Kernel Bug Tracker – Bug 15710
NumLock LED stays on after PC poweroff.
Last modified: 2010-10-28 18:15:49 UTC
After I shutdown/poweroff my PC, the NumLock LED on the keyboard stays on. This started happening only since the stable kernel 2.6.33, never before. The keyboard is an old standard PS/2 102-key model, no multimedia keys. The motherboard is a new ASUS M2N68 (AMD AM2+ based). I am using the default keyboard kernel driver (builtin) - CONFIG_KEYBOARD_ATKBD, x86 32bit. Kernel 18.104.22.168 still has the problem.
I do not see many changes to PS/2 in 2.6.33. Could you please try reverting commit 4a299bf591bc5bef3bde8316e603b9eaec5a7696? If this does not help then I am afraid you need to try and isolate the breakage to a particular -rc kernel...
Yes, I fetched the patch from here: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=4a299bf591bc5bef3bde8316e603b9eaec5a7696
I reverted only this part of the change:
@@ -836,7 +837,7 @@ static void atkbd_cleanup(struct serio *serio)
struct atkbd *atkbd = serio_get_drvdata(serio);
- ps2_command(&atkbd->ps2dev, NULL, ATKBD_CMD_RESET_BAT);
+ ps2_command(&atkbd->ps2dev, NULL, ATKBD_CMD_RESET_DEF);
It DOES fix the problem, the LED turns OFF.
Here are more kernel messages about my keyboard in case you wish to distinguish keyboards and to send them different commands:
PNP: PS/2 Controller [PNP0303:PS2K] at 0x60,0x64 irq 1
PNP: PS/2 appears to have AUX port disabled, if this is incorrect please boot with i8042.nopnp
serio: i8042 KBD port at 0x60,0x64 irq 1
input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input2
Hm, ATKBD_CMD_RESET_BAT woudl indeed turn off the LED, however I am surprised that we keep keyboard powered after shutdown. Do you have something similar to "wakeup on keypress" enabled in BIOS?
Rafael, do you know if we normally keep keyboards powered?
I have specifically disabled all "Wake up on <device>" in the BIOS. This is a desktop machine, I wish all devices to be really powered down at shutdown.
Maybe the device driver can't check the BIOS setting therefore leaves keyboard powered up in case it is needed for the wakeup function?
(In reply to comment #3)
> Hm, ATKBD_CMD_RESET_BAT woudl indeed turn off the LED, however I am surprised
> that we keep keyboard powered after shutdown. Do you have something similar to
> "wakeup on keypress" enabled in BIOS?
> Rafael, do you know if we normally keep keyboards powered?
Not intentionally, at least.
We've had some ACPI changes that might be related to that, but they were committed during the 2.6.34 merge window.
aceman, can you attach the contents of /proc/acpi/wakeup, please?
Device S-state Status Sysfs node
PS2K S4 disabled pnp:00:0a
UAR1 S4 disabled pnp:00:0c
NSMB S4 disabled pci:0000:00:01.1
USB0 S4 disabled pci:0000:00:02.0
USB2 S3 disabled pci:0000:00:02.1
US15 S4 disabled pci:0000:00:04.0
US12 S3 disabled pci:0000:00:04.1
NMAC S5 disabled pci:0000:00:0a.0
P0P1 S4 disabled pci:0000:00:08.0
HDAC S4 disabled pci:0000:00:07.0
BR10 S4 disabled pci:0000:00:0b.0
BR11 S4 disabled pci:0000:00:0c.0
BR12 S4 disabled pci:0000:00:0d.0
*** This bug has been marked as a duplicate of bug 15770 ***