iMac 2020, 5700XT - graphical glitch?

[opeechee]

Hey guys, glad to see the line has gotten fixed in this patch. I'm debating ordering the 8 core 5700 XT. In the last few pages it seems users were experiencing resets when pushing the GPU? I'm a musician and also a streamer and was hoping to use the 5700XT to stream on twitch, which is very CPU and GPU intensive.

Just wondering if the machine resetting is a common issue?

 

[NLLV]

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.

OH for the love of Pete.

You're jumping to some pretty big conclusions here.

Modern day CPU's are made to have different clock speeds at different times and use conditions.

Why would the cpu run at its near max when you just power the machine on and have no load.

 

[rkuo]

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.

I see new entries for both iMac 2020 models in AGPM in 10.15.7, although they don't seem to do much except enable AGDC and some fairly bog standard min/max power states. But sometimes these new models ship with interim updates that aren't public, so it's not quite clear to me if these are really new or not.

 

[PieTunes]

For a few weeks now, I've been using the next scaled up resolution (2880x1620) from Default because of the white line glitch. Never saw it in the higher resolution. Though I prefer the Default at 2560x1440, I was willing to tradeoff the slightly smaller fonts and icons etc. to avoid having to see the glitch hopefully until a fix came out.

And it looks like that fix came out today. I was oddly enough at the Apple Store returning something when I saw the front page news on MacRumors on my phone about the macOS update. As soon as I got home I bumped my resolution back to Default and within 30 seconds, I saw the white flash on the right half of the screen. I then installed the update and have been using it ever since.

Going on about 10 hours of near continuous use and not one glitch. Praise be! It sucks this had to happen to begin with but I'm glad Apple appears to have resolved it.

 

[tommiart]

It’s software. My Floppy just turned into a solid state

 

[solymir]

Hi everyone,
As a fellow mac user I'm stalking this forum/thread for a long time. I ordered an iMac 2020 with a heavy heart while reading this thread, knowingly about this software defect, until this morning Catalina greeted me with the following message:

macOS Catalina 10.15.7 provides important security updates and bug fixes for your Mac.

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

Haleluja.

P.S. The corner issue I can swear I saw it once on my 5700XT eGPU, on Mail app. Never again after that. Is there any specific way to repro?

P.P.S. Ah, I see the patch was already there for ~24h. Excuse my enthusiasm then, I was extremely happy, even though I'm not affected - there's still some 3 weeks until I have it. I have a suspicion that our local distributor (iStyle) didn't want to sell any iMac 2020 until ~2 weeks ago, when dev 10.15.7 was announced... Even then, no mail, no banner on site, nothing, very hush-hush... Coincidence?

 

[Paul Cordingley]

On my Mac all day. I’ve gone from seeing this glitch 20-30 times in a day to ... zero. It’s fixed.

 

[nfriedman]

Hi everyone,
As a fellow mac user I'm stalking this forum/thread for a long time. I ordered an iMac 2020 with a heavy heart while reading this thread, knowingly about this software defect, until this morning Catalina greeted me with the following message:



Haleluja.

P.S. The corner issue I can swear I saw it once on my 5700XT eGPU, on Mail app. Never again after that.

P.P.S. Ah, I see the patch was already seen. Excuse my enthusiasm then, I was extremely happy, even though I'm not affected - there's still some 3 weeks until I have it. I have a suspicion that our local distributor (iStyle) didn't want to sell any iMac 2020 until ~2 weeks ago, when beta for 10.15.7 was announced... Coincidence?

Can absolutely relate to this. I pulled the trigger at the end of August, and ever since i came across this thread i was returning back, multiple times a day. The idea of getting a "flawed" iMac when coming from an otherwise excelent MBP 15 2015 was just sour.

I was also kind of relieved because of the mostly positive experiences of many iMac users, describing a lifespan and good usage experience for many years. The fact that you can find many 5 or more year old used iMac's strengthens this theory.
And since it is such a "dated" and "proven" design, i assumed that Apple did something good here and finally ordered one for my professional use too.

But here it is, the fix finally came and i am as happy as any owner/ future owner could be. Fingers crossed and waiting for the reports from this thread!

Since you mentioned iStyle, are you by any chance from Slovenia then? Because that's the name of the shop where i ordered it from too.

 

[solymir]

Since you mentioned iStyle, are you by any chance from Slovenia then? Because that's the name of the shop where i ordered it from too.

No, Romania. I looked into other iStyle shops and they had it - in Romania, crickets. Maybe they seen the number of returns and said to other branches "don't put on sale yet". Other resellers had it, but I don't trust their warranties for a 5000$ hardware.
Took me a while to understand what you meant - I thought you were returning the iMac itself multiple times a day...

