[DragonFlyBSD - Bug #3388] i915 - drm.i915.enable_psr=1 freezes system

[bugtracker-admin at leaf.dragonflybsd.org]

Issue #3388 has been updated by mneumann.


There seems to be others having similar problems: https://www.reddit.com/r/ChromeOSFlex/comments/zcmpqp/adding_i915enable_psr0_to_kernel_options/

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Bug #3388: i915 - drm.i915.enable_psr=1 freezes system
http://bugs.dragonflybsd.org/issues/3388#change-14615

* Author: mneumann
* Status: New
* Priority: Normal
* Target version: 6.6
* Start date: 2025-12-01
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This happens as soon as I "kldload i915" and few seconds later the system is frozen (on the terminal) - no keyboard input possible anymore. Setting drm.i915.enable_psr=0 doesn't run into these issues.

Maybe we should mention on the man page that this can lead to stalls unless we are able to fix it :).
Also I noticed, while reading the man page, that sysctl "hw.dri.vblank_offdelay" does not exist, it is commented out in the code.

This is my graphics card:

vgapci0 at pci0:0:2:0:	class=0x030000 card=0x833810f7 chip=0x59178086 rev=0x07 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'UHD Graphics 620'
    class      = display
    subclass   = VGA

My DragonFly version is a very recent kernel/world build:

DragonFly letsnote.localnet 6.5-DEVELOPMENT DragonFly v6.5.0.1174.gf571e-DEVELOPMENT #13: Thu Nov 27 01:18:43 CET 2025     mneumann at letsnote.localnet:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64



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