[NixOS] ERROR: failed to read battery BAT1 thresholds: CalledProcessError(1, ['cat', '/sys/class/power_supply/BAT1/charge_start_threshold'])

### Summary

I'm encountering an error with battery threshold settings on my Lenovo Yoga Slim 7 Pro X (14IAH7). The system fails to read battery threshold values, resulting in the error below.

### Laptop Model

Lenovo Yoga Slim 7 Pro X (14IAH7)

### Error output:

```text
cat: /sys/class/power_supply/BAT1/charge_start_threshold: No such file or directory
ERROR: failed to read battery BAT1 thresholds: CalledProcessError(1, ['cat', '/sys/class/power_supply/BAT1/charge_start_threshold'])
```

### System information:

```text
-------------------------------- Battery Info ---------------------------------

battery count = 1
cat: /sys/class/power_supply/BAT1/charge_start_threshold: No such file or directory
ERROR: failed to read battery BAT1 thresholds: CalledProcessError(1, ['cat', '/sys/class/power_supply/BAT1/charge_start_threshold'])

-------------------------------------------------------------------------------

Linux distro: NixOS 24.11 Vicuna
Linux kernel: 6.11.7
Processor: 12th Gen Intel(R) Core(TM) i7-12700H
Cores: 20
Architecture: x86_64
Driver: intel_pstate

------------------------------ Current CPU stats ------------------------------

CPU max frequency: 2300 MHz
CPU min frequency: 400 MHz

Core Usage Temperature Frequency
CPU0 1.0% 45 °C 1131 MHz
CPU1 3.0% 45 °C 400 MHz
CPU2 1.0% 46 °C 400 MHz
CPU3 0.0% 46 °C 400 MHz
CPU4 8.0% 44 °C 463 MHz
CPU5 0.0% 44 °C 400 MHz
CPU6 2.0% 45 °C 429 MHz
CPU7 0.0% 45 °C 400 MHz
CPU8 1.0% 43 °C 400 MHz
CPU9 0.0% 43 °C 400 MHz
CPU10 3.0% 42 °C 701 MHz
CPU11 0.0% 42 °C 400 MHz
CPU12 2.0% 45 °C 598 MHz
CPU13 4.0% 45 °C 603 MHz
CPU14 3.0% 45 °C 1110 MHz
CPU15 3.0% 45 °C 400 MHz
CPU16 1.0% 44 °C 400 MHz
CPU17 9.1% 44 °C 400 MHz
CPU18 5.9% 45 °C 554 MHz
CPU19 2.0% 45 °C 628 MHz

auto-cpufreq version: 2.4.0

Python: 3.12.7
psutil package: 6.0.0
platform package: 1.0.8
click package: 8.1.7
distro package: 1.9.0

Computer type: /nix/store/mm0pa3z7kk6jh1i9rkxqxjqmd8h1qpxf-bash-5.2p37/bin/sh: line 1: dmidecode: command not found
Battery is: discharging

auto-cpufreq system resource consumption:
cpu usage: 0.0 %
memory use: 0.23 %

Total CPU usage: 0.8 %
Total system load: 0.63
Average temp. of all cores: 44.40 °C

Currently using: powersave governor
Currently turbo boost is: off

-------------------------------------------------------------------------------
```

### Config

```nix
{
programs.auto-cpufreq = {
enable = true;
settings = {
charger = {
governor = "performance";
energy_performance_preference = "performance";
turbo = "auto";
};
battery = {
governor = "powersave";
energy_performance_preference = "power";
turbo = "auto";
enable_thresholds = true;
ideapad_laptop_conservation_mode = true;
};
};
};
}
```

