06-18-2014
I recommend that you take a look at the settings (eg, console redirection, serial comms, etc) but don't be tempted to start changing things en masse.
As you said, both machines were working, you worked on the hardware, and now both have the same problem. Logic says that it's something you've done. This hardware has interlocks to protect the hardware (eg, it knows if a fan isn't running) so leaving one tiny cable unplugged could do something like this.
Are the processors properly seated and locked down? Stuff like that.
All too often an IT fault is responded to by reinstalling the O/S, reinstalling the app that errored, completely restoring a filesystem, and other too drastic responses like that turning the one original problem into a multitude of problems that then take ages to fix. My advice is don't be tempted but retrace your steps.
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LEARN ABOUT SUSE
request_scroll
request_scroll(3alleg4) Allegro manual request_scroll(3alleg4)
NAME
request_scroll - Queues a hardware scroll request with triple buffering. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
int request_scroll(int x, int y);
DESCRIPTION
This function is used for triple buffering. It requests a hardware scroll to the specified position, but returns immediately rather than
waiting for a retrace. The scroll will then take place during the next vertical retrace, but you can carry on running other code in the
meantime and use the poll_scroll() routine to detect when the flip has actually taken place.
Triple buffering is only possible with certain drivers: you can look at the GFX_CAN_TRIPLE_BUFFER bit in the gfx_capabilities flag to see
if it will work with the current driver.
RETURN VALUE
This function returns zero on success, non-zero otherwise.
SEE ALSO
poll_scroll(3alleg4), request_video_bitmap(3alleg4), gfx_capabilities(3alleg4), scroll_screen(3alleg4)
Allegro version 4.4.2 request_scroll(3alleg4)