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Nothing on display after suspend/resume


I am using sidux (based on sid).

I changed my /boot/grub/menu.lst to configure suspend/resume and added
resume=UUID=<swap-uuid> like this ...
The UUID provided belongs to my swap partition which is almost 1GB.

After that, I can suspend my computer using

powersave -u  # -u is for suspend to ram (suspend to disk doesn't work
at all, it just hangs while suspending)

command, but while resuming, I get only a black screen, I see a lot of
activity of my hard-disk and I can hear the fans running, so I think
that resume is working, but there is something with the display.

Any, ideas ?

Below is the relevant parts of /boot/grub/menu.lst

# kopt=root=UUID=353cc61f-ede4-46c1-8d7f-b678de74678a ro quiet vga=791
resume=UUID=25184dd8-abc9-41c8-ae89-7c7ef875fed4  # in case the kernel
is changed

title       Debian GNU/Linux, kernel Default
root        (hd0,4)
kernel      /boot/vmlinuz root=UUID=353cc61f-ede4-46c1-8d7f-
b678de74678a ro quiet vga=791  resume=UUID=25184dd8-abc9-41c8-
ae89-7c7ef875fed4 #for normal resume
initrd      /boot/initrd.img

thanks & regards,

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