Created attachment 11815 [details]
journalctl -b -1 output on affected system.
On MLO forums, several users reported systems hang with newest kernel-desktop image but 5.6 series linux kernel works fine on their hardware.
Full discussion here: https://www.mageialinux-online.org/forum/topic-27844-2+noyau-5-7-14-7-mga7-ne-demarre-pas.php
kernel: i915 0000:00:02.0: GPU HANG: ecode 7:1:8edcfc79, in gnome-shell 
kernel: GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
kernel: Please file a _new_ bug report at https://gitlab.freedesktop.org/drm/intel/issues/new.
kernel: Please see https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs for details.
kernel: drm/i915 developers can then reassign to the right component if it's not a kernel issue.
kernel: The GPU crash dump is required to analyze GPU hangs, so please always attach it.
kernel: GPU crash dump saved to /sys/class/drm/card0/error
kernel: i915 0000:00:02.0: Resetting chip for stopped heartbeat on rcs0
kernel: i915 0000:00:02.0: gnome-shell context reset due to GPU hang
Assigning to Kernel and Drivers Maintainers.
i915 drivers hangs on kernel-desktop-5.7.14-7 with recent Intel chips (CPU0: Intel(R) Pentium(R) CPU G3250T @ 2.80GHz) =>
i915 drivers hangs on kernel-desktop-5.7.14-7 with some Intel chips (CPU0: Intel(R) Pentium(R) CPU G3250T @ 2.80GHz)
https://gitlab.freedesktop.org/drm/intel/-/issues/2024 not yet solved.
My system is affected, too.
lspcidrake | grep VGA
Card:Intel 810 and later: Intel Corporation|Xeon E3-1200 v3 Processor Integrated Graphics Controller [DISPLAY_VGA] (rev: 06)
Seems there is a patch:
According to that issue thread several chips are affected, and also kernel 5.9 is affected and that patch fixed it for a 5.9 user.
Thus setting to cauldron despite no Mageia cauldron user reported it yet. - with mga7too of course.
i915 drivers hangs on kernel-desktop-5.7.14-7 with some Intel chips (CPU0: Intel(R) Pentium(R) CPU G3250T @ 2.80GHz) =>
i915 drivers hangs on kernel >= 5.7 with some Intel chips
Bug can be corrected in i915_debugfs.c by set critical section whith a mutex.
You could see that on kernel.org.
Chris Wilson correct the bug
fixed for me by kernel 5.9.12 from testing repository.
MGA7 is EOL since June 2021. Based on comment 5 the fix was introduced in kernel 5.9.x
Closing as FIXED.