Bug #3388
open
i915 - drm.i915.enable_psr=1 freezes system
0%
Description
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@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@letsnote.localnet:/usr/obj/usr/src/sys/X86_64_GENERIC x86_64
Updated by mneumann 6 days ago
Maybe this patch could help: https://patchwork.freedesktop.org/patch/319173/?series=63774&rev=4
See also https://lkml.org/lkml/2019/8/8/925
There seems to be others having similar problems: