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Framebuffer Guide for HP EliteDesk 800 G4/G5 UHD 630

This document defines the recommended DisplayPort (DP) framebuffer baseline for the HP EliteDesk 800 G4/G5 family in both 35W and 65W variants.

The recommendations in this guide apply to systems using Intel UHD 630 and are split by CPU generation:

  • Gen 8 should use 0000923E as the stable baseline.
  • Gen 9 should use 07009B3E based on real-world testing provided by JimiZhou.

For both generations, the most suitable boot-args for this DP configuration are:

keepsyms=1 igfxonln=1 igfxfw=2

Scope

This framebuffer setup is intended for the following systems:

  • HP EliteDesk 800 G4 / G5
  • 35W and 65W variants
  • Intel UHD 630 iGPU
  • DisplayPort output

This is a DisplayPort-focused baseline and should not be treated as a universal HDMI or DVI mapping.

Recommended Baseline

Generation Target systems Recommended AAPL,ig-platform-id Boot-args Output Status
Gen 8 HP EliteDesk 800 G4/G5 35W/65W 0000923E keepsyms=1 igfxonln=1 igfxfw=2 DP Stable baseline Notes
Gen 9 HP EliteDesk 800 G4/G5 35W/65W 07009B3E keepsyms=1 igfxonln=1 igfxfw=2 DP Recommended from JimiZhou testing

DeviceProperties Path

Apply the values below under:

DeviceProperties -> Add -> PciRoot(0x0)/Pci(0x2,0x0)

Framebuffer Table

Key Type Gen 8 Gen 9
AAPL,GfxYTile Data 01000000 01000000
AAPL,ig-platform-id Data 0000923E 07009B3E
framebuffer-con0-busid Data 01000000 01000000
framebuffer-con0-enable Data 01000000 01000000
framebuffer-con0-flags Data C7030000 C7030000
framebuffer-con0-index Data 01000000 01000000
framebuffer-con0-type Data 00080000 00080000
framebuffer-con1-busid Data 02000000 02000000
framebuffer-con1-enable Data 01000000 01000000
framebuffer-con1-flags Data C7030000 C7030000
framebuffer-con1-index Data 02000000 02000000
framebuffer-con1-type Data 00080000 00080000
framebuffer-con2-busid Data 04000000 04000000
framebuffer-con2-enable Data 01000000 01000000
framebuffer-con2-flags Data C7030000 C7030000
framebuffer-con2-index Data 03000000 03000000
framebuffer-con2-type Data 00080000 00080000
framebuffer-patch-enable Data 01000000 01000000
graphic-options Data C0000000 C0000000

Boot Arguments

Use the following boot-args for both Gen 8 and Gen 9:

keepsyms=1 igfxonln=1 igfxfw=2

OpenCore Snippets

DeviceProperties

<key>DeviceProperties</key>
<dict>
  <key>Add</key>
  <dict>
    <key>PciRoot(0x0)/Pci(0x2,0x0)</key>
    <dict>
      <key>AAPL,GfxYTile</key>
      <data>AQAAAA==</data>
      <key>AAPL,ig-platform-id</key>
      <data><!-- Gen 8: AACSPg== | Gen 9: BwCbPg== --></data>
      <key>framebuffer-con0-busid</key>
      <data>AQAAAA==</data>
      <key>framebuffer-con0-enable</key>
      <data>AQAAAA==</data>
      <key>framebuffer-con0-flags</key>
      <data>xwMAAA==</data>
      <key>framebuffer-con0-index</key>
      <data>AQAAAA==</data>
      <key>framebuffer-con0-type</key>
      <data>AAgAAA==</data>
      <key>framebuffer-con1-busid</key>
      <data>AgAAAA==</data>
      <key>framebuffer-con1-enable</key>
      <data>AQAAAA==</data>
      <key>framebuffer-con1-flags</key>
      <data>xwMAAA==</data>
      <key>framebuffer-con1-index</key>
      <data>AgAAAA==</data>
      <key>framebuffer-con1-type</key>
      <data>AAgAAA==</data>
      <key>framebuffer-con2-busid</key>
      <data>BAAAAA==</data>
      <key>framebuffer-con2-enable</key>
      <data>AQAAAA==</data>
      <key>framebuffer-con2-flags</key>
      <data>xwMAAA==</data>
      <key>framebuffer-con2-index</key>
      <data>AwAAAA==</data>
      <key>framebuffer-con2-type</key>
      <data>AAgAAA==</data>
      <key>framebuffer-patch-enable</key>
      <data>AQAAAA==</data>
      <key>graphic-options</key>
      <data>wAAAAA==</data>
    </dict>
  </dict>
</dict>

NVRAM Boot-args

<key>NVRAM</key>
<dict>
  <key>Add</key>
  <dict>
    <key>7C436110-AB2A-4BBB-A880-FE41995C9F82</key>
    <dict>
      <key>boot-args</key>
      <string>keepsyms=1 igfxonln=1 igfxfw=2</string>
    </dict>
  </dict>
</dict>

Generation Notes

Gen 8

For Gen 8 systems in the HP EliteDesk 800 G4/G5 family, use:

AAPL,ig-platform-id = 0000923E

This is the recommended stable baseline for DisplayPort-based UHD 630 systems in this family.

Gen 9

For Gen 9 systems in the HP EliteDesk 800 G4/G5 family, use:

AAPL,ig-platform-id = 07009B3E

This is the recommended baseline based on testing reported by JimiZhou, including improved idle behavior, cleaner GPU activity, and stable VideoToolbox support on DP output.

Notes

  • This mapping is intended for DisplayPort setups.
  • All three connector types use 00080000, which corresponds to DP in this baseline.
  • For this HP EliteDesk 800 family, the safest baseline is to split framebuffer recommendations by CPU generation rather than forcing a single shared platform-id.

Tip

  • For Gen 8 users, 0000923E with keepsyms=1 igfxonln=1 igfxfw=2 remains the recommended stable starting point.
  • If a Gen 8 system shows screen glitches, brief display corruption, or a blank screen when the DisplayPort cable is unplugged and reconnected, or if this behavior happens occasionally, try switching to 07009B3E while keeping the same boot-args: keepsyms=1 igfxonln=1 igfxfw=2.
  • 07009B3E is the more flexible option overall, because it can be used on both Gen 8 and Gen 9 systems. For Gen 8, keep 0000923E as the stable default, but use 07009B3E as the preferred fallback when the default framebuffer does not behave cleanly.

Troubleshooting

Use the checks below if the system boots but graphics behavior is not clean:

  • Confirm that AAPL,ig-platform-id matches the correct CPU generation.
  • Confirm that the connector type for con0, con1, and con2 remains 00080000 for DP.
  • Confirm that boot-args contains keepsyms=1 igfxonln=1 igfxfw=2.
  • If graphics acceleration appears present but idle power, WindowServer usage, or GPU Busy remains unusually high, re-check the platform-id first before testing extra boot-args.
  • Only add extra boot-args such as igfxagdc=0 or darkwake=2/darkwake=3 when troubleshooting a specific display-policy or sleep/wake issue.

Special Thanks

Special thanks to @JimiZhou for the detailed testing, comparative results, and validation work that helped confirm 07009B3E as the recommended Gen 9 DisplayPort framebuffer baseline for this HP EliteDesk 800 G4/G5 UHD 630 family. More Detail: issues/10.