 

[nfriedman]

No, Romania. I looked into other iStyle shops and they had it - in Romania, crickets. Maybe they seen the number of returns and said to other branches "don't put on sale yet". Other resellers had it, but I don't trust their warranties for a 5000$ hardware.

Ah yes, us chosen ones from the Balkan peninsula. Since we don't have an official store here us Slovenia either ( and thus loose much of the benefits that many other Apple "civilized" countries have) i ordered it through the iStyle branch store even before they like published it on their site.

They said to me then that we get our Apple products from Hungary. We don't even have our own storage facility for Macs. What a market that is.

But hey, then again, after going through all the hassles of finally getting such a device, maybe we in term appreciate it more in the end, right?

 

[solymir]

some fairly bog standard min/max power states.

I think you are correct, somewhere. True, I don't have an iMac yet, but after this update my eGPU is turning on its fans more often and at a higher rpm. They never did that unless I was gaming and sometimes during Lightroom/Revit. This is peculiar. Did they changed something across all Navi cards, regardless of how they are attached? If that's the case, the battery life of Navi based MacBooks won't be affected?

 

[madmin]

I've been following this thread from the start and would like to thank and congratulate everybody here for doing a great job on documenting this issue, raising awareness and finally getting the fix from Apple.

 

[Clifford Andrew]

I've been following this thread from the start and would like to thank and congratulate everybody here for doing a great job on documenting this issue, raising awareness and finally getting the fix from Apple.

Indeed—Many thanks to all! What a relief, but please remain vigilant!

 

[kkh]

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

I'm strumming my pain with your fingers? Wait. No.

It's just there, flickering at me. I'm probably more OCD than most but I can't handle it. Glad that the white lines are gone (or so it seems) but the flickery corners are just silly. Especially for a company that has spent insane amounts of time obsessing over the corner radius of multiple products. Is that an indicator of a bigger underlying issue? Probably not. I was more concerned about the white lines being an indicator of a bigger issue. But it's still a crack in the windshield.

 

[kkh]

Agreed. You have to look for it with a magnifying glass.

Let me know if you need an ophthalmologist referral. ?

 

[fokmik]

I've been following this thread from the start and would like to thank and congratulate everybody here for doing a great job on documenting this issue, raising awareness and finally getting the fix from Apple.

Its kind of sad that the in-doors QA transformed into customers , 0 pay and 0 free testing devices , QA for apple products are made on the users own things
Now the customers are the testers , and not just for apple products but for almost everything

 

[kkh]

Hey Apple, still waiting for 10.15.8. Thanks.

 

[shywizard]

Now that the software patch is out, should we reset the Poll?

see if anyone is experiencing the glitch after updating?

 

[Clifford Andrew]

Now that the software patch is out, should we reset the Poll?

see if anyone is experiencing the glitch after updating?

Sounds like a good idea to me!

 

[Haplodepatrijn]

I wonder, if we order now, would this patch already be applied by Apple or will we still have to do it ourselves ? Iow, does the software version always remains the same (first launch version) no matter when the iMac is ordered ?

 

[Donnation]

I wonder, if we order now, would this patch already be applied by Apple or will we still have to do it ourselves ? Iow, does the software version always remains the same (first launch version) no matter when the iMac is ordered ?

You'll most likely have to update it when you receive it. It doesn't always remain the same, but the majority of them will be loaded with the OS before the software patch.

 

[shywizard]

When Apple releases the next Big Sur beta, does this glitch patch get put into that as well? Not sure if Apple patches to both OS as they find/fix stuff.

 

[DavePorter33765]

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.

I reran several benchmarks last night after the patch was applied; I ran Geekbench, Cinebench r20 and Unigien Heaven. The performance values I got (CPU and GPU as appropriate) were about the same pre and post patch here. What did appear to be different is the fan speeds ramped-up sooner and faster then they did pre patch. It appears that the fan profile may have been modified. The good news is that the fan changes are slight and do not greatly increase overall noise pre vs post patch operation for the most part. To be honest, I was amazed that my new iMac was so much quieter than my 2015 iMac when running the exact same tasks given how much more powerful my new Mac is in both CPU and GPU performance.

 

[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.



View attachment 958845 View attachment 958846 View attachment 958847

UPDATE:

It seem's that is a localization bug in Novabench. Look at those capture screen.
The first one is for my OS set to Native English, the second one is for French localization. And the performance reported are equivalent. Mystery solved. (Or, may be the French is a more complex language than English. Et voilà... mouhahaaaa ?)
*By the way, white line problem is solved for me since the last system update.*

 

[CL14715]

I have a new glitch after the update. I noticed after sleeping for a while when I wake up my iMac there's a white tint over the screen that goes away after a few seconds and it returns to its normal saturated picture. It's almost like the brightness is out of wack. Anyone else?