iMac 2020, 5700XT - graphical glitch?

[costica1234]

Glad to hear that the update fixes the white line glitch for all machines running 5700 XT.

That said, I have the 5700 (non-XT) version and it seems that the corner glitch is now happening on BOTH top corners on the latest 10.15.7 update. Very easy to reproduce in dark mode by dragging a window on a white background (see the attached video).

Does anyone remember if the corner glitch was also present on the top right before the .7 update?

 

[shywizard]

Just gonna throw this out there, but do you think Apple just changed the resolution by 1 pixel to make it go away?
So curious what was causing it in the first place.
I guess I should just be happy it's gone.

 

[MikeeVideo]

Here's my Novabench results:
#1: Mac OS X 10.15.6, just before the update
#2: Mac OS X 10.15.7 just after startup
#3: Mac OS X 10.15.7 after 30 minutes of heavy work with Logic, playing 30 tracks with multiple effect and modules.

Same results. But Why did I get 3.00 Ghz for the CPU ?!?? I don't know.

 

[costica1234]

That said, I have the 5700 (non-XT) version and it seems that the corner glitch is now happening on BOTH top corners on the latest 10.15.7 update. Very easy to reproduce in dark mode by dragging a window on a white background (see the attached video).

It looks like ticking either 'Increase contrast' or 'Reduce transparency' under Sys Prefs -> Accessibility -> Display -> Display fixes the corner issue. Not sure if this was mentioned before.

 

[Nermal]

Does anyone remember if the corner glitch was also present on the top right before the .7 update?

Sure was.

 

[costica1234]

Here's another interesting one regarding the corner glitch. It happens even when zooming in/out using CTRL + scroll up/down on the trackpad. This is demonstrated in the video below. Note that I'm not moving the window at all, just zooming in/out using the said accessibility feature.

 

[AZREOSpecialist]

Like hell! Apple did absolutely nothing to put peoples minds at rest about this issue. They never acknowledged it (until now), they incorrectly advised people to return machines and try another unit, and then every time people rang up to report the issue, they were told by Apple it’s the first time they’d ever heard of it!

Personally I think it’s absolutely disgraceful how Apple have handled it. I feel sorry for those who were wrong told to return machines.

All Apple had to do was put out a statement at the start, acknowledging the issue, and saying they were working on a fix - but they did nothing.

You seem to be expecting Apple to behave differently in this case than it has in the past. Several of us tried to tell others in the thread that it wasn't such a big deal and that it was most likely software. One flickering line a handful of times per day, often going hours without seeing any issues whatsoever, is simply not something over which I'm willing to return an otherwise excellent computer. Especially when there was an easy workaround that made the problem disappear (change scaling).

Even though I wasn't feeling particularly hopeful yesterday, I was willing to give Apple some time to figure it out. I'm glad I did.

 

[shywizard]

I assume more of you have installed this update by now.
Anyone seeing the White Horizontal Line?

 

[ADGrant]

I assume more of you have installed this update by now.
Anyone seeing the White Horizontal Line?

Not so far.

 

[NLLV]

Like hell! Apple did absolutely nothing to put peoples minds at rest about this issue. They never acknowledged it (until now), they incorrectly advised people to return machines and try another unit, and then every time people rang up to report the issue, they were told by Apple it’s the first time they’d ever heard of it!

Personally I think it’s absolutely disgraceful how Apple have handled it. I feel sorry for those who were wrong told to return machines.

All Apple had to do was put out a statement at the start, acknowledging the issue, and saying they were working on a fix - but they did nothing.

To be fair (and I'm new and of the mindset I just overpaid willingly for my new Mac they just delivered)...

I put off buying a Mac for a long time because I was always under the impression that when they break they break spectacularly and I was very worried about this so I'm not a fanboy I'm with someone who is considering having a machine that have to return when I get home and open it up today...

1. Public companies don't always address things. Stock prices matter more than us mere mortals.

Publicly acknowledging it would have hurt their sales tremendously and cause their stock to drop.

