until they have a decent stock of them back before they launch refurbs for sale.

There maybe a macOS update after the event tonight. Hopefully it will have something to fix the glitch

I highly doubt that lol.

Oh and just because someone earlier asked: this is my second iMac (identical specs) to feature the glitch After I returned my first one due to a manufacturing fault (the bozo at the factory didn’t put the power adaptor in the sealed part of the polystyrene so the charging pins, which are sharper in the UK plug, flopped around and scuffed stuff up).

Oh also - regarding the 50/50 True Tone / slow sleep to wake, that sounds like the custom display controller Apple made to cope with the 5K resolution, no?

 

[jobinhosyntax]

2 days still no glitch, and the FaceTime corners are back to normal.

 

[torifile]

2 days still no glitch, and the FaceTime corners are back to normal.

Careful, you might get accused of lying or being blind.

 

[AZREOSpecialist]

Careful, you might get accused of lying or being blind.

Unless Apple started shipping 2020 iMacs with unreleased, revised firmware, all of them have the issue. One random person on the internet didn't just happen to be the only one to get a "good" iMac. Doesn't work that way.

 

[dspdoc]

Unless Apple started shipping 2020 iMacs with unreleased, revised firmware, all of them have the issue. One random person on the internet didn't just happen to be the only one to get a "good" iMac. Doesn't work that way.

This person just can’t resist the snark. Common sense alone tells us that this is not some one-off issue. Not sure why some people don’t get that if it were only happening on a few machines that it would indicate a HW issue which would be very bad news for us all and for Apple.

 

[AZREOSpecialist]

No FaceTime corner issues after rebooting into safe mode... There may also be no white line glitch in safe mode, but I couldn't wait long enough to find out.

 

[torifile]

This person just can’t resist the snark. Common sense alone tells us that this is not some one-off issue. Not sure why some people don’t get that if it were only happening on a few machines that it would indicate a HW issue which would be very bad news for us all and for Apple.

You mean to tell me you weren’t going to do that? It’s what you’ve done with others who have said the same thing. What’s different here?

So - Have you ever even used software? Bugs show up incosistently and intermittently *all the time*.

That said, put me down as someone who actually thinks this is affecting every 5700xt but I’m not going to tell someone who says they don’t have the problem that they’re wrong.

 

[Haplodepatrijn]

I must stop reading these posts. The more I read the more I get the feeling this is the worst iMac ever introduced. Right ?

 

[AZREOSpecialist]

I must stop reading these posts. The more I read the more I get the feeling this is the worst iMac ever introduced. Right ?

Not really. I don't have any issues because I don't use the default scaling/resolution. Even on my retina MacBook Pro I use a higher dpi scaled resolution. Apple's default scaling looks cartoonishly large to me. The more I can fit on my screen the better.

 

[anthony13]

I read that watchOS7 will notify us a few seconds ahead of each glitch so we can avert our eyes. *only available on series 6.

 

[torifile]

I must stop reading these posts. The more I read the more I get the feeling this is the worst iMac ever introduced. Right ?

Not even close. This is why I keep posting in this thread - people are giving the impression that this glitch is some sort of terrible experience that makes the computer unusable. It’s not that at all. It’s fleeting and so intermittent if you’re not looking at it, you wouldn’t even notice.

Don’t let the doomsayers and negative nancies overly influence you.

 

[RavenSystem]

Hi all,

Yesterday, I did following steps that seems to fix issue:
- Reset SMC.
- Reset NVRAM.
- Reset kernel extensions cache.
- Reset SMC again.
- Reset NVRAM again.

Step by step:
1. Shut down iMac.
2. Unplug iMac for 20 seconds.
3. Plug it, and wait 5 seconds.
4. Press and hold cmd + opt + p + r.
5. Turn on iMac.
6. Wait 15 seconds, and release keys.
7. Let iMac to boot entirely.
8. Log in, and open Terminal.
9. Exececute: sudo extcache -i /
10. Write your password, and wait until system promtp appears again.
11. Close Terminal and shut down iMac.
12. Repeat steps from 2 to 7.

I hope this helps.

 

[dspdoc]

DAY 42 WITH NO FIXES

 

[eflx]

Guys I wouldn't get too hopeful doing an SMC reset will do anything permanent. I'm on 5700 #2, and across 3 different systems all with SMC, NVRAM resets, full (fresh) install of Catalina etc. and it's only a matter of time it shows up again.

Also 100% reproducible if you have dual XDR displays. The graphics corruption is a permanent fixture.

 

[costica1234]

I'm on 5700 #2

5700 or 5700 XT?

 

[hotpotato123]

DAY 42 WITH NO FIXES

You're dealing with Apple here.

In spite of protests and petitions, Apple took 10 years to bring back an anti-glare screen in the form of its nano-texture screen.

In spite of protests, Apple took 5 years to go away from its Butterfly keyboard.

The characteristics of Apple knowing better, and not listening to its users -- because the proof is the tons of money they're making - is baked into its DNA from the Steve Jobs days.

 

[AZREOSpecialist]

Hi all,

Yesterday, I did following steps that seems to fix issue:
- Reset SMC.
- Reset NVRAM.
- Reset kernel extensions cache.
- Reset SMC again.
- Reset NVRAM again.

Step by step:
1. Shut down iMac.
2. Unplug iMac for 20 seconds.
3. Plug it, and wait 5 seconds.
4. Press and hold cmd + opt + p + r.
5. Turn on iMac.
6. Wait 15 seconds, and release keys.
7. Let iMac to boot entirely.
8. Log in, and open Terminal.
9. Exececute: sudo extcache -i /
10. Write your password, and wait until system promtp appears again.
11. Close Terminal and shut down iMac.
12. Repeat steps from 2 to 7.

I hope this helps.

Doesn't work, I just tried.

 

[Hechicero]

This is going to sound crazy, but I was just reading our chat forum and I saw a black horizontal line glitch. My background is dark, this chat forum window is white and it just flashed across the white area. Similar behavior to the horizontal white line in that it was fast, thin and disappeared. Only saw it once, but I saw it. Different than the white line issue, this black line was on top of the active window (this chat forum). No other programs are open and I wasn't moving the mouse (but the line was near the mouse).

I'm in the Default Resolution (which is the only place I've ever seen a glitch).

Hmmmm.

I believe I have had this happen before also. I mentioned a black line glitch a few days ago but no one else had seen it so thought maybe it was a just an afterimage from having caught the white glitch in my eye. But I feeL like I’ve seen it several times over video in particular while streaming mostly in dark mode (But that could just been that I happen to watch in evening/night time).