Fix GRUB bitmap error: switch from PNG to TGA for splash logo

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GRUB's PNG reader (grub2 bookworm) fails to load bee-logo.png despite the
file being valid RGB 8-bit non-interlaced PNG with minimal chunks. Root
cause is a known fragility in GRUB's png.c; exact trigger is unknown.

Switch to uncompressed 24-bit TGA which bypasses the PNG parser entirely.
tga.mod is already present in the ISO (x86_64-efi/tga.mod).

- Convert bee-logo.png → bee-logo.tga (480018 bytes, BGR top-left)
- config.cfg: insmod png → insmod tga
- theme.txt: bee-logo.png → bee-logo.tga
- Document all prior failed attempts in git-bible/grub-bitmap-error.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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This commit is contained in:

Mikhail Chusavitin

2026-04-30 15:46:13 +03:00

parent 0b8a2ff83f

commit 626763e31d

4 changed files with 136 additions and 2 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

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iso/builder/config/bootloaders/grub-efi/live-theme/bee-logo.tga

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