apm suspend broken ?

apm suspend broken ?

[Pascal Lengard]

Hello,

I read a thread on the mailing list archive about the exact same
problem I am facing now (thread started on Tue Sep 25 2001:
"apm suspend broken in 2.4.10).

I use a Dell latitude C600 and it used to work fine with kernel up
to 2.4.9 (regular kernel from kernel.org).
I upgraded to redhat 7.2 and to kernel 2.4.13+ext3 patches (again
from regular sources), and apm refuses to suspend the beast.

Did someone find a solution for this problem since last thread ?
If no light shined from last thread, I would be happy to help out
on this. I am not a kernel hacker so I guess my help will be limited,
but I do have the hardware ready for testing purposes

Pascal

(please cc me in replies since I am not subscribed to the list)

Re: apm suspend broken ?

[Samuli Suonpaa]

Pascal Lengard <pascal.lengard@wanadoo.fr> wrote:
> I use a Dell latitude C600 and it used to work fine with kernel up
> to 2.4.9 (regular kernel from kernel.org).
> I upgraded to redhat 7.2 and to kernel 2.4.13+ext3 patches (again
> from regular sources), and apm refuses to suspend the beast.

I, byt the way, had my Latitude suspend perfectly with 2.4.12-ac5.
Now, with 2.4.13-ac[34] pressing Fn+Suspend just blanks the screen (it
doesn't shut it off, _just_ blanks it) and hangs the machine.

Any ideas on how to proceed in order to find out where the problem
lies?

Suonpää...

Re: apm suspend broken ?

[Alan Cox]

> I, byt the way, had my Latitude suspend perfectly with 2.4.12-ac5.
> Now, with 2.4.13-ac[34] pressing Fn+Suspend just blanks the screen (it
> doesn't shut it off, _just_ blanks it) and hangs the machine.
> 
> Any ideas on how to proceed in order to find out where the problem
> lies?

Find exactly which -ac it broke in. If you do a binary search through a few
patch levels you should be able to pin it down. At that point I can chase it


Alan

Re: apm suspend broken ?

[Pascal Lengard]

On Tue, 30 Oct 2001, Alan Cox wrote:

> > I, byt the way, had my Latitude suspend perfectly with 2.4.12-ac5.
> > Now, with 2.4.13-ac[34] pressing Fn+Suspend just blanks the screen (it
> > doesn't shut it off, _just_ blanks it) and hangs the machine.
> > 
> > Any ideas on how to proceed in order to find out where the problem
> > lies?
> 
> Find exactly which -ac it broke in. If you do a binary search through a few
> patch levels you should be able to pin it down. At that point I can chase it

I tested "plain" 2.4.12 from Linus and it suffer the same problem.
Pressing Fn+Suspend does nothing on my Dell Latitude C600, so I thought
it would not be usefull to test against 2.4.12-ac. Tell me if I am plain
wrong on this, otherwise, I guess my problem is not exactly the same than 
Samuli Suonpaa's.

>From the last thread on this subject, I could narrow down the problem
between 2.4.9 (working) and 2.4.10 (broken), so I did not test against -ac.
I rather tested against 2.4.10-preXX. I hope this is not a problem.

Sumary:
-------
Hardware: Dell Latitude C600
When apm is broken, pressing Fn+Suspend does nothing and launching "apm -s"
returns "apm: Resource temporarily unavailable".

2.4.9 ==> apm works
2.4.10-pre8 ==> apm works
2.4.10-pre10 ==> apm works
2.4.10-pre11 ==> apm works
2.4.10-pre12 ==> apm broken
2.4.10 ==> apm broken
2.4.12 ==> apm broken 
2.4.13 ==> apm broken

The problem appeared in 2.4.10-pre12. I read the Changelog but it is not 
precise enough for me :-), I started to diff between pre11 and pre12 but
I need a sleep now ... I already compiled to much kernels for tonight !

I am ready to test other things if I can help on this issue.
Where could I get patches between pre11 and pre12 in small chunks to start
some experimentation ?

Pascal

Re: apm suspend broken ?

