https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209727
Bug ID: 209727
Summary: Panic in i915kms on power mode change
Product: Base System
Version: 11.0-CURRENT
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
CC: [email protected]
Created attachment 170587
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=170587&action=edit
Picture of the panic
While testing the freebsd-base-graphics/drm-next-4.6 branch with a Haswell (HD
4400) GPU laptop, changing the power mode (plugging or unplugging the power
cord) leads to instant panic, while with the drm-next-3.9 branch, switching
AC/battery modifies backlight value up and down without issues.
To reproduce:
# kldload drm2
# sysctl dev.drm.skip_ddb=1
# kldload i915kms
[plug / unplug the power cord (the result is exactly the same)]
panic: IMPLEMENT ME
…then the backtrace (attached image).
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