* Match display backlight candidates against real globs
[[ ]] does not do pathname expansion, so amdgpu_bl* and acpi_video* only
ever tested for files with a literal asterisk in the name. Every machine
without intel_backlight silently fell through to the alphabetical first
entry, which picks acpi_video0 over amdgpu_bl0.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
* Use the gmux backlight instead of the Touch Bar on T2 Macs
/sys/class/backlight on a T2 Mac holds appletb_backlight and
gmux_backlight. Neither was a candidate, so the alphabetical fallback
picked the Touch Bar and brightness keys dimmed it instead of the
display. Add gmux_backlight and never fall back to the Touch Bar, which
is not a display panel on any Mac.
gmux ranks above the GPU backlights because apple-gmux only registers
its device when the kernel has already selected it for the machine, and
on dual-GPU Macs the GPU's own PWM stops driving the panel as soon as
that GPU suspends.
Fixes#6558
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