[Alan Cox]

> 2.4.9 ==> apm works
> 2.4.10-pre8 ==> apm works
> 2.4.10-pre10 ==> apm works
> 2.4.10-pre11 ==> apm works
> 2.4.10-pre12 ==> apm broken

Thanks

I'll have a look when I get some time to poke at APM again

Re: [lkml] Re: apm suspend broken ?

[Ian Soboroff]

Pascal Lengard <pascal.lengard@wanadoo.fr> writes:

> I tested "plain" 2.4.12 from Linus and it suffer the same problem.
> Pressing Fn+Suspend does nothing on my Dell Latitude C600, so I thought
> it would not be usefull to test against 2.4.12-ac. Tell me if I am plain
> wrong on this, otherwise, I guess my problem is not exactly the same than 
> Samuli Suonpaa's.

just for other data points, 2.4.7 (RedHat), 2.4.9 (RedHat), and
2.4.12-ac6 respond OK to Fn-Suspend on my C600.  

occasionally i get a suspend that won't resume correctly; the
framebuffer gets hosed such that it looks like the screen is cut into
vertical strips and rearranged.  but Fn-Suspend works, and i can
resume, and the machine is still running fine (i.e., i can reboot it
if i can maneuver the mouse to a window ;-).

what i've never gotten to work on the C600 is suspend on closing the
lid.  Worked great on my old Latitude CS... gotta love Dell, the cases
look the same but everything inside is a crapshoot.

ian

Re: apm suspend broken ?

[Stephen Rothwell]

Hi Pascal,

On Wed, 31 Oct 2001 02:27:31 +0100 (CET) Pascal Lengard <pascal.lengard@wanadoo.fr> wrote:
>
> 2.4.10-pre11 ==> apm works
> 2.4.10-pre12 ==> apm broken

Can you try the following patch, please?  This is the relevant part of a
patch that was applied to Alan Cox's kernels.
-- 
Cheers,
Stephen Rothwell                    sfr@canb.auug.org.au
http://www.canb.auug.org.au/~sfr/

--- 2.4.14-pre5/drivers/char/pc_keyb.c	Mon Sep 24 05:12:49 2001
+++ 2.4.13-ac5/drivers/char/pc_keyb.c	Tue Oct 30 17:42:28 2001
@@ -34,6 +34,7 @@
 #include <linux/vt_kern.h>
 #include <linux/smp_lock.h>
 #include <linux/kd.h>
+#include <linux/pm.h>
 
 #include <asm/keyboard.h>
 #include <asm/bitops.h>
@@ -397,29 +398,32 @@
 	    return 0200;
 }
 
-void pckbd_pm_resume(void)
+int pckbd_pm_resume(struct pm_dev *dev, pm_request_t rqst, void *data) 
 {
 #if defined CONFIG_PSMOUSE
        unsigned long flags;
 
-       if (queue) {                    /* Aux port detected */
-               if (aux_count == 0) {   /* Mouse not in use */ 
-                       spin_lock_irqsave(&kbd_controller_lock, flags);
-                       /*
-                        * Dell Lat. C600 A06 enables mouse after resume.
-                        * When user touches the pad, it posts IRQ 12
-                        * (which we do not process), thus holding keyboard.
-                        */
-                       kbd_write_command(KBD_CCMD_MOUSE_DISABLE);
-                       /* kbd_write_cmd(AUX_INTS_OFF); */ /* Config & lock */
-                       kb_wait();
-                       kbd_write_command(KBD_CCMD_WRITE_MODE);
-                       kb_wait();
-                       kbd_write_output(AUX_INTS_OFF);
-                       spin_unlock_irqrestore(&kbd_controller_lock, flags);
-               }
+       if (rqst == PM_RESUME) {
+               if (queue) {                    /* Aux port detected */
+                       if (aux_count == 0) {   /* Mouse not in use */ 
+                               spin_lock_irqsave(&kbd_controller_lock, flags);
+			       /*
+				* Dell Lat. C600 A06 enables mouse after resume.
+				* When user touches the pad, it posts IRQ 12
+				* (which we do not process), thus holding keyboard.
+				*/
+			       kbd_write_command(KBD_CCMD_MOUSE_DISABLE);
+			       /* kbd_write_cmd(AUX_INTS_OFF); */ /* Config & lock */
+			       kb_wait();
+			       kbd_write_command(KBD_CCMD_WRITE_MODE);
+			       kb_wait();
+			       kbd_write_output(AUX_INTS_OFF);
+			       spin_unlock_irqrestore(&kbd_controller_lock, flags);
+		       }
+	       }
        }
-#endif       
+#endif
+       return 0;
 }
 
