If you are using Ubuntu (9.04 in my case) on your laptop and facing some problem with sleep and resume work, you may check your graphic chipset driver.

I’m using P55 Intel centrino laptop from Samsung, which has several problems with linux. And one of the problem is about power management. PM is quite critical issue in mobile world. Actually my laptop with Ubuntu didn’t get up properly from sleep mode all the time from the beginning. I was wondering what the heck is going around in there, and incidentally or accidentally I tried to connect through ssh from other linux box, and found that it makes connection even though my laptop’s display is dead black. So, it means that my laptop has successfully woke up except for display subsystem.

Actually for some reasons, I was using the default display driver. Because some reports said to me that it is not safe and should have some problem with sleep and resume if I use proprietary drivers. But who was right? I’m not sure…it could be happening only to me. Using default display driver caused problems with sleep-resume work. So I made it call to use Nvidia proprietary driver which is reported to be making some issues with brightness control. and I could solve the sleep-resume problem. Even though I need to make my laptop to go sleep mode at least one time, it worth to try.

So, I’m leaving simple procedure to solve sleep-resume problem on laptop. Try this if other solution on the way doesn’t go well.

Get Nvidia proprietary glx driver (for now ver.. 180.xx is latest and recommended)

~$ sudo apt-get install nvidia-glx-180

reboot after driver install complete

Try to make selection with H/W drivers like following (If any other way is possible, please let me know)

/usr/bin/python /usr/bin/jockey-gtk

You can see NVIDIA Graphic….(version 180) [Recommended]. Select that and press Activate button bellow the window.

And you probably reboot your system.

Now you have your laptop display backlight uncontrollable. Don’t try to fix it using backlight adjustment shortcut button or something like that. It won’t be working. To make your backlight in 100% bright,

1. Just press “Fn and Esc” keys to make your laptop sleep. Or any other way your laptop supports for sleep mode will be cool.

2. Press power button to make your laptop resume from sleep mode.

You will have your laptop display backlight 100% bright and your laptop will have no problem with resuming back from sleep mode as well

Cheers,

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