CONFIG_DRM_MGAG200_IOBURST_WORKAROUND: Disable buffer caching

General informations

The Linux kernel configuration item CONFIG_DRM_MGAG200_IOBURST_WORKAROUND:

• prompt: Disable buffer caching
• type: bool
• depends on: CONFIG_DRM_MGAG200 && CONFIG_PREEMPT_RT && CONFIG_X86
• defined in drivers/gpu/drm/mgag200/Kconfig
• found in Linux kernels: 6.9–6.10

Help text

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.

Hardware

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The data is retrived from:

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• Linux Kernel Driver DataBase (LKDDb)

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