75 lines
2.4 KiB
Bash
Executable File
75 lines
2.4 KiB
Bash
Executable File
#!/bin/sh
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# setup-i915-kernel7-fix.sh
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#
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# Run on a fresh hp-chell (HP Chromebook 13 "chell", coreboot/MrChromebox
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# firmware, KDE neon) install to apply two things:
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#
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# 1. The kernel 7.x cold-boot black-screen workaround: a
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# /usr/share/sddm/scripts/Xsetup hook that forces a second modeset
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# on eDP-1 to un-stick i915's pipe A on 7.x kernels. See project
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# CLAUDE.md for the full diagnosis writeup.
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# 2. GRUB_TIMEOUT=5 / GRUB_TIMEOUT_STYLE=menu, so the boot menu is
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# visible for 5 seconds (useful for picking a fallback kernel like
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# 6.17.0-42-generic if a future 7.x point release regresses again).
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#
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# Safe to re-run; idempotent.
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set -eu
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if [ "$(id -u)" -ne 0 ]; then
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echo "must run as root (sudo $0)" >&2
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exit 1
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fi
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echo "==> installing SDDM Xsetup i915 kernel-7.x workaround"
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cat > /usr/share/sddm/scripts/Xsetup << 'EOF'
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#!/bin/sh
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# Xsetup - run as root before the login dialog appears
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if [ -e /sbin/prime-offload ]; then
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echo running NVIDIA Prime setup /sbin/prime-offload
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/sbin/prime-offload
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fi
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# Workaround: on kernel 7.x, the first i915 modeset at cold boot (Xorg's
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# auto-modeset to the panel's native 3200x1800) leaves pipe A in a bad
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# state (persistent CPU pipe A FIFO underrun -> blank panel, backlight
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# still on, even though DRM/plane state reports healthy). Forcing a
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# second modeset unsticks it. Rather than cycle back to native, just
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# land on 1600x900 (exact half of 3200x1800, clean 2x integer scaling)
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# and stay there -- it's only the login screen; the logged-in session
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# renews the modeset itself and comes up at full native resolution.
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# Not needed on 6.17.x kernels. See project CLAUDE.md for the full
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# writeup.
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case "$(uname -r)" in
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7.*)
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xrandr --output eDP-1 --mode 1600x900 >/tmp/xsetup-modeset.log 2>&1
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echo "set eDP-1 to 1600x900 (i915 kernel 7.x cold-boot workaround)"
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;;
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esac
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EOF
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chmod 755 /usr/share/sddm/scripts/Xsetup
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echo "==> setting GRUB_TIMEOUT=5 / GRUB_TIMEOUT_STYLE=menu"
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grub_conf=/etc/default/grub
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set_grub_key() {
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key=$1
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value=$2
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if grep -q "^${key}=" "$grub_conf"; then
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sed -i "s|^${key}=.*|${key}=${value}|" "$grub_conf"
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elif grep -q "^#${key}=" "$grub_conf"; then
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sed -i "s|^#${key}=.*|${key}=${value}|" "$grub_conf"
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else
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echo "${key}=${value}" >> "$grub_conf"
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fi
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}
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set_grub_key GRUB_TIMEOUT 5
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set_grub_key GRUB_TIMEOUT_STYLE menu
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echo "==> running update-grub"
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update-grub
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echo "==> done"
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