Update: Thanks to @jeff250 it seems like we narrowed the issue to kernel config changes between 6.6 and 6.8 in Ubuntu kernels.
Unfortunately, proper fix is still not available but we have a working workaround (intel_iommu=igfx_off).
More details can be found at upstream bug report: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/11504
Update:
Thanks to @jeff250 it seems like we narrowed the issue to kernel config changes between 6.6 and 6.8 in Ubuntu kernels.
Unfortunately, proper fix is still not available but we have a working workaround (intel_ iommu=igfx_ off).
More details can be found at upstream bug report: https:/ /gitlab. freedesktop. org/drm/ i915/kernel/ -/issues/ 11504