system76-power exits in absence of smbios info

[ctr49]

system76-power seems to have a hard dependency on DMI information although that shouldn't be need to control power profiles.

I have a Macbook Pro (2023) with Gentoo (and Asahi modifications) - the platform (aarch64) does not necessarily provide SMBIOS/DMI information.

When the expected DMI information is not present, the daemon doesn't start:

# system76-power daemon
[INFO] Rescanning PCI bus
[ERROR] /proc/sys/kernel/nmi_watchdog: failed to set value: Permission denied (os error 13)
[WARN] Failed to set automatic graphics power: org.freedesktop.DBus.Error.Failed: does not have switchable graphics
No such file or directory (os error 2)

observing behaviour with strace:

openat(AT_FDCWD, "/sys/class/dmi/id/chassis_type", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
write(2, "[", 1[)                        = 1
write(2, "WARN", 4WARN)                     = 4
write(2, "] ", 2] )                       = 2
write(2, "Failed to set automatic graphics"..., 40Failed to set automatic graphics power: ) = 40
write(2, "org.freedesktop.DBus.Error.Faile"..., 33org.freedesktop.DBus.Error.Failed) = 33
write(2, ": ", 2: )                       = 2
write(2, "does not have switchable graphic"..., 33does not have switchable graphics) = 33
write(2, "\n", 1
)                       = 1
openat(AT_FDCWD, "/sys/class/dmi/id/sys_vendor", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
close(3)                                = 0
close(8)                                = 0
close(5)                                = 0
close(4)                                = 0
futex(0xaaab084059f8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
write(2, "No such file or directory", 25No such file or directory) = 25
write(2, " (os error ", 11 (os error )             = 11
write(2, "2", 12)                        = 1
write(2, ")", 1))                        = 1
write(2, "\n", 1
)                       = 1
sigaltstack({ss_sp=NULL, ss_flags=SS_DISABLE, ss_size=16384}, NULL) = 0
munmap(0xffffbd1f4000, 32768)           = 0
exit_group(1)                           = ?
+++ exited with 1 +++

[crawfxrd]

When the expected DMI information is not present

Well it should exist, because SMBIOS is required by firmware even on AArch64 (in particular: type 0, 1, and 3 that we tend to use to detect our hardware).