Crash when getting brightness/contrast/volume

[dimaryaz]

Everything actually works - but, after it prints out the brightness and contrast, it crashes. (Does not print out volume, but my monitor has no speakers.)

Example:

$ monitorctl b 80
$ RUST_BACKTRACE=full monitorctl b -g
80
thread '<unnamed>' panicked at 'Unable to get brightness', src/monitor.rs:74:60
stack backtrace:
   0:     0x5615405066b0 - std::backtrace_rs::backtrace::libunwind::trace::hbb65baf894db8c68
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x5615405066b0 - std::backtrace_rs::backtrace::trace_unsynchronized::h0e03ba5e809c4954
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x5615405066b0 - std::sys_common::backtrace::_print_fmt::h041403450149d7c0
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x5615405066b0 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h243893eacc816eeb
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x5615404c6a7e - core::fmt::write::hff5a41730d602293
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/core/src/fmt/mod.rs:1213:17
   5:     0x5615404e6094 - std::io::Write::write_fmt::h7d17a7d392206491
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/std/src/io/mod.rs:1682:15
   6:     0x561540507d5f - std::sys_common::backtrace::_print::h1af2dbf04474a957
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x561540507d5f - std::sys_common::backtrace::print::h103649e0239208bd
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x56154050795f - std::panicking::default_hook::{{closure}}::hc67713d71c172682
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/std/src/panicking.rs:267:22
   9:     0x5615405089ed - std::panicking::default_hook::h27620c482a8179d2
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/std/src/panicking.rs:286:9
  10:     0x5615405089ed - std::panicking::rust_panic_with_hook::ha6ce20655fba4305
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/std/src/panicking.rs:688:13
  11:     0x5615405084c4 - std::panicking::begin_panic_handler::{{closure}}::h04e79fe6d651776e
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/std/src/panicking.rs:579:13
  12:     0x56154050842c - std::sys_common::backtrace::__rust_end_short_backtrace::h054638280f769b77
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/std/src/sys_common/backtrace.rs:137:18
  13:     0x561540508401 - rust_begin_unwind
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/std/src/panicking.rs:575:5
  14:     0x56154048b7a2 - core::panicking::panic_fmt::hdb49e6aa04f4240c
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/core/src/panicking.rs:64:14
  15:     0x5615404c73d0 - core::panicking::panic_display::h98cb762452b21538
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/core/src/panicking.rs:147:5
  16:     0x5615404c737b - core::panicking::panic_str::h805631c5cd71d0a0
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/core/src/panicking.rs:131:5
  17:     0x56154048ba56 - core::option::expect_failed::hb5bb9a600efe2a86
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/core/src/option.rs:1924:5
  18:     0x56154048e2ff - std::sys_common::backtrace::__rust_begin_short_backtrace::h1763cd96170b12fe
  19:     0x5615404d6105 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h9ed2923132026fb6
  20:     0x561540509195 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::ha3a3557431c34d1b
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/alloc/src/boxed.rs:1988:9
  21:     0x561540509195 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h135ae68a2b49a849
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/alloc/src/boxed.rs:1988:9
  22:     0x561540509195 - std::sys::unix::thread::Thread::new::thread_start::h1b19f9317554c1be
                               at /builddir/build/BUILD/rustc-1.68.2-src/library/std/src/sys/unix/thread.rs:108:17
  23:     0x7ff1ae656c57 - start_thread
  24:     0x7ff1ae6dca70 - __clone3
  25:                0x0 - <unknown>
Aborted (core dumped)

It set the brightness to 80, then printed out 80, but then crashed.