All the GDDR6 sits on the underside of the board, opposite the APU, so
the "1.5mm on front of board" recommendation was wrong. There are no VRAM
chips on the APU side, that side takes paste on the die. prerequisites.md
also listed 1mm/1.5mm while cooling.md and performance.md said 2mm.
Standardise on 2mm for the underside memory pads, add a "verify the gap on
your board" caveat, drop the phantom front-side pads, and link
prerequisites to the cooling procedure so the value lives in one place.
Closes#34.
The BC-250 enumerates as /sys/class/drm/card0 on a typical install (no
secondary GPU). Verified live on Fedora 43, kernel 7.0.9, PCI 1002:13fe.
Many doc snippets hardcoded card1, so copy-paste failed on a stock single-
GPU board.
Replaced /sys/class/drm/card1/ with /sys/class/drm/card0/ across:
bios/overclocking.md, bios/vram.md, drivers/radv.md,
getting-started/quick-start.md, linux/{arch,bazzite,cachyos,debian,fedora}.md,
reference/quick-reference.md, system/{governor,sensors}.md,
troubleshooting/{boot,display,performance,stability}.md.
Existing card0-vs-card1 disclaimers preserved at governor.md L166/L503,
quick-start.md L78, bazzite.md L104, kernel.md L222 (and quick-reference.md
intro rewritten to lead with card0 + note the iGPU edge case).
Key fixes:
- nct6687 for fan control (not nct6683 which is read-only)
- GPU is card1 not card0 in all sysfs paths
- Fan on pwm2/fan2 (Pump Fan header), not pwm1
- Vulkan 1.4.328 (not 1.3), Mesa 25.3.6 (not 25.2.4)
- cpupower doesn't work on BC-250 (removed recommendations)
- pp_dmu_clock -> pp_dpm_mclk
- ACPI fix marked as optional/experimental (not essential)
- amdgpu.sg_display=0 only needed for kernels < 6.10
- GPU voltage range 700-1129 mV (from OD_RANGE)
- Added CoolerControl installation instructions
- Expanded sensors.md with proper nct6687 setup guide
- Replace oberon-governor with cyan-skillfish-governor-tt as default across
bazzite, debian, arch, cachyos, fedora, power, quick-reference, display,
performance, radv, and stability pages (oberon remains documented as legacy)
- Add "Black Screen on GPU Reset (Governor Running)" section to
troubleshooting/stability.md (source: Discord user nohanmv, Feb 26)
- Remove AI filler: "comprehensive" from index/sensors, unverifiable stats
(3500+ members, 100+ solutions, 30+ games, 9716/7000+ messages analyzed,
90%/95% success rates)
- Remove unverifiable 8K @60Hz display claim
- Update governor config examples from oberon YAML format to
cyan-skillfish-governor-tt TOML format
- Normalize community links to point to filippor/cyan-skillfish-governor
- Remove old oberon-setup.sh script from quick-start (conflicts with
cyan-skillfish-governor-tt install instructions above it)
- Remove unverifiable performance target numbers from quick-start
- Update troubleshooting to reference cyan-skillfish-governor-tt
- Tone down backplate VRAM cooling from DANGER/required to info/recommended
(community: "ram cooling nonsense" — akxfile, Dec 2025)
- Remove oberon automated setup as primary install method on bazzite page
Second pass cleanup:
- overclocking: remove fabricated FPS numbers, restructure to lead with
governor install, remove bloated cooling/PSU tables, add community refs
- vram: 512MB is not universally best — some games need 4-8GB static
- cooling: tone down VRAM backplate alarmism (recommended, not critical)
- power: 6-pin works fine for most setups, not just 8-pin
- quick-start: match toned-down backplate cooling language
- Add explicit note that HW video encode/decode doesn't work (VCN firmware blocked by Sony)
- Add danger warning about Smokeless_UMAF causing permanent damage
Rebasing to patched Bazzite images can remove USB WiFi drivers since the
BC-250 has no built-in wireless. Added prominent warnings to bazzite.md
performance section and prerequisites.md with recovery steps.
- Fix service name: oberon-governor.service → cyan-skillfish-governor-tt.service
(matches the package actually being installed)
- Promote SMU governor from "emerging" to recommended alternative
- Add essential ACPI fix warning
- Update verification commands to match installed governor
The broken kernel range is 6.17.8-6.17.10, not 6.17.8+ — kernel 6.17.11+
has the fix applied. Updated 11 files to use the precise range and added
6.17.11+/6.18.x as recommended alternatives. Also added a warning about
6.19.x PCIe issues reported in March 2026.
- Remove unverified 980 MHz instability claim (no source found)
- Correct M.2 slot specification: PCIe Gen 2 x2 (not Gen 3)
- Add critical warning: 350 MHz governor config requires kernel patch
- Document governor crash with std::__ios_failure on stock kernels
- Instruct users to use min: 1000 MHz without kernel patch
Based on Discord feedback from community members questioning
documentation accuracy.