 
--- 2.4.14-pre5/include/asm-i386/keyboard.h	Wed Oct 24 22:05:26 2001
+++ 2.4.13-ac5/include/asm-i386/keyboard.h	Tue Oct 30 17:42:41 2001
@@ -16,6 +16,7 @@
 #include <linux/kernel.h>
 #include <linux/ioport.h>
 #include <linux/kd.h>
+#include <linux/pm.h>
 #include <asm/io.h>
 
 #define KEYBOARD_IRQ			1
@@ -28,7 +29,8 @@
 extern char pckbd_unexpected_up(unsigned char keycode);
 extern void pckbd_leds(unsigned char leds);
 extern void pckbd_init_hw(void);
-extern void pckbd_pm_resume(void);
+extern int pckbd_pm_resume(struct pm_dev *, pm_request_t, void *);
+extern pm_callback pm_kbd_request_override;
 extern unsigned char pckbd_sysrq_xlate[128];
 
 #define kbd_setkeycode		pckbd_setkeycode

Re: apm suspend broken ?

[Pascal Lengard]

Hello Everyone,

Some news about the APM problem on Dell Latitude C600:

On Thu, 1 Nov 2001, Stephen Rothwell wrote:
> Can you try the following patch, please?  This is the relevant part of a
> patch that was applied to Alan Cox's kernels.

I tested this patch against 2.4.10-pre12 (first version showing problem)
and 2.4.13.
I tested also plain 2.4.13-ac5 since you (Stephen) said that this patch
was taken from the last Alan kernel.

Both kernels show the same behaviour, so please read on since 2.4.13-ac5
is impacted by this bug.


I tested the patch against 2.4.10-pre12.
(I had to suppress a line in arch/i386/kernel/dmi_scan.c to make it compile
since it defined pm_kbd_request_override differently than the definition in
keyboard.h) The patch seemed to correct the apm behaviour nicely (I use
'seem' since I tried it only once in a hurry to test against 2.4.13).

So I tested the same patch against 2.4.13. It went through without any
reject, compilation was fine also ... I tested also 2.4.13-ac5 and both
show the same ill behaviour:

Fn+Suspend (or launching "apm -s") does not ALWAYS suspend the laptop. 
Sometimes, it blanks the screen but leaves the lcd light on, the cpu fan is 
on also. Pressing Fn+D to turn off the lcd light completes the job and the 
laptop finaly suspends completely.
Typing "apm -s" shows the same behaviour, it did suspend the laptop ONCE out
of 12 tests, all other 11 tests required to press Fn+D after to suspend.

By the way, If I hit ANY key between Fn+Suspend and Fn+D, the keyboard
is misbehaving after resume: CapsLock is inverted, Ctrl, Shift and Alt
are dead.

Under some rare conditions, apm -s works, but in general, asking the bios 
to turn off the lcd light (Fn+D) helps a lot.
I guess the keyboard problem is not a real one since if "apm -s" did its job 
completely I would no chance to press any key before the lcd light goes off.

Statistically, 2.4.13-ac5 seems to show better luck in suspending (it works
correctly more often than 2.4.13+patch from Stephen).

Pascal

Re: apm suspend broken ?

[Pascal Lengard]

On Fri, 2 Nov 2001, Pascal Lengard wrote:

Hello,

For anyone of interest:

I tested plain 2.4.16 and the problems with APM are still there ...

Fn+suspend does work "sometimes" (1 out of 5 tests)

When it does not work, the laptop is stuck in a state with lcd screen lighted (but all black)
pressing Fn+D to turn off the display works and the apm_suspend finish its job (turning off
all other things like fans ...)

Usually when is suspends, it resumes nicely, but sometimes the laptop reboots
instead of resuming ...  thanks for ext3fs !!

