From: Bill Gatliff <bgat@billgatliff.com>
To: linux-fbdev-devel@lists.sourceforge.net
Subject: Framebuffer "hangs" at startup
Date: Tue, 17 Oct 2006 21:43:49 -0500 [thread overview]
Message-ID: <453594E5.4060606@billgatliff.com> (raw)
Guys:
Bear with me, this one is a bit tricky to describe... :)
I'm testing a 2.6.12 kernel and a 2.6.18.1 kernel, and a few in between,
and they all do it. All on ARM targets: PXA255 with onboard LCD
framebuffer, and AT91RM9200 with an S1D13xxx framebuffer. Duplicated
with Qt 4.x and SDL 1.2-debian.
The first time I start up a framebuffer-based application, say Qt or
Antigrain/SDL, things appear to go fine. But if I abort said program
with a CTRL-C and restart it, then the application appears to start up
fine but there's no screen output. I don't see any output until I do a
CTRL-Z and then restore the program to the foreground with "fg". Then
the screen clears and things start drawing as usual. The screen also
draws if I do a CTRL-C instead of -Z, but then the program aborts as you
would expect.
If I'm running the program under strace then the screen never recovers
whether I do a CTRL-Z or not. I see the code hanging in an
ioctl(KGDKBENT) on /dev/tty8.
Honestly, I'm totally stumped. Anyone have any suggestions?
b.g.
--
Bill Gatliff
bgat@billgatliff.com
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reply other threads:[~2006-10-18 2:43 UTC|newest]
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