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I915(4)               DragonFly Kernel Interfaces Manual               I915(4)


NAME

     i915 - Driver for Intel i915 family integrated graphics chipsets


DESCRIPTION

     The i915 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 i915.


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
             channel.  This option doesn't affect GPU models older than
             Generation 5 (Ironlake).  Can be used as a workaround in cases
             where DisplayPort panel initialization is unreliable, which often
             leaves a blank screen after the i915 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 i915 driver was first available for Linux.

DragonFly 5.7-DEVELOPMENT       October 9, 2019      DragonFly 5.7-DEVELOPMENT

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