Pascal Lengard

> Some news about the APM problem on Dell Latitude C600:
> 
> On Thu, 1 Nov 2001, Stephen Rothwell wrote:
> > Can you try the following patch, please?  This is the relevant part of a
> > patch that was applied to Alan Cox's kernels.
> 
> I tested this patch against 2.4.10-pre12 (first version showing problem)
> and 2.4.13.
> I tested also plain 2.4.13-ac5 since you (Stephen) said that this patch
> was taken from the last Alan kernel.
> 
> Both kernels show the same behaviour, so please read on since 2.4.13-ac5
> is impacted by this bug.
> 
> I tested the patch against 2.4.10-pre12.
> (I had to suppress a line in arch/i386/kernel/dmi_scan.c to make it compile
> since it defined pm_kbd_request_override differently than the definition in
> keyboard.h) The patch seemed to correct the apm behaviour nicely (I use
> 'seem' since I tried it only once in a hurry to test against 2.4.13).
> 
> So I tested the same patch against 2.4.13. It went through without any
> reject, compilation was fine also ... I tested also 2.4.13-ac5 and both
> show the same ill behaviour:
> 
> Fn+Suspend (or launching "apm -s") does not ALWAYS suspend the laptop. 
> Sometimes, it blanks the screen but leaves the lcd light on, the cpu fan is 
> on also. Pressing Fn+D to turn off the lcd light completes the job and the 
> laptop finaly suspends completely.
> Typing "apm -s" shows the same behaviour, it did suspend the laptop ONCE out
> of 12 tests, all other 11 tests required to press Fn+D after to suspend.
> 
> By the way, If I hit ANY key between Fn+Suspend and Fn+D, the keyboard
> is misbehaving after resume: CapsLock is inverted, Ctrl, Shift and Alt
> are dead.
> 
> Under some rare conditions, apm -s works, but in general, asking the bios 
> to turn off the lcd light (Fn+D) helps a lot.
> I guess the keyboard problem is not a real one since if "apm -s" did its job 
> completely I would no chance to press any key before the lcd light goes off.
> 
> Statistically, 2.4.13-ac5 seems to show better luck in suspending (it works
> correctly more often than 2.4.13+patch from Stephen).
> 
> Pascal
> 
> 

Re: apm suspend broken ?

[Samuli Suonpaa]

Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
>> I, byt the way, had my Latitude suspend perfectly with 2.4.12-ac5. 
>> Now, with 2.4.13-ac[34] pressing Fn+Suspend just blanks the screen
>> (it doesn't shut it off, _just_ blanks it) and hangs the machine.
> Find exactly which -ac it broke in. If you do a binary search
> through a few patch levels you should be able to pin it down. At
> that point I can chase it

I didn't have time to do this earlier, but now:

It seems it broke with 2.4.12-ac4, which I believe updated APM
subsystem from 1.14 to 1.15.

Suonpää...

Re: apm suspend broken ?

[Alan Cox]

> It seems it broke with 2.4.12-ac4, which I believe updated APM
> subsystem from 1.14 to 1.15.

Thanks. That sounds much like my thinkpad, which I now have working again.
If so then it'll work again soon in a 2.4.15pre/16pre

preemption and pccard ?

[Pascal Lengard]

Hello,

I have a problem running kernel 2.4.17 patched with 
http://www.kernel.org/pub/linux/kernel/people/rml/preempt-kernel/v2.4/preempt-kernel-rml-2.4.17-1.patch

First I must say that I run 2.4.17 + international patches (crypto fs)
and freeswan. I know I should test with just preempt to see what happens,
but I have to find time ... and 2.4.17+crypto+freeswan works correctly.

the story:
I patched in this order:
2.4.17+preempt+crypto+freeswan
The symptom is: only slot 00 of pccard works. inserting a card in slot 01
does nothing although yenta_socket reports 2 slots found in /var/log/messages
(I see no difference in logs between working kernel and broken one).

Now I am using a kernel patched in this order:
2.4.17+crypto+freeswan and both slots (00 and 01) behave correctly.

Hardware is dell latitude C600 (with apm problem on standard kernel by the way ...)

Does anyone see some light there ?
Could the symptom really be linked to preempt patch ?
I'd love to see if preempt really is interesting on a laptop ...
If it does interest someone, I could test just 2.4.17+preempt just to see ...


Pascal