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On systems with multiple GPUs there can be uncertainty which GPU is the primary one used to drive the display at bootup. In some desktop environments this can lead to increased power consumption because secondary GPUs may be used for rendering and never go to a low power state. In order to disambiguate this add a new sysfs attribute 'boot_display' that uses the output of video_is_primary_device() to populate whether the PCI device was used for driving the display. Suggested-by: Manivannan Sadhasivam <mani@kernel.org> Acked-by: Manivannan Sadhasivam <mani@kernel.org> Link: https://gitlab.freedesktop.org/xorg/lib/libpciaccess/-/issues/23 Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de> Link: https://lore.kernel.org/r/20250811162606.587759-5-superm1@kernel.org Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
9 lines
354 B
Plaintext
9 lines
354 B
Plaintext
What: /sys/class/drm/.../boot_display
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Date: January 2026
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Contact: Linux DRI developers <dri-devel@vger.kernel.org>
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Description:
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This file indicates that displays connected to the device were
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used to display the boot sequence. If a display connected to
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the device was used to display the boot sequence the file will
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be present and contain "1".
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