Waveshare E-Paper Display driver 7.5in-bv2 loses contrast after update

The problem

Hi, it looks like the last update caused a problem on my Waveshare E-Paper Display with Driver 7.5in-bv2. Before the update the contrast was very good (see screenshot) but now everything is washed out and much darker. Can I change anything myself? BR

https://github.com/quito96/waveshare_epaper_7.5inch

Which version of ESPHome has the issue?

ESPHome 2023.9.3

What type of installation are you using?

Home Assistant Add-on

Which version of Home Assistant has the issue?

Home Assistant 2023.10.3

What platform are you using?

ESP32

Board

E-Paper ESP32 Driver Board

Component causing the issue

Waveshare 7.5inch E-Paper (B) E-Ink Raw Display

Example YAML snippet

# --- Display Layout -----------------------------------------------------------
display:
  - platform: waveshare_epaper
    cs_pin: 15
    dc_pin: 27
    busy_pin: 25
    reset_pin: 26
    reset_duration: 2ms
    model: 7.50in-bV2
    update_interval: 600s
    lambda:

Anything in the logs that might be useful for us?

INFO ESPHome 2023.9.3
INFO Reading configuration /config/esphome/waveshare-disp.yaml...
INFO Detected timezone 'Europe/Berlin'
WARNING GPIO15 is a Strapping PIN and should be avoided.
Attaching external pullup/down resistors to strapping pins can cause unexpected failures.
See https://esphome.io/guides/faq.html#why-am-i-getting-a-warning-about-strapping-pins
INFO Generating C++ source...
INFO Compiling app...
Processing waveshare-disp (board: esp32dev; framework: arduino; platform: platformio/espressif32@5.4.0)
--------------------------------------------------------------------------------
HARDWARE: ESP32 240MHz, 320KB RAM, 4MB Flash
 - toolchain-xtensa-esp32 @ 8.4.0+2021r2-patch5
Dependency Graph
|-- AsyncTCP-esphome @ 2.0.1
|-- WiFi @ 2.0.0
|-- FS @ 2.0.0
|-- Update @ 2.0.0
|-- ESPAsyncWebServer-esphome @ 3.1.0
|-- DNSServer @ 2.0.0
|-- ESPmDNS @ 2.0.0
|-- noise-c @ 0.1.4
|-- SPI @ 2.0.0
RAM:   [=         ]  12.9% (used 42256 bytes from 327680 bytes)
Flash: [======    ]  57.9% (used 1062565 bytes from 1835008 bytes)
========================= [SUCCESS] Took 23.93 seconds =========================
INFO Successfully compiled program.
INFO Resolving IP address of waveshare-disp.local
INFO  -> 192.168.2.144
INFO Uploading /data/build/waveshare-disp/.pioenvs/waveshare-disp/firmware.bin (1068336 bytes)
Uploading: [============================================================] 100% Done...