### Kernel Modules

```text
Module Size Used by
snd_seq_dummy 12288 0
snd_hrtimer 12288 1
snd_seq 110592 7 snd_seq_dummy
snd_seq_device 16384 1 snd_seq
rfcomm 102400 16
af_packet 65536 2
ccm 20480 9
algif_aead 12288 0
crypto_null 16384 1 algif_aead
des3_ede_x86_64 45056 0
cbc 12288 0
des_generic 12288 0
libdes 20480 2 des_generic,des3_ede_x86_64
md4 12288 0
xt_conntrack 12288 2
nf_conntrack 204800 1 xt_conntrack
cmac 12288 3
nf_defrag_ipv6 24576 1 nf_conntrack
algif_hash 12288 1
nf_defrag_ipv4 12288 1 nf_conntrack
algif_skcipher 12288 1
af_alg 32768 7 algif_hash,algif_skcipher,algif_aead
bnep 28672 2
ip6t_rpfilter 12288 1
ipt_rpfilter 12288 1
xt_pkttype 12288 2
xt_LOG 16384 2
nf_log_syslog 24576 2
xt_tcpudp 16384 3
nft_compat 24576 11
nf_tables 380928 153 nft_compat
sch_fq_codel 20480 1
msr 12288 0
loop 45056 0
tun 69632 0
tap 32768 0
macvlan 36864 0
bridge 401408 0
stp 12288 1 bridge
llc 16384 2 bridge,stp
acpi_call 12288 0
snd_ctl_led 24576 0
snd_soc_skl_hda_dsp 24576 4
snd_soc_hdac_hdmi 45056 1 snd_soc_skl_hda_dsp
snd_soc_intel_hda_dsp_common 16384 1 snd_soc_skl_hda_dsp
snd_sof_probes 24576 0
snd_hda_codec_hdmi 98304 1
snd_hda_codec_realtek 212992 1
snd_hda_codec_generic 110592 1 snd_hda_codec_realtek
snd_hda_scodec_component 20480 1 snd_hda_codec_realtek
snd_soc_dmic 12288 1
snd_sof_pci_intel_tgl 16384 0
snd_sof_pci_intel_cnl 20480 1 snd_sof_pci_intel_tgl
snd_sof_intel_hda_generic 40960 2 snd_sof_pci_intel_tgl,snd_sof_pci_intel_cnl
soundwire_intel 81920 1 snd_sof_intel_hda_generic
soundwire_cadence 45056 1 soundwire_intel
mousedev 24576 0
joydev 24576 0
snd_sof_intel_hda_common 200704 3 snd_sof_intel_hda_generic,snd_sof_pci_intel_tgl,snd_sof_pci_intel_cnl
snd_soc_hdac_hda 28672 1 snd_sof_intel_hda_common
snd_sof_intel_hda_mlink 36864 3 soundwire_intel,snd_sof_intel_hda_common,snd_sof_intel_hda_generic
snd_sof_intel_hda 20480 2 snd_sof_intel_hda_common,snd_sof_intel_hda_generic
snd_sof_pci 24576 3 snd_sof_intel_hda_generic,snd_sof_pci_intel_tgl,snd_sof_pci_intel_cnl
snd_sof_xtensa_dsp 16384 1 snd_sof_intel_hda_generic
intel_uncore_frequency 12288 0
snd_sof 458752 6 snd_sof_pci,snd_sof_intel_hda_common,snd_sof_intel_hda_generic,snd_sof_probes,snd_sof_intel_hda,snd_sof_pci_intel_cnl
intel_uncore_frequency_common 16384 1 intel_uncore_frequency
x86_pkg_temp_thermal 16384 0
intel_powerclamp 20480 0
nls_iso8859_1 12288 1
snd_sof_utils 16384 1 snd_sof
snd_soc_acpi_intel_match 110592 3 snd_sof_intel_hda_generic,snd_sof_pci_intel_tgl,snd_sof_pci_intel_cnl
nls_cp437 16384 1
coretemp 16384 0
soundwire_generic_allocation 12288 1 soundwire_intel
vfat 24576 1
snd_soc_acpi 16384 2 snd_soc_acpi_intel_match,snd_sof_intel_hda_generic
