CUSL2-C won't do keyboard boot
 

Hi,

I have a system based on the Asus CUSL2-C board here (without both of
onboard audio and vga) which has the following problem:

If I switch on the system via the power button on the case everything
works as expected, after I shutdown the system but do not cut the power
I can also power on the system via the configured keyboard combination
(Ctrl-Esc).

When the power was cut (e.g. by flipping the power switch of the ATX
power supply on the back), booting by keyboard won't work. Sometimes
even an immediately following boot via the power button on the case
doesn't work properly when I tried Ctrl-Esc before (system puts me in
the BIOS with some warning about core voltage and overclocking).

The CPU is operating at the intended frequency and I have no intention
to overclock the system.

Is there some way I could get the system to boot from keyboard? I have
already tried to switch the power supply - same results as above.
Should I try to disable the overclocking features?

Thanks for any input on this issue.

Thomas Jahns
--
"Computers are good at following instructions,
but not at reading your mind."
D. E. Knuth, The TeXbook, Addison-Wesley 1984, 1986, 1996, p. 9

On 17 Dec 2004 14:06:59 +0100, Thomas Jahns
wrote:

Hi,

I have a system based on the Asus CUSL2-C board here (without both of
onboard audio and vga) which has the following problem:

If I switch on the system via the power button on the case everything
works as expected, after I shutdown the system but do not cut the power
I can also power on the system via the configured keyboard combination
(Ctrl-Esc).

When the power was cut (e.g. by flipping the power switch of the ATX
power supply on the back), booting by keyboard won't work. Sometimes
even an immediately following boot via the power button on the case
doesn't work properly when I tried Ctrl-Esc before (system puts me in
the BIOS with some warning about core voltage and overclocking).

The CPU is operating at the intended frequency and I have no intention
to overclock the system.

Is there some way I could get the system to boot from keyboard? I have
already tried to switch the power supply - same results as above.
Should I try to disable the overclocking features?


When you cut off the power on the PSU backside you cannot use wake-up
features.

That is the whole idea:atx power supplies never switch totally off.
They still have power on keyboard and mouse.

So it also important never to pull out mouse and keyboard from a
computer where amin power has not been cut off. This might burn the
PS/2 ports.

Especially asus-board can burn these ports. Maybe there are some small
smd-mounted-fuses inside the ps/2 housings, - but I couldn't repair
it.

So beware of that !

best regards

John

"JK (at mail dot dk)" writes:
When you cut off the power on the PSU backside you cannot use wake-up
features.

Perhaps I should have been more verbose, the events are this:

1. System plugged into wall socket, PSU power switch (the one at the
back of the system) switched off (accordingly no power to cusl2 c)
2. I switch on the PSU power switch (the system is now in standby, the
leds on the keyboard light for a moment and the led in the optical
mouse continues to glow until I switch off the system at the back
again).
3. I try to get the system up by pressing Ctrl-Esc (but it doesn't work)
4. I press the case power button, system comes up as expected
5. Once the system is fully booted, I bring it down to soft power-off
(so the fans are off etc. but there is still power to the mainboard
and mouse led is still glowing)
6. If I press Ctrl-Esc now, the system boots (as I would have expected
in 3.)

Between steps 3. and 6. I do of course not change anything in the BIOS
Setup or the system's ACPI setup.

I think this might be BIOS related. At least my P2B-F had a similar
symptom (would start up in step 3. but not in 6., needed to cut power on
the back of the system for Ctrl-Esc to work again). Unfortunately while
on P2B-F this was cured by BIOS 1012 and up (IIRC), the CUSL2 C is
already flashed with the latest BIOS.

That is the whole idea:atx power supplies never switch totally off.
They still have power on keyboard and mouse.

I know that.

So it also important never to pull out mouse and keyboard from a
computer where amin power has not been cut off. This might burn the
PS/2 ports.

I'm aware of that but have never succeeded in destroying a PS/2
keyboard/mouse device (I'm a master at wrecking tape drives but in now 20
years of computing have not had a single hard disk fail me, at least
during the time the corresponding system was still actively used).

Especially asus-board can burn these ports. Maybe there are some small
smd-mounted-fuses inside the ps/2 housings, - but I couldn't repair
it.

These would be placed on the PCB.

So beware of that !

I do.

Thomas Jahns
--
"Computers are good at following instructions,
but not at reading your mind."
D. E. Knuth, The TeXbook, Addison-Wesley 1984, 1986, 1996, p. 9

"Thomas Jahns" ???
???...
"JK (at mail dot dk)" writes:
When you cut off the power on the PSU backside you cannot use wake-up
features.


Thomas, I had the same mobo and no trouble.

1. check that the KBPWR jumper is set to on.
2. check in bios that you assigned that key combination to pwr on computer,
I think it's under power management.
3. what you stated as soft boot isn't soft boot, fans don't turn off at soft
boot. Softboot = ctrl-alt-del. What you did was suspended the computer and
any key pressed would've bring it back.
4. I also find that I cannot keyboard power-on the machine the first time
ATX is on. It only works after at least 1 shutdown.

"Bronney Hui" writes:
"Thomas Jahns" ???
???...
"JK (at mail dot dk)" writes:
When you cut off the power on the PSU backside you cannot use wake-up
features.


Thomas, I had the same mobo and no trouble.

while below you state that you had the exact same problem.

1. check that the KBPWR jumper is set to on.

Check.

2. check in bios that you assigned that key combination to pwr on computer,
I think it's under power management.

Check.

3. what you stated as soft boot isn't soft boot, fans don't turn off at soft
boot. Softboot = ctrl-alt-del. What you did was suspended the computer and
any key pressed would've bring it back.

I never called it soft boot. I called it soft power-off (by which I mean
that at the end of the shutdown, the computer will power off anything
that isn't on standby power) but perhaps there is a nice term from some
ATX design document.

4. I also find that I cannot keyboard power-on the machine the first time
ATX is on. It only works after at least 1 shutdown.

Okay, so I'm not alone at least. Maybe I'm a little more afraid of a
system constantly on (computers can set your house on fire, you know
that?), so this first time is practically every time I turn on the
system and it's just annoying.

Thomas Jahns
--
"Computers are good at following instructions,
but not at reading your mind."
D. E. Knuth, The TeXbook, Addison-Wesley 1984, 1986, 1996, p. 9