INFO Waiting for result...
INFO OTA successful
INFO Successfully uploaded program.
INFO Starting log output from waveshare-disp.local using esphome API
INFO Successfully connected to waveshare-disp.local
[11:38:18][I][app:102]: ESPHome version 2023.9.3 compiled on Oct  4 2023, 10:11:36
[11:38:18][C][wifi:546]: WiFi:
[11:38:18][C][wifi:382]:   Local MAC: 58:BF:25:90:1A:1C
[11:38:18][C][wifi:383]:   SSID: 'Quitos-Net'[redacted]
[11:38:18][C][wifi:384]:   IP Address: 192.168.2.144
[11:38:18][C][wifi:386]:   BSSID: 44:4E:6D:D3:8C:B4[redacted]
[11:38:18][C][wifi:387]:   Hostname: 'waveshare-disp'
[11:38:18][C][wifi:389]:   Signal strength: -71 dB ▂▄▆█
[11:38:18][C][wifi:393]:   Channel: 11
[11:38:18][C][wifi:394]:   Subnet: 255.255.255.0
[11:38:18][C][wifi:395]:   Gateway: 192.168.2.1
[11:38:18][C][wifi:396]:   DNS1: 192.168.2.1
[11:38:18][C][wifi:397]:   DNS2: 0.0.0.0
[11:38:18][D][api:102]: Accepted 192.168.2.40
[11:38:18][W][component:204]: Component api took a long time for an operation (0.05 s).
[11:38:18][W][component:205]: Components should block for at most 20-30ms.
[11:38:18][C][logger:357]: Logger:
[11:38:18][C][logger:358]:   Level: DEBUG
[11:38:18][C][logger:359]:   Log Baud Rate: 115200
[11:38:18][C][logger:361]:   Hardware UART: UART0
[11:38:18][C][spi:067]: SPI bus:
[11:38:18][C][spi:068]:   CLK Pin: GPIO13
[11:38:18][C][spi:069]:   SDI Pin: 
[11:38:18][C][spi:070]:   SDO Pin: GPIO14
[11:38:18][C][spi:072]:   Using HW SPI: SPI
[11:38:18][D][api.connection:1031]: Home Assistant 2023.10.3 (192.168.2.40): Connected successfully
[11:38:18][D][time:045]: Synchronized time: 2023-10-17 11:38:18
[11:38:18][C][template.text_sensor:020]: Template Sensor 'uptime_human'
[11:38:18][C][template.text_sensor:020]:   Icon: 'mdi:clock-start'
[11:38:19][C][uptime.sensor:031]: Uptime Sensor 'uptime_sensor'
[11:38:19][C][uptime.sensor:031]:   Device Class: 'duration'
[11:38:19][C][uptime.sensor:031]:   State Class: 'total_increasing'
[11:38:19][C][uptime.sensor:031]:   Unit of Measurement: 's'
[11:38:19][C][uptime.sensor:031]:   Accuracy Decimals: 0
[11:38:19][C][uptime.sensor:031]:   Icon: 'mdi:timer-outline'
[11:38:19][C][homeassistant.time:010]: Home Assistant Time:
[11:38:19][C][homeassistant.time:011]:   Timezone: 'CET-1CEST,M3.5.0,M10.5.0/3'
[11:38:19][C][waveshare_epaper:1324]: Waveshare E-Paper
[11:38:19][C][waveshare_epaper:1324]:   Rotations: 0 °
[11:38:19][C][waveshare_epaper:1324]:   Dimensions: 800px x 480px
[11:38:19][C][waveshare_epaper:1325]:   Model: 7.5in-bv2
[11:38:19][C][waveshare_epaper:1326]:   Reset Pin: GPIO26
[11:38:19][C][waveshare_epaper:1327]:   DC Pin: GPIO27
[11:38:19][C][waveshare_epaper:1328]:   Busy Pin: GPIO25
[11:38:19][C][waveshare_epaper:1329]:   Update Interval: 600.0s
[11:38:19][C][captive_portal:088]: Captive Portal:
[11:38:19][C][mdns:115]: mDNS:
[11:38:19][C][mdns:116]:   Hostname: waveshare-disp
[11:38:19][C][ota:097]: Over-The-Air Updates:
[11:38:19][C][ota:098]:   Address: waveshare-disp.local:3232
[11:38:19][C][ota:101]:   Using Password.
[11:38:19][C][api:138]: API Server:
[11:38:19][C][api:139]:   Address: waveshare-disp.local:6053
[11:38:19][C][api:141]:   Using noise encryption: YES
[11:38:19][C][wifi_signal.sensor:009]: WiFi Signal 'wifisignal'
[11:38:19][C][wifi_signal.sensor:009]:   Device Class: 'signal_strength'
[11:38:19][C][wifi_signal.sensor:009]:   State Class: 'measurement'
[11:38:19][C][wifi_signal.sensor:009]:   Unit of Measurement: 'dBm'
[11:38:19][C][wifi_signal.sensor:009]:   Accuracy Decimals: 0

Additional information

Waveshare_7 50in-bV2

esphome / issues

Waveshare E-Paper Display driver 7.5in-bv2 loses contrast after update #4990