ENUM DRM_DEBUG_CATEGORY(9)

✨ enum drm_debug_category(9) ✨

okay so welcome to the Kernel API Manual page for enum drm_debug_category — yes, the title is literally enum drm_debug_category(9). This is the DRM debug categories, and we're gonna get you fluent, bestie. 🎀

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💖 NAME 💖

enum drm_debug_category — The DRM debug categories. That's the name, that's the vibe. ✨

🌸 SYNOPSIS 🌸

       enum drm_debug_category {
           DRM_UT_CORE ,
           DRM_UT_DRIVER ,
           DRM_UT_KMS ,
           DRM_UT_PRIME ,
           DRM_UT_ATOMIC ,
           DRM_UT_VBL ,
           DRM_UT_STATE ,
           DRM_UT_LEASE ,
           DRM_UT_DP ,
           DRM_UT_DRMRES

       };

🎀 Constants 🎀

• DRM_UT_CORE — Used in the generic drm code: drm_ioctl.c, drm_mm.c, drm_memory.c, ... 👑
• DRM_UT_DRIVER — Used in the vendor specific part of the driver: i915, radeon, ... macro.
• DRM_UT_KMS — Used in the modesetting code.
• DRM_UT_PRIME — Used in the prime code.
• DRM_UT_ATOMIC — Used in the atomic code.
• DRM_UT_VBL — Used for verbose debug message in the vblank code.
• DRM_UT_STATE — Used for verbose atomic state debugging.
• DRM_UT_LEASE — Used in the lease code.
• DRM_UT_DP — Used in the DP code.
• DRM_UT_DRMRES — Used in the drm managed resources code.

💅 Description 💅

Each of the DRM debug logging macros use a specific category, and the logging is filtered by the drm.debug module parameter. This enum specifies the values for the interface. No cap. 🫶

Each DRM_DEBUG_<CATEGORY> macro logs to DRM_UT_<CATEGORY> category, except DRM_DEBUG logs to DRM_UT_CORE.

Enabling verbose debug messages is done through the drm.debug parameter, each category being enabled by a bit:

• drm.debug=0x1 will enable CORE messages
• drm.debug=0x2 will enable DRIVER messages
• drm.debug=0x3 will enable CORE and DRIVER messages
• (the source lists an empty bullet right here — keeping it 100% real, bestie)
• drm.debug=0x3ff will enable all messages 🔥

An interesting feature is that it's possible to enable verbose logging at run-time by echoing the debug value in its sysfs node:

         # echo 0xf > /sys/module/drm/parameters/debug

🔥 SEE ALSO 🔥

• Kernel file ./include/drm/drm_print.h print(9)
• struct drm_printer(9)
• drm_vprintf(9)
• drm_printf_indent(9)
• struct drm_print_iterator(9)
• drm_coredump_printer(9)
• drm_coredump_printer_is_full(9)
• drm_seq_file_printer(9)
• drm_info_printer(9)
• drm_dbg_printer(9)
• drm_err_printer(9)
• drm_line_printer(9)
• DRM_DEV_ERROR(9)
• DRM_DEV_ERROR_RATELIMITED(9)
• DRM_DEV_DEBUG(9)
• DRM_DEV_DEBUG_DRIVER(9)
• DRM_DEV_DEBUG_KMS(9)

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okay bye bestie 🫶 — source/version: ./include/drm; date: October 2026; page: enum drm_debug_category(9). That's the footer, but make it cute. 💖