So after being on Wayland with the kernel option set, I can confirm that it solves the issue. I didn't get a single freeze, even with video playback in multiple codecs.

Hi,

I ran four passes of Memtest and there was no error.

However, now that I searched for a similar issue without restricting results to video playback I've found this : https://discuss.kde.org/t/complete-system-framerate-drop-spontaneously-after-a-while-on-amd-on-wayland/28281 which describes exactly my issue and gives a potential workaround by using the kernel parameter amdgpu.dcdebugmask=0x10. It also links to a freedesktop gitlab issue where many people seem to have this problem and have provided various reports.
I've added the kernel argument to grub, I'll report back here to confirm whether it fixes the issue.

Thanks

Dear Leonito,

please can you follow this guide to rule out possible faulty memory issues?

https://slimbook.com/en/blog/guides-2/post/rule-out-ram-failure-error-with-memtest86-356

Let us know if it passes completely the tests.

My best regards.

Dear Leonito,

please can you confirm with GUI session you are using?

you can know by running this command:

echo $XDG_SESSION_TYPE

if you are not using X11 , please try switching to it:

1. Log out of your session.

2. At the login screen (GDM):

   • Click your username.

   • Before entering your password, click the gear icon (⚙️) in the bottom right.

   • Select "Ubuntu on Xorg" (or "GNOME on Xorg").

   • Enter your password and log in.

This change persists only for your session — you can repeat it at login.

Once you are in X11, please tell us if it still freezes with firefox and youtube and perform this:

sudo perf record -g -a

then run:

sudo perf report

tell us what results it returns to you.

Does this only happen with Firefox or is it also with chromium browsers?

Please advise.

FYI I had the same issue 1 week ago whatching a youtube video. 1 processor was at 100% but top didn't show any process with high consume. Laptop was totally unusable and slow. I had to reboot. Sinche then no more issue. No idea how to replicate.

Hi,

So the issue has happened again, except this time there was nothing playing in Firefox (I think it wasn't even the focused window). It was on a wayland session. The only "heavy" thing I was running was docker desktop, but even after killing every docker process the system remained frozen and only a full reboot restored it to a usable state.
During the crash I ran perf record and report again, here are the results : https://imgur.com/a/NCW0Zh6 and https://drive.google.com/file/d/1cAm4Nguo0LxbB2-1MMWUIBh4JtK15Nnz/view?usp=sharing (this is only the processes above 0.5% CPU and even then it's almost 1MB large)

Thanks

Dear Leonito,

on the official Mozilla bugtracker:

https://bugzilla.mozilla.org/buglist.cgi?quicksearch=youtube

If you want to issue your case on there, you can.

Thank you for your swift response and attention.

My best regards.

I’m actually already using the deb package from the Mozilla PPA.

Have you seen those reports on more general forums/bug trackers or just here ?

thanks for your help.

Dear Leonito,

thank you for providing the proof in both formats,

there have been some reports of YouTube related issues with Firefox on Wayland, 

make sure you have the latest version of Firefox and the Mozilla Debian Package version instead of the flatpak one.

My best regards.

Thank you for your answer.

Sorry, I forgot to mention that I'm on Wayland !
After switching to X11, it seems more stable though I haven't had that much time to test so I'll report back if anything changes.

I ran perf record for a few minutes while playing video (youtube and twitch) but I'm not really sure how to share the report, I can only get so much in a screenshot (https://imgur.com/a/tosYmFg) and running perf report > perf.txt gives me a huge, very hard to read file. (first 2k lines here : https://pastebin.com/39XhBXvu)
Should I also try to run it while a freeze is happening in ?

I haven't tested on any other browser as I only use firefox, but I'll try to test that as well.