2. You called the world's largest to company and you expect everyone to be on the same page? I'm not making excuses merely pointing out that there's no way for them to convey a message that big to all of their Associates unless it's something that they go public with, and you can see above for why I think they did not go went public

 

[kkh]

"Addresses a graphic issue that may occur on ‌iMac‌ (Retina 5K, 27-inch, 2020) with Radeon Pro 5700 XT"

Alright. Issue. Not issues. But, a good start. Thank you, Apple.

So, the sharp corners persist. Earlier somebody asked if it was limited to Mail or just the top left corner. The answer is no. I saw it top left and top right. Possibly also bottom right. And it depends on the window type and transparency used in the title bar and tool bar components of the windows.

Interestingly, none of the AMD drivers were updated. They're still dated 7/7/20 8:04 PM with identical version numbering. Unless they were purposefully touched to match the previous dates. ?

This seems to imply that the white lines glitch was caused by something else entirely. Not the AMD drivers but something else. Maybe it was something to do with the mouse pointer as some of us suspected?

Have not seen the white lines thus far. Hopeful that if Apple was able to fix the more elusive issue, they will be able to fix the corners (more easily reproduced) also. Then again, while it's more easily reproduced maybe finding the actual cause is more difficult than the cause for the white lines?

 

[CL14715]

Well after the nightmare of downgrading back to Catalina I have finally installed the update. It definitely hasn't happened since then at the default resolution.

 

[shywizard]

"Addresses a graphic issue that may occur on ‌iMac‌ (Retina 5K, 27-inch, 2020) with Radeon Pro 5700 XT"

Alright. Issue. Not issues. But, a good start. Thank you, Apple.

So, the sharp corners persist. Earlier somebody asked if it was limited to Mail or just the top left corner. The answer is no. I saw it top left and top right. Possibly also bottom right. And it depends on the window type and transparency used in the title bar and tool bar components of the windows.

Interestingly, none of the AMD drivers were updated. They're still dated 7/7/20 8:04 PM with identical version numbering. Unless they were purposefully touched to match the previous dates. ?

This seems to imply that the white lines glitch was caused by something else entirely. Not the AMD drivers but something else. Maybe it was something to do with the mouse pointer as some of us suspected?

Have not seen the white lines thus far. Hopeful that if Apple was able to fix the more elusive issue, they will be able to fix the corners (more easily reproduced) also. Then again, while it's more easily reproduced maybe finding the actual cause is more difficult than the cause for the white lines?

The white line was a show stopper and forced people to return their Macs.
The corner glitch is minor, not even noticeable unless you're looking for it.
Would have thought they would address both issues, but happy they fixed the more obvious one.

 

[ADGrant]

Interestingly, none of the AMD drivers were updated. They're still dated 7/7/20 8:04 PM with identical version numbering. Unless they were purposefully touched to match the previous dates. ?

This seems to imply that the white lines glitch was caused by something else entirely. Not the AMD drivers but something else. Maybe it was something to do with the mouse pointer as some of us suspected?

That is interesting. So the fix was further up the stack. Perhaps in the Quartz 2D renderer?

 

[ADGrant]

The white line was a show stopper and forced people to return their Macs.

I don't think the white line was a show stopper for everyone and I certainly didn't feel forced to return my Mac. It was concerning though so I am happy they have apparently fixed the issue.

 

[kkh]

The corner glitch is minor, not even noticeable unless you're looking for it.

Disagree. It is very noticeable.

 

[kkh]

That is interesting. So the fix was further up the stack. Perhaps in the Quartz 2D renderer?

Must've been, yeah. Wondering if it was one particular bug or if there were/are multiple causes. I guess we'll find out if the lines return under any circumstances or if they're 100% gone.

 

[shywizard]

Disagree. It is very noticeable.

KKH, you and I have agreed on everything since page 4 of this thread.
You're killing me softly....

 

[wumpalumpa]

Here's my Novabench results:
#1: Mac OS X 10.15.6, just before the update
#2: Mac OS X 10.15.7 just after startup
#3: Mac OS X 10.15.7 after 30 minutes of heavy work with Logic, playing 30 tracks with multiple effect and modules.

