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The Linux kernel configuration item CONFIG_DRM_MGAG200_IOBURST_WORKAROUND
:
CONFIG_DRM_MGAG200 && CONFIG_PREEMPT_RT && CONFIG_X86
Enable a workaround to avoid I/O bursts within the mgag200 driver at the expense of overall display performance. It restores the <v5.10 behavior, by mapping the framebuffer in system RAM as Write-Combining, and flushing the cache after each write. This is only useful on x86_64 if you want to run processes with deterministic latency. If unsure, say N.
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