On 03:35 PM 1/30/00 , Linus Torvalds wrote:
>More suggestions, if you have the time and the energy:
> - disable the keyboard before changing the controller mode in open_aux(),
> and re-order the operations, ie make the init sequence look like this:
>
> kbd_write_command_w(KBD_CCMD_MOUSE_ENABLE); send_data(KBD_CMD_DISABLE);
> kbd_write_cmd(AUX_INTS_ON);
> send_data(KBD_CMD_ENABLE);
> aux_write_ack(AUX_ENABLE_DEV);
Hi Linus,
Ok, I did some more testing, and my statement about the above code making
no difference is not correct. It appears that as long as I have irq 12 manually
assigned to something in the bios, I don't get any lockups if there is no ps/2
mouse connected when gpm attempts to open /dev/psaux. Here are the results of
my latest testing:
stock 2.2.14:
- locks up no matter what if no mouse connected when /dev/psaux opened
2.2.14 with the above init sequence:
- locks up if irq 12 is not manually assigned to a device in the bios
- if irq 12 is assigned, no lockup occurs.
stock 2.3.41:
- locks up if irq 12 is not manually assigned to a device in the bios
- if irq 12 is assigned, no lockup occurs.
I didn't try 2.3.41 with the above init sequence change, since it seems not to
lockup if irq 12 is assigned. Here's how I currently have the irq's assigned
in the bios:
current old
PIRQ_0 3 3
PIRQ_1 11 9
PIRQ_2 12 11
PIRQ_3 5 5
It seems to me that this is a bios bug, or at least a bios quirk.
-Harold
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