soundwire_bus 143360 3 soundwire_intel,soundwire_generic_allocation,soundwire_cadence
iwlmvm 659456 0
fat 106496 1 vfat
kvm_intel 434176 0
snd_soc_avs 233472 0
snd_soc_hda_codec 28672 1 snd_soc_avs
snd_hda_ext_core 36864 7 snd_soc_avs,snd_soc_hda_codec,snd_sof_intel_hda_common,snd_soc_hdac_hdmi,snd_soc_hdac_hda,snd_sof_intel_hda_mlink,snd_sof_intel_hda
kvm 1372160 1 kvm_intel
snd_soc_core 450560 10 snd_soc_avs,snd_soc_hda_codec,soundwire_intel,snd_sof,snd_sof_intel_hda_common,snd_soc_hdac_hdmi,snd_soc_hdac_hda,snd_sof_probes,snd_soc_dmic,snd_soc_skl_hda_dsp
mac80211 1622016 1 iwlmvm
snd_compress 28672 3 snd_soc_avs,snd_soc_core,snd_sof_probes
ac97_bus 12288 1 snd_soc_core
snd_pcm_dmaengine 16384 1 snd_soc_core
snd_hda_intel 65536 0
nvidia_drm 139264 5
snd_intel_dspcfg 40960 5 snd_soc_avs,snd_hda_intel,snd_sof,snd_sof_intel_hda_common,snd_sof_intel_hda_generic
crct10dif_pclmul 12288 1
crc32_pclmul 12288 0
snd_intel_sdw_acpi 16384 2 snd_intel_dspcfg,snd_sof_intel_hda_generic
polyval_clmulni 12288 0
hid_multitouch 36864 0
snd_hda_codec 217088 10 snd_hda_codec_generic,snd_soc_avs,snd_hda_codec_hdmi,snd_soc_hda_codec,snd_hda_intel,snd_hda_codec_realtek,snd_soc_intel_hda_dsp_common,snd_soc_hdac_hda,snd_sof_intel_hda,snd_soc_skl_hda_dsp
polyval_generic 12288 1 polyval_clmulni
ptp 45056 1 iwlmvm
ghash_clmulni_intel 16384 0
sha512_ssse3 53248 0
nvidia_modeset 1671168 3 nvidia_drm
processor_thermal_device_pci 16384 0
pps_core 32768 1 ptp
sha256_ssse3 32768 0
processor_thermal_device 20480 1 processor_thermal_device_pci
hid_generic 12288 0
xe 3084288 0
libarc4 12288 1 mac80211
uvcvideo 180224 2
btusb 77824 0
sha1_ssse3 32768 0
processor_thermal_wt_hint 12288 2 processor_thermal_device_pci,processor_thermal_device
cmdlinepart 16384 0
snd_hda_core 147456 13 snd_hda_codec_generic,snd_soc_avs,snd_hda_codec_hdmi,snd_soc_hda_codec,snd_hda_intel,snd_hda_ext_core,snd_hda_codec,snd_hda_codec_realtek,snd_soc_intel_hda_dsp_common,snd_sof_intel_hda_common,snd_soc_hdac_hdmi,snd_soc_hdac_hda,snd_sof_intel_hda
aesni_intel 122880 10
btrtl 32768 1 btusb
videobuf2_vmalloc 20480 1 uvcvideo
processor_thermal_rfim 24576 1 processor_thermal_device
nvidia_uvm 3837952 0
iTCO_wdt 16384 0
gf128mul 16384 2 polyval_generic,aesni_intel
uvc 12288 1 uvcvideo
spi_nor 163840 0
intel_rapl_msr 20480 0
btintel 69632 1 btusb
snd_hwdep 20480 1 snd_hda_codec
processor_thermal_rapl 16384 1 processor_thermal_device
crypto_simd 16384 1 aesni_intel
videobuf2_memops 16384 1 videobuf2_vmalloc
intel_pmc_bxt 16384 1 iTCO_wdt
iwlwifi 577536 1 iwlmvm
intel_rapl_common 53248 2 intel_rapl_msr,processor_thermal_rapl
cryptd 28672 3 crypto_simd,ghash_clmulni_intel
drm_gpuvm 45056 1 xe
btbcm 24576 1 btusb
