[CentOS] LCD blanks out overnight

Joe Tseng joe_tseng at hotmail.com
Tue Sep 9 14:05:39 UTC 2008


I know my laptop didn't crash because I'm able to put it into suspend mode.  Thanks for the tip; I'll try it out.

I also changed my BIOS and told it to disable power savings when plugged in.  Maybe one of the two will help...

> Date: Tue, 9 Sep 2008 06:57:44 -0700
> Subject: Re: [CentOS] LCD blanks out overnight
> From: centos at linuxpowered.net
> To: centos at centos.org
> 
> Joe Tseng wrote:
> > I inherited an ancient Dell Latitude C840 and recently installed CentOS 5.2
> > on it.  It worked fine for the most part, but when I left it overnight and
> > came back the next morning, the screen blacked out and wouldn't come back
> > unless I did a hard reset.  Even though I turned off all the power
> > management settings and left it set like a desktop, the next morning after
> > that it still blacked out.  I thought maybe it'd come back if I switched
> > from X to a virtual text console, but that didn't do the trick.  Has anyone
> > seen this and what do I do to fix it?
> 
> Is the machine still responsive? e.g. does the caps light key work? Or
> is it frozen solid?
> 
> I don't know how many laptops it affects but my previous Toshiba laptops
> had problems where if the screen went into power save mode about 70% of
> the time the only way to get it to turn back on was to either reboot the
> box or put it in suspend/sleep/hibernate and wake it up again. Toshiba
> said this was a common problem across vendors that used multiple cores
> in their laptops.  Microsoft released a fix for it for XP about a year
> and a half ago(though as the fix was a specialized fix not a generic
> fix that was pushed out to users I didn't realize it until after I
> switched off of XP and onto Ubuntu, took a while until a version
> of Ubuntu came out that could suspend/resume on that system). I could
> not find any related fix for X11, so I just disabled screen blanking
> in the X server.
> 
> It's been a while and I don't have that laptop anymore but what
> I believe I did was add
> 
> Options "-DPMS"
> 
> To the monitor section of xorg.conf, see the man page for xorg.conf
> for other DPMS related options.
> 
> Of course that just turns off screen blanking/power off, if your
> system is crashing, that's another topic..

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