To begin with, thank you for your answer.

Well, Acer Aspire 3003LMi has SiS M760GX graphics chipset (which I had
not been able to get 3D-acceleration from from any distribution). For
SiS M760GX, I use the drivers that came with SL6.2. I use the default
desktop for SL6.2 (GNOME). The problem with suspend-resume is there,
both with screen locking or not. Hibernation worked ok last time I
checked, the problem is with suspend (to RAM) and resume.

On Thu, May 3, 2012 at 6:14 PM, zxq9 <[log in to unmask]> wrote:
> On 05/04/2012 12:01 AM, Stavros Filippidis wrote:
>>
>> I use Scientific Linux 6.2 with my laptop Acer Aspire 3003LMi and
>> suspend-resume does not work for me! Laptop seems to suspend ok, but
>> when resuming, the monitor displays either black screen or green lines
>> that move on a black screen, the caps lock does not change the
>> respective led, and sometimes a led is blinking!
>>
>> Could you advice me with steps for troubleshooting this?
>
>
> This is very often related to graphics driver problems and the way they
> (don't) work well with X.
>
> For someone to help you out you'll need to let everyone know:
> 1. What graphics chipset does your laptop have?
> 2. What drivers are you using (the ones that came with SL6.2, homespun or
> proprietary)
> 3. What desktop environment are you using?
> 4. Do you have graphic accelerated screensavers running as part of the
> wait-idle-suspend cycle?
> 5. Do you have screen locking enabled from blank screen or suspend?
> 6. Is you computer suspending or hibernating?
>
> With that information someone will probably stand a decent chance of helping
> you out -- even if its just to say "hopeless; turn off suspension/sleep".