amd_x3d_mode defaulted to frequency, so the scheduler preferred the
non-V-cache CCD. kuhy chose cache: games prefer CPUs 0-5,12-17; background
jobs are already pinned to 6-11,18-23.
A udev rule matches DRIVER amd_x3d_vcache on add (boot coldplug) and bind
(any rebind), so it hard-codes no device name and survives a rebind,
unlike a tmpfiles w line. fixes/fix_amd_x3d_vcache.sh installs it, fires
a synthetic bind event and checks the mode ends on cache. Same layout as
fix_webcam_c270.sh, with a bats test.
Host: mode frequency -> cache, prefcore ranking now favours 0-5,12-17.
vmbox has no X3D device: only the install step was proven there.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WzxdWYWDKuhbBAoNETfoB9
