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katzzero edited this page Jul 9, 2026 · 5 revisions

08 — Display & Audio

The BC-250 has one DisplayPort 1.4 output and no HDMI. Audio must be routed through DP or a USB adapter.

Display Connection Options

Method Quality Audio Recommended?
Native DisplayPort Best (up to 4K@120Hz, HDR10) ✅ Works (most users) ✅ Best option if monitor supports DP
Passive DP-to-HDMI Good (1080p60 / 1440p60) ✅ Usually works ✅ Good value (~$5–10)
Active DP-to-HDMI Up to 4K@60Hz+ Broken on BC-250 (direct connection). Works on MST hub outputs (pops1cl/Discord). Not recommended for direct use; usable with MST hubs
DP-to-USB-C Good ✅ Works ✅ Good for USB-C monitors

Recommended Cable/Adapter

Product Type Notes
Passive DP-to-HDMI (generic) Passive adapter Best value — works at 1080p60/1440p60 with audio, ~$5–10
AmazonBasics DP to HDMI (B015OW3M1W) Passive Video works, audio hit-or-miss
UANTIN DP to HDMI (B0CYHB956B) Passive Confirmed working, Amazon UK

BIOS Display Issue — "No Display in BIOS"

If you can't see the BIOS screen but the OS boots fine:

  • Use a native DP cable instead of adapters
  • Some adapters don't initialize fast enough for BIOS — try a different adapter or cable

Audio Solutions

Option 1: Audio Over DisplayPort (Best)

Audio is transmitted natively through DisplayPort. If your monitor has speakers or you use a DP-to-HDMI passive adapter, audio should work automatically.

DP audio fix: Fixed in Linux 6.19.10+ (included in CachyOS, available in Bazzite desktop testing branch). Fix contributed by TheFloW (PS5 Linux developer), relayed by fanoush.

Adapter audio status (May 2026):

  • Passive adapters: Audio works correctly, no issues reported with kernel 6.19+.
  • Active DP-to-HDMI (UGREEN 8K60Hz): Audio dropouts every ~38 seconds (essdee4336). Active adapters enable 1440p@120Hz but audio quality suffers. 4K not recommended on this board.
  • Passive DP-to-HDMI (generic): Limited to HDMI 1.4 (1080p60 / 1440p60, no 120Hz). Audio works fine.
  • Note: Some Bazzite users still report pitch-shifted audio via DP→HDMI even on recent kernels (nataliezaki, May 2026). Native DP connection avoids all audio issues.

Option 2: USB Sound Card (Most Reliable Fix)

If audio over DP isn't working, use a USB audio adapter:

Product ASIN Notes
Creative Sound Blaster Play! 4 B08T9LM3LM 24-bit/192 kHz, ~$25-34. Note: not frequently mentioned in community — most users prefer generic USB audio dongles (Sabrent, UGREEN, Apple).
SABRENT AU-EMCB B00XM883BK Budget option, confirmed working, plug and play (ASIN verified)
Cheap USB-C phone dongle Various Works with USB-C to A adapter; Apple USB-C adapter + A-C adapter confirmed

⚠️ The ASIN B0BQ5VJVWB that appeared in some older guides is an Amazon Renewed listing and may not always be available. The standard retail ASIN is B08T9LM3LM (Play! 4) or B06XBZ38ZJ (Play! 3).

VRR (Variable Refresh Rate)

VRR is now achievable through multiple paths:

  1. CachyOS (kernel 6.19): VRR works natively (steffman_, help-thread). Tested with UGREEN 8K DP-to-HDMI 2.1 adapter at 4K 120Hz with VRR and sound all working simultaneously via USB sound card.
  2. Custom Bazzite image: Community image with AMD VRR kernel patches confirmed working on Bazzite Deck with OLED. Audio desyncs on expensive DP>HDMI adapters, but cheap Aliexpress 4k60hz adapters support VRR without audio issues.
  3. Kernel 6.19+: Built-in VRR fixes (fforduck/Discord).

Adapter notes for VRR:

  • UGREEN 8K DP-to-HDMI 2.1: Would give 4K 120Hz HDR + VRR if audio gets sorted (currently desyncs on custom Bazzite build).
  • Cheap Aliexpress 4K 60Hz adapters: Support VRR on kernel 6.19+ and do NOT have audio desync issues -- best current option (fforduck, Apr 2026). Note: earlier community reports (essdee4336, Apr 2026) said cheap adapters do NOT support VRR; resolved by kernel 6.19+ patches.
  • Expensive DP>HDMI adapters: VRR not supported, audio desync on custom Bazzite builds.

Multi-Monitor Setup

Method Notes
DisplayPort MST Hub Works on Bazzite. Maximum 2 screens via MST on BC-250 (elektricM). Active DP→HDMI adapters work on hub outputs (pops1cl/Discord). ⚠️ More than 2 monitors on an MST hub can crash the amdgpu driver (pops1cl/Discord).

Tested MST Hub Compatibility (elektricM docs):

Adapter Display-out DP Display Audio Notes
StarTech MST14DP122DP DP (2) 1.4 Yes Yes Worked consistently across different monitors/cables
Monoprice 21972 DP (2) 1.2 Mirror only Yes Unable to extend displays
ENBUER DP (2) 1.2? Mirror only Yes Unable to extend displays
Generic HDMI (2) N/A No No No video or audio
DisplayLink Dock USB (DisplayLink) N/A Yes (desktop only) Yes Desktop use only, not gaming. V7 Universal (Best Buy 10872445) claimed dual HDMI on Bazzite.
Dell ACP075EU USB (DisplayLink) N/A Yes (desktop only) Yes Docking station with DisplayLink + USB DAC — claimed works

Monitor Recommendations

Use Case Recommended Spec
General gaming 1080p, 144 Hz, IPS panel, DP 1.4 certified cable
Best value 1080p 60 Hz (you won't miss higher refresh at 60 FPS)
1440p gaming 1440p@144Hz DP monitor, DP 1.4 cable <2m; use FSR Quality to hit 60 FPS
4K 4K@60Hz monitor with DP; use active DP-to-HDMI adapter for HDMI display + USB audio

At 1080p native with the BC-250, you'll get the sharpest image and best performance. FSR handles upscaling well if you go higher resolution.

VRS 640x480 Resolution Fix

Some games render at 640x480 due to broken Variable Rate Shading on Cyan Skillfish. bangstk's Vulkan_NullVRS layer nullifies VRS commands:

git clone https://github.com/bangstk/Vulkan_NullVRS.git
cd Vulkan_NullVRS
make
mkdir -p ~/.local/share/vulkan/implicit_layer.d
cp ./Vulkan_NullVRS.json ~/.local/share/vulkan/implicit_layer.d/
cp ./libVulkan_NullVRS.so ~/.local/share/vulkan/implicit_layer.d/

Steam launch option: ENABLE_VK_NULLVRS_1=1 %command%

BC-250 Unofficial Community Guide — maintained by katzzero. Discord · GitHub · elektricM Docs

BC-250 Unofficial Community Guide

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