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Screen goes blank on me
I have a problem with NetBSD 5.1_RC4, not new to this RC4, of screenblank
kicking in unwanted, after about 30 seconds of keyboard inactivity, and it
doesn't come back in response to typing any key. Only way I can get it back is
to go to another virtual terminal blind, login as root if I haven't logged in
already, and type
without seeing anything on the screen.
Also, when I go into X and then come back (quitting twm, I haven't installed
anything else yet), all I can see on the screen is a rectangular cursor, and
haven't found any way to get the screen back except by rebooting; "screenblank
-u" doesn't work. Only thing that works is type
shutdown -r now
without seeing anything on screen; that gets me out. So the command-line
interface remains functional but invisible. Ctrl-L doesn't work.
This screen going blank never happened when booting the installation CD.
I think I had this problem with NetBSD 4.0.1 running on a 4 GB USB stick, but
setting screenblank=NO in /etc/rc.conf seems to have fixed it. I was even able
to go into X with twm and come back to a working screen.
I have screenblank=NO in /etc/rc.conf and would like to know what I need to do
to get screenblank to behave properly, or failing that, disable screenblank
completely. I've looked in the source code in /usr/src/usr.sbin/screenblank
Some things I haven't tried yet are:
1. Rename /usr/sbin/screenblank to screenblank-bad so it won't be found.
2. kill (or pkill?) -9 screenblank
3. chmod -x /usr/sbin/screenblank # render it nonexecutable
Could this be related to my devious means of booting NetBSD, using a 30 MB
giant floppy image, ffsv1 file system, including netbsd kernel and made
bootable using installboot? I boot into FreeDOS and boot this image using
grub4dos. Since NetBSD 5.0.2, I get "Not a bootxx image" when trying to boot
NetBSD normally, even after using installboot. Also, dosboot.com would hang
shortly into the boot, on the first line of screen output.
I do this also with NetBSD 4.0.1 because my BIOS, dating to 2001, does not
support booting from USB. I can also boot this USB stick from FreeDOS using
dosboot.com, and have also booted this USB stick using FreeDOS, grub4dos and
loading PLoP boot manager (http://www.plop.at/).
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