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I915KMS(4)	      DragonFly Kernel Interfaces Manual	    I915KMS(4)


NAME

     i915kms -- Driver for Intel i915 family integrated graphics chipsets


DESCRIPTION

     The i915kms driver provides support for integrated graphics chips by
     Intel.  Please refer the Loader Tunables section in syscons(4) for more
     information about how to make the console work with i915kms.


LOADER TUNABLES

     Tunables can be set at the loader(8) prompt before booting the kernel or
     stored in loader.conf(5).

     drm.i915.disable_aux_irq
	     When non-zero, disable interrupt usage for DisplayPort AUX chan-
	     nel.  This option doesn't affect GPU models older than Generation
	     5 (Ironlake).  Can be used as a workaround in cases where Dis-
	     playPort panel initialization is unreliable, which often leaves a
	     blank screen after the i915kms module was loaded.
	     1 = don't use AUX IRQ, 0 = auto (default).

     drm.i915.enable_psr
	     Enable PSR (panel self refresh), only relevant for Haswell and
	     Broadwell CPUs.  1 = enable, 0 = disable (default).  To maximize
	     PSR usage, it can be beneficial to set hw.dri.vblank_offdelay
	     (see drm(4)) to a sufficiently low value (or -1), to minimize
	     vblank interrupt activity.

     drm.i915.enable_execlists
	     Override execlists usage on Broadwell IGPs (no effect on other
	     IGP models).  Disabling execlists reverts to legacy ringbuffer
	     mode.  -1 = auto (default), 0 = disable, 1 = enable


SYSCTL VARIABLES

     If display backlight level can be controlled by the GPU (which is often
     the case in notebooks), the sysctl hw.backlight_level can be used to
     adjust the backlight level.  Permitted values are from 0 to the value of
     hw.backlight_max.


SEE ALSO

     drm(4), syscons(4)


HISTORY

     The i915kms driver was first available for Linux.

DragonFly 5.5		       October 27, 2015 		 DragonFly 5.5

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