Resume from suspend-to-ram

[Giridhar Pemmasani <giri-IxWJ8JVbGpr5NRxSJurNR4dd74u8MsAO@public.gmane.org>]

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I have already posted the following message to LKML. However, since there
was lot of discussion on this topic in this mailing list, I am posting here
too. 

I have Dell Latitude D600 laptop with Radeon R250 Lf (Mobility 9000
M9) video card. I have been trying to get suspend-to-ram work with
this laptop since 2.5.70 or so. The problem almost always was that if
frame buffer (I have tried radeon and vesa) is used, resume won't
finish - it would hang right after pressing power button and if plain
console is used resume works fine, but the LCD stays off.

Since new radeonfb has suspend/resume driver model, I thought I might
give it a try, but still the laptop would hang during resume. With a
bit of trial and error (and some guess work), I got the laptop to
resume successfully with the following patch.

--- radeon_pm.c.orig    2004-02-20 15:11:18.000000000 -0500
+++ radeon_pm.c 2004-02-20 15:12:23.000000000 -0500
@@ -907,11 +907,13 @@
 
        /* Restore display & engine */
        radeonfb_set_par(info);
-       fb_pan_display(info, &info->var);
-       fb_set_cmap(&info->cmap, 1, info);
+       /* fb_pan_display(info, &info->var);
+        * fb_set_cmap(&info->cmap, 1, info);
+        */
 
        /* Refresh */
-       fb_set_suspend(info, 0);
+       /* fb_set_suspend(info, 0);
+        */
 
        /* Unblank */
        rinfo->lock_blank = 0;


Right now after resume, console still remains blank, but X restores
the screen properly. Note that since frame buffer is not restored
properly, the console is pretty much useless, but it is not a problem
for me as I use X all the time.

I have used this patch with kernel 2.6.3-mm2. I haven't tried 2.6.3,
but I think it may work with 2.6.3 too.

I am also attaching config.bz2 and /etc/acpi/sleep (the script used to
suspend the laptop). 

I am not subscribed to LKML, so please CC me.


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