mrcharles
30e4d502a6
5160px x 4Bpp = 20640 bytes overflows xrdp's 16K bitmap-row buffer -> "decompressed size too big" -> dropped tiles -> Jump paints bars. 24bpp rows (15480) fit. Script part 4; live config already applied. Details: https://projects.knownelement.com/issues/611
112 lines
5.0 KiB
Bash
Executable File
112 lines
5.0 KiB
Bash
Executable File
#!/bin/bash
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# 12-fix-rdp-bigres.sh — xrdp EGFX big-resolution fix (Redmine #611)
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#
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# Symptom: Jump Desktop from iPad -> big external monitor (5160x2160)
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# showed color bars / cut sides. Root cause candidate: default EGFX
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# compressed-frame budget truncates large frames at this width.
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# freerdp UAT at 5160x2160 (all codecs + mid-session resize) is clean;
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# this mitigation raises the budget for the Jump client path.
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#
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# Idempotent: run as root on ultix-streaming.
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set -euo pipefail
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DROPIN=/etc/systemd/system/xrdp.service.d/bigres.conf
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mkdir -p "$(dirname "$DROPIN")"
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cat > "$DROPIN" <<'EOF'
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[Service]
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Environment=XRDP_GFX_MAX_COMPRESSED_BYTES=33554432
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Environment=XRDP_GFX_FRAMES_IN_FLIGHT=2
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EOF
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systemctl daemon-reload
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# bounce only when nobody is connected: check for active RDP sessions first
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ACTIVE=$(pgrep -c -f 'Xorg.*xrdp/xorg.conf' || true)
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if [ "${ACTIVE:-0}" -gt 0 ]; then
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echo "Active RDP X sessions: $ACTIVE — NOT restarting; apply at next bounce with:"
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echo " systemctl restart xrdp-sesman xrdp"
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else
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systemctl restart xrdp-sesman xrdp
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sleep 2
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systemctl is-active xrdp xrdp-sesman
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fi
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grep -q XRDP_GFX_MAX_COMPRESSED_BYTES "$DROPIN" && echo "drop-in present: $DROPIN"
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###############################################################################
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# Part 2 — kwin_x11 black-screen fix (root-caused 2026-09-01, #611)
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#
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# Symptom: RDP login -> KDE spinner -> BLACK screen. Server-side bisect
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# showed display :10 rendering pure black (colors=1): kwin_x11 was
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# crash-looping (plasma-kwin_x11.service "start operation timed out",
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# restart counter 12+). Cause: software-GL compositing init under
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# xorgxrdp (no DRI) at 5160x2160 never finishes inside the unit's
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# start timeout; systemd kills kwin -> no desktop. The "spinner" the
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# user sees is KSplash firing on every kwin restart.
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#
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# Fix: disable X11 compositing for the RDP accounts (kwin runs
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# uncomposited = instant, no GL) and give the kwin unit start-time
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# headroom. Wayland console session unaffected (Compositing/Enabled is
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# an X11-only key). Verified with the freerdp harness on rdptest:
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# fresh 1408x945 / fresh 5160x2160 / resize up mid-session / resize
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# down on reconnect — all render real desktops.
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###############################################################################
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for ACCOUNT in reachableceo reachableceo-offstage; do
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runuser -u "$ACCOUNT" -- kwriteconfig6 --file kwinrc \
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--group Compositing --key Enabled false
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echo "kwinrc Compositing=false: $ACCOUNT"
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done
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mkdir -p /etc/systemd/user/plasma-kwin_x11.service.d
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cat > /etc/systemd/user/plasma-kwin_x11.service.d/bigres-timeout.conf <<'EOF'
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[Service]
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# big-res xorgxrdp sessions: software-GL init is slow; give kwin room
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# instead of kill+crashloop (#611)
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TimeoutStartSec=300
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EOF
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systemctl daemon-reload
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###############################################################################
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# Part 3 — EGFX off for all clients (drdynvc=false), 2026-09-01 evening
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#
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# Final piece of #611: with the server rendering CLEAN at 5160x2160
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# (verified by band-analysis of live captures + freerdp harness on every
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# codec), Jump Desktop still painted color bars down the side — its
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# decode of xrdp's EGFX large frames is broken regardless of the
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# compressed-frame budget. EGFX rides the drdynvc channel; blocking it
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# server-side makes every client (Jump included) fall back to the
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# classic codecs, which render this monitor fine. Clipboard (cliprdr)
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# and audio (rdpsnd) are separate channels and survive.
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###############################################################################
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sed -i 's/^drdynvc=true/drdynvc=false/' /etc/xrdp/xrdp.ini
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grep -q '^drdynvc=false' /etc/xrdp/xrdp.ini || { echo "drdynvc line missing; check /etc/xrdp/xrdp.ini" >&2; exit 1; }
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###############################################################################
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# Part 4 — max_bpp=24: the actual color-bars root cause (2026-09-01 night)
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#
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# With EGFX off, Jump's fallback is classic bitmap tiles — and xrdp's
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# bitmap path DROPS tiles with "libxrdp_send_bitmap: error, decompressed
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# size too big: 20640 bytes" because 5160 px * 4 Bpp overflows the 16K
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# row buffer. Jump paints the dropped tiles as bars. At 24bpp the row
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# is 15480 bytes and fits. (freerdp never hit this: it negotiates
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# NSCodec/planar after EGFX goes away.)
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###############################################################################
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sed -i 's/^max_bpp=.*/max_bpp=24/' /etc/xrdp/xrdp.ini
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grep -q '^max_bpp=24' /etc/xrdp/xrdp.ini || { echo "max_bpp line missing; check /etc/xrdp/xrdp.ini" >&2; exit 1; }
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ACTIVE=$(pgrep -c -f 'Xorg.*xrdp/xorg.conf' || true)
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if [ "${ACTIVE:-0}" -gt 0 ]; then
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echo "Active RDP X sessions: $ACTIVE — xrdp listener restart will blip clients;"
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echo "sessions survive (sesman untouched). Apply with: systemctl restart xrdp"
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else
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systemctl restart xrdp
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fi
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echo "EGFX disabled (drdynvc=false) — clients now negotiate classic codecs."
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echo "kwin unit override: /etc/systemd/user/plasma-kwin_x11.service.d/bigres-timeout.conf"
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echo
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echo "If a session is currently black: loginctl terminate-session <id> (or"
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echo "loginctl terminate-user <user> for their RDP sessions) and reconnect."
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