Same results. But Why did I get 3.00 Ghz for the CPU ?!?? I don't know.

View attachment 958845 View attachment 958846 View attachment 958847

Is other people having same issue? CPU reporting less Ghz than what it should?

If that is happening to other people then those results would suggest apple underclocked chipsets trough software (I wrote about this being a possible solution in past posts)

They cannot advertise 3,6 GHz and only give 3,0GHz

if that is what is happening this could be one of the biggest Apple fails.

I do not really care because I do not own an iMac 2020 but as Mac user it annoys me.

 

[AZREOSpecialist]

The white line was a show stopper and forced people to return their Macs.

It wasn't, though. Have you actually experienced it for yourself? Nobody was forced to return anything. People had a simple choice: return it or wait for apple to come out with a fix. Seeing as our computers are all covered under a warranty through which Apple would address any hardware issues, holding on to the computer was a pretty safe bet.

The corner glitch is minor, not even noticeable unless you're looking for it.

Agreed. You have to look for it with a magnifying glass. I got better things to do.

 

[LGR]

Bravo Apple. I put my old machine up for sale.

 

[AZREOSpecialist]

My computer is just as fast as it should be. No problem with CPU reporting at correct speed in all benchmark applications. All stress tests shown in online videos (Maxtech, others) show great thermals and performance!

 

[shywizard]

It wasn't, though. Have you actually experienced it for yourself? Nobody was forced to return anything. People had a simple choice: return it or wait for apple to come out with a fix. Seeing as our computers are all covered under a warranty through which Apple would address any hardware issues, holding on to the computer was a pretty safe bet.

Agreed. You have to look for it with a magnifying glass. I got better things to do.

Maybe Show Stopper weren’t the right words. I totally agree, white line was a tiny blip.
What I meant was, some people were returning their iMacs because of the white line. It was a show stopper.
Nobody was returning because performance wasn’t good. Nobody was returning because of glitchy corner you could barely see. They were returning their iMacs because of the white line.

 

[Arrion7]

So glad for this community. I've had the problem and just received the returned iMac...

I ordered it the day it dropped. Noticed the lines right away. Worked with customer service, who knew nothing about the issue. After days of "do THIS and see if that will fix it" was advised to take it to a local repair shop, where they decided it was best to change out the logic board. After 2 weeks of that... I got the iMac back, situation was the same - Intermittent, Horizontal, Line-Glitch, Pixels Sucking, Thingys.

So after that headache, I was told to return it. After 2 weeks Finally got it back!... Oh wait.... Its STILL friggin HAPPENING!

Until I just updated it...! So far so good ?

I had made a video when it first happened to try to explain to them, see attached if you dig.

2020 iMac @ 3.6 10 Core i9, 1TB SSD, 64 OWC Ram, AMD 5700xt

 

[rkuo]

"Addresses a graphic issue that may occur on ‌iMac‌ (Retina 5K, 27-inch, 2020) with Radeon Pro 5700 XT"

Alright. Issue. Not issues. But, a good start. Thank you, Apple.

So, the sharp corners persist. Earlier somebody asked if it was limited to Mail or just the top left corner. The answer is no. I saw it top left and top right. Possibly also bottom right. And it depends on the window type and transparency used in the title bar and tool bar components of the windows.

Interestingly, none of the AMD drivers were updated. They're still dated 7/7/20 8:04 PM with identical version numbering. Unless they were purposefully touched to match the previous dates. ?

This seems to imply that the white lines glitch was caused by something else entirely. Not the AMD drivers but something else. Maybe it was something to do with the mouse pointer as some of us suspected?

Have not seen the white lines thus far. Hopeful that if Apple was able to fix the more elusive issue, they will be able to fix the corners (more easily reproduced) also. Then again, while it's more easily reproduced maybe finding the actual cause is more difficult than the cause for the white lines?

I still suspect power saving configuration for the GPU was too aggressive and that they probably backed it off in AGPM somewhere without having to update the drivers. Plugging in external monitors, which appeared to fix the problem, usually spins up the GPU more, so it wouldn’t be transitioning into very low power states.