The latest xscreensaver has been activating on me in the middle of various
full-screen SDL games, when I use keyboard-only controls. The exact
behavior varies:
armagetron: Full-screen window minimizes (showing the desktop), screen
immediately fades to black, hack starts running
neverball: Game repeatedly pauses of its own volition, but stays up (I
can unpause it each time and continue, but it's bloody annoying); output
from "-verbose -no-capture" indicates unsuccessful attempts to grab the
keyboard and pointer
trackballs: No visible effect on game; same log output as w/neverball
gltron: same as trackballs
Also, on more than one occasion, my mouse cursor disappeared after I quit
the game. Keyboard input worked fine, but there was no pointer, and all
mouse clicks/movement were ignored. I was able to regain the pointer after
xscreensaver kicked on again (much to my relief). I have not been able to
reproduce this behavior reliably; some sort of input grab race condition,
perhaps?
Xscreensaver built from source does not display any of this behavior, and
the program log output indicates /proc/interrupts support---missing from
the Debian-built package. (This is confirmed by the buildd log.)
The configure script checks for /proc/interrupts support with the following
snippet:
AC_CACHE_CHECK([whether /proc/interrupts contains keyboard data],
ac_cv_have_proc_interrupts,
[ac_cv_have_proc_interrupts=no
if grep 'keyboard\|i8042' /proc/interrupts >/dev/null 2>&1 ; then
ac_cv_have_proc_interrupts=yes
fi
])
The buildd, it appears, is working in an environment where the above
condition is false. Passing --with-proc-interrupts to the configure script
doesn't look like it'll do the trick; I believe you'll have to set the
cachevar to bypass the /proc check.
(That, in itself, might be considered a bug---that it is not possible to
build /proc/interrupts support without the actual file unless one resorts
to such subterfuge...)
--Daniel
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