mtd 106496 3 spi_nor,cmdlinepart
snd_pcm 188416 13 snd_soc_avs,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,soundwire_intel,snd_sof,snd_sof_intel_hda_common,snd_soc_hdac_hdmi,snd_compress,snd_soc_core,snd_sof_utils,snd_hda_core,snd_pcm_dmaengine
watchdog 49152 1 iTCO_wdt
intel_lpss_pci 28672 0
mei_hdcp 28672 0
ucsi_acpi 16384 0
drm_exec 12288 2 drm_gpuvm,xe
mei_pxp 20480 0
processor_thermal_wt_req 12288 1 processor_thermal_device
btmtk 32768 1 btusb
intel_ish_ipc 36864 0
videobuf2_v4l2 40960 1 uvcvideo
intel_lpss 12288 1 intel_lpss_pci
rapl 20480 0
bluetooth 1073152 44 btrtl,btmtk,btintel,btbcm,bnep,btusb,rfcomm
videodev 393216 2 videobuf2_v4l2,uvcvideo
typec_ucsi 73728 1 ucsi_acpi
gpu_sched 65536 1 xe
i2c_i801 40960 0
intel_cstate 20480 0
snd_timer 49152 3 snd_seq,snd_hrtimer,snd_pcm
igen6_edac 36864 0
intel_ishtp 86016 1 intel_ish_ipc
mei_me 57344 2
spi_intel_pci 12288 0
i2c_mux 16384 1 i2c_i801
idma64 20480 0
snd 151552 25 snd_ctl_led,snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek,snd_sof,snd_timer,snd_soc_hdac_hdmi,snd_compress,snd_soc_core,snd_pcm
typec 114688 1 typec_ucsi
videobuf2_common 94208 4 videobuf2_vmalloc,videobuf2_v4l2,uvcvideo,videobuf2_memops
drm_suballoc_helper 12288 1 xe
i2c_hid_acpi 12288 0
processor_thermal_power_floor 12288 2 processor_thermal_device_pci,processor_thermal_device
intel_uncore 262144 0
cfg80211 1384448 3 iwlmvm,iwlwifi,mac80211
mc 90112 6 videodev,videobuf2_v4l2,uvcvideo,videobuf2_common
mei 200704 5 mei_hdcp,mei_pxp,mei_me
crc16 12288 1 bluetooth
spi_intel 36864 1 spi_intel_pci
nvidia_wmi_ec_backlight 12288 0
soundcore 16384 2 snd_ctl_led,snd
i2c_smbus 20480 1 i2c_i801
wmi_bmof 12288 0
8250_pci 73728 0
virt_dma 16384 1 idma64
edac_core 110592 1 igen6_edac
drm_ttm_helper 16384 2 nvidia_drm,xe
tiny_power_button 12288 0
thermal 28672 0
processor_thermal_mbox 12288 4 processor_thermal_power_floor,processor_thermal_wt_req,processor_thermal_rfim,processor_thermal_wt_hint
roles 16384 1 typec_ucsi
i2c_hid 45056 1 i2c_hid_acpi
int3403_thermal 16384 0
hid 266240 3 i2c_hid,hid_multitouch,hid_generic
fan 28672 0
battery 28672 0
button 28672 0
intel_pmc_core 122880 0
int340x_thermal_zone 16384 2 int3403_thermal,processor_thermal_device
int3400_thermal 24576 0
intel_vsec 20480 1 intel_pmc_core
acpi_thermal_rel 20480 1 int3400_thermal
intel_hid 28672 0
pmt_telemetry 16384 1 intel_pmc_core
pinctrl_tigerlake 28672 0
acpi_tad 20480 0
pmt_class 16384 1 pmt_telemetry
acpi_pad 24576 0
input_leds 12288 0
ac 16384 0
evdev 28672 35
nvidia 77529088 38 nvidia_uvm,nvidia_modeset
mac_hid 12288 0
serio_raw 16384 0
fuse 204800 5
efi_pstore 12288 0
configfs 69632 1
nfnetlink 20480 3 nft_compat,nf_tables
