I have the same problem after upgrading dapper (kernel 2.6.15) to edgy
(kernel 2.6.17). The splash screen looks ugly, and when the X starts,
switching to consoles with CTRL + ALT + Fx no text can be seen, but only
colorful garbage on screen. Any text typed in the console cannot be seen
at all, even garbled, the screen doesn't change. Switching back to X
works perfectly. Going back to kernel 2.6.15 fixes the problem. I have
found a workaround: passing the parameter vga=0x318 to the kernel 2.6.17
at booting forces a vesa mode 1024x768 16M so the splash screen now
looks fine and texts appears ok in this mode. I suppose other modes also
work fine (I cannot find a vesa mode for my lcd display of 1280x800,
¿anybody knows?). Maybe this problem is caused because the kernel
doesn't initialize text mode framebuffer after booting (at least, not
the same way as the former kernel does). Waiting to see your comments...

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text console garbled from boot up
https://launchpad.net/bugs/63970

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