- Replace deprecated fedora-setup.sh with modern manual installation steps
* Mesa 25.1+ now included in Fedora 43 repos (no COPR needed)
* Governor installation via @exotic-soc/oberon-governor COPR
* Updated in quick-start.md and troubleshooting/display.md
- Fix idle power specifications in prerequisites.md
* Corrected minimum idle power: 70-85W (was incorrectly 50-80W)
* Added note about GPU freq patch increasing max power to 250W+
- Update footer GitHub link to elektricM/amd-bc250-docs
* Changed from mothenjoyer69/bc250-documentation
* Updated in mkdocs.yml and introduction.md
All changes verified with mkdocs build --strict (no warnings).
Applied comprehensive corrections from Discord community (DeathStalker, Astrocast,
and others) to fix inaccuracies, remove outdated procedures, and improve readability.
CRITICAL SAFETY FIXES:
- IOMMU: Changed from "optional" to "MUST disable" across all docs
- Removed dangerous `amd_iommu=on` kernel parameter (causes crashes)
- Added danger warnings that IOMMU is broken on BC-250
BIOS & VRAM FIXES:
- Fixed BIOS flashing guide: removed fake "ZIP file" references
- Added link to actual flasher utility (separate from ROM download)
- Removed made-up Windows utility steps, added real ASRock method
- Removed AMIBCP/Smokeless section (not used, P5.00_clv has all unlocked)
- VRAM docs: reduced verbosity by 40%, emphasized 512MB is DYNAMIC
- Added ZRAM conflict warning (crashes in RDR2 with dynamic VRAM)
COOLING & HARDWARE:
- Removed impractical fin cutting/screwing instructions
- Removed J4003 header references (not for normal users)
- Added tower cooler downside (must cool VRAMs separately)
- Static pressure already correct at 6.9 mm H2O
LINUX DISTRIBUTION UPDATES:
- Fedora: Removed outdated setup script, Mesa 25.1 now in repos
- Fedora: nomodeset no longer needed on 42/43 with working kernels
- Bazzite: Removed "on steroids" section (patch included by default)
- CachyOS: Simplified from custom ISO to standard installation
- Updated KDE vs GNOME: GNOME recommended for stability (6 changes)
- SteamOS/Ubuntu: Already added in previous commit (verified)
GOVERNOR & DRIVERS:
- Prioritized COPR installation over building from source
- Added @exotic-soc/oberon-governor and filippor/bazzite repos
- Display adapters: Now recommend PASSIVE (audio works) over active
IMPOSSIBLE FEATURES REMOVED:
- Fortnite: Clarified it cannot run (Easy Anti-Cheat)
- ROCm training: Corrected to "experimental/limited" (doesn't work)
Desktop Environment: GNOME now recommended over KDE for stability
(KDE had Qt RDSEED bug, now fixed but GNOME more tested)
Files modified: 14
Community credits: DeathStalker, Astrocast, legodude
Fixed multiple issues identified by DeathStalker and Astrocast:
Hardware corrections:
- FSP500 model: FSP500-30AS (not FSP500-50FGBBI)
- Board length: 340mm/310mm (not ~200mm)
- Added Arctic P12 Pro to cooling (more available than Max)
- Power draw: Can exceed 235W with GPU frequency patch
GPU comparisons:
- Standardized to GTX 1660 Ti (removed inconsistent 3060 Ti refs)
VRAM allocation:
- Clarified 512MB setting is DYNAMIC (not a limit)
- Can allocate nearly full 16GB to GPU (~14GB+)
Software updates:
- Fedora 42/43: nomodeset no longer needed with working kernels
- COPR repos available for governors (Fedora/Bazzite)
- Added SteamOS to distro list (Mesa now updated)
- Added Ubuntu to supported distros
Thanks to DeathStalker and Astrocast for detailed feedback.
Corrected kernel compatibility throughout documentation based on community feedback:
PREVIOUS (INCORRECT):
- Stated 'avoid kernel 6.15+' entirely
- Recommended only 6.12-6.14 LTS
CORRECTED:
- 6.15.0-6.15.6: Broken (GPU init fails)
- 6.15.7-6.17.7: Works (recommended, kernel support fixed)
- 6.17.8+: Broken again (GPU driver issues)
- 6.12-6.14 LTS: Still works (stable fallback)
Updated 15 files across all sections:
- Linux setup guides (Fedora, Arch, Debian, CachyOS, etc.)
- Troubleshooting (boot, display, performance, stability)
- Getting started guides
- Main index and quick reference
- Gaming compatibility
Thanks to Astrocast and DeathStalker for the correction.