zram 40960 1
dmi_sysfs 24576 0
ip_tables 28672 0
x_tables 53248 8 xt_conntrack,ip6t_rpfilter,nft_compat,xt_LOG,xt_tcpudp,ipt_rpfilter,xt_pkttype,ip_tables
dm_mod 217088 0
dax 53248 1 dm_mod
btrfs 2142208 1
blake2b_generic 24576 0
libcrc32c 12288 3 nf_conntrack,btrfs,nf_tables
crc32c_generic 12288 0
xor 20480 1 btrfs
raid6_pq 122880 1 btrfs
xhci_pci 24576 0
i915 4513792 27
xhci_pci_renesas 24576 1 xhci_pci
thunderbolt 569344 0
nvme 65536 2
crc32c_intel 16384 2
xhci_hcd 389120 1 xhci_pci
rtc_cmos 28672 1
nvme_core 241664 3 nvme
nvme_auth 24576 1 nvme_core
tpm_crb 28672 0
tpm_tis 16384 0
tpm_tis_core 32768 1 tpm_tis
atkbd 40960 0
libps2 24576 1 atkbd
vivaldi_fmap 12288 1 atkbd
ideapad_laptop 69632 0
sparse_keymap 12288 2 intel_hid,ideapad_laptop
i8042 57344 1 ideapad_laptop
platform_profile 12288 1 ideapad_laptop
rfkill 40960 10 iwlmvm,bluetooth,ideapad_laptop,cfg80211
led_class 20480 5 snd_hda_codec_generic,videodev,input_leds,iwlmvm,ideapad_laptop
serio 28672 4 serio_raw,atkbd,i8042
i2c_algo_bit 20480 2 xe,i915
drm_buddy 24576 2 xe,i915
video 81920 5 nvidia_wmi_ec_backlight,ideapad_laptop,xe,i915,nvidia_modeset
wmi 32768 4 video,nvidia_wmi_ec_backlight,wmi_bmof,ideapad_laptop
backlight 28672 6 video,nvidia_wmi_ec_backlight,ideapad_laptop,xe,i915,nvidia_modeset
ttm 102400 3 drm_ttm_helper,xe,i915
intel_gtt 24576 1 i915
drm_display_helper 262144 2 xe,i915
cec 73728 3 drm_display_helper,xe,i915
efivarfs 28672 1
tpm 139264 3 tpm_tis,tpm_crb,tpm_tis_core
rng_core 20480 1 tpm
libaescfb 12288 1 tpm
ecdh_generic 16384 3 bluetooth,tpm
ecc 40960 1 ecdh_generic
autofs4 61440 0
```

### Issue Description:

This issue appears to stem from a missing `/sys/class/power_supply/BAT1/charge_start_threshold` file, which causes an error when attempting to read or set the battery threshold. Consequently, battery conservation mode cannot be activated. Adding `ideapad_laptop_conservation_mode = true` to the configuration did not resolve the issue, and loading the `ideapad_laptop` kernel module also did not have any effect.

### Expected Behavior:

The battery threshold file should be accessible and adjustable, allowing battery conservation mode to activate as expected.

Start by reproducing the failure with the reported NixOS configuration and inspect the battery threshold path /sys/class/power_supply/BAT1/charge_start_threshold. Compare the available /sys/class/power_supply/BAT1 entries with the enable_thresholds and ideapad_laptop_conservation_mode settings. Done means auto-cpufreq no longer reports this read error or clearly handles hardware where the threshold file is absent.

Escrito por el modelo de indexación a partir del texto del issue.