Ubuntu kernel update cripples graphics on AMD GPUs
AMD GPUs with IOMMU enabled face null pointer dereference, causing black screens on boot for Picasso/Raven 2 GPUs. A fix is available by reverting a problematic patch, impacting Ubuntu users.
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AMD GPUs with the IOMMU enabled are experiencing a null pointer dereference issue, resulting in a black screen during boot on systems with AMD Picasso/Raven 2 GPUs. The bug affects multiple users and has been reported on Ubuntu. A fix has been released by reverting a problematic patch that caused the regression. Users can apply a workaround by setting "nomodeset" or "amd_iommu=off" in the GRUB_CMDLINE_LINUX_DEFAULT. The impact of a regression is high, potentially leading to blank displays. The bug has been acknowledged and confirmed by multiple users, with reports of successful booting using older kernel versions. The fix involves reverting the patch that caused the issue in the first place. Additional reports and affected systems include AMD Ryzen processors with Radeon Vega graphics running Ubuntu and Kubuntu versions.
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