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When using pvgrub in graphical mode with vnc, the grub timeout doesn't
work: the countdown doesn't even start. With a serial terminal the
problem doesn't occur and the countdown works as expected.
It turns out that the problem is that when using a graphical terminal,
checkkey () returns 0 instead of -1 when there is no activity on the
mouse or keyboard. As a consequence grub thinks that the user typed
something and interrupts the count down.
To fix the issue simply ignore keystrokes returning 0, that is the NUL
character anyway. Add a patch to grub.patches to do that.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Tested-by: Steven Haigh <netwiz@crc.id.au>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
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