LCD blanking?

LCD blanking?

[Gary Thomas]

I have a system with an LCD, running Tomi's DSS2 support.
One problem I'm having is that after a while, the LCD blanks
out (I do have fbcon support enabled so I can use it as a
glass TTY - no keyboard)

How can I keep this from happening?
Once it does, is there any way to get it back on (remember,
no keyboard)?

Thanks

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------

Re: LCD blanking?

[Cliff Brake]

On Tue, Aug 25, 2009 at 9:55 AM, Gary Thomas<gary@mlbassoc.com> wrote:
> I have a system with an LCD, running Tomi's DSS2 support.
> One problem I'm having is that after a while, the LCD blanks
> out (I do have fbcon support enabled so I can use it as a
> glass TTY - no keyboard)
>
> How can I keep this from happening?
> Once it does, is there any way to get it back on (remember,
> no keyboard)?

There are ways to do this from user space, but a quick hack I sometimes use is:

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 60359c3..eda7c14 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -172,7 +172,8 @@ int do_poke_blanked_console;
 int console_blanked;

 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
-static int blankinterval = 10*60*HZ;
+//static int blankinterval = 10*60*HZ;
+static int blankinterval = 0;
 static int vesa_off_interval;

Cliff

=================
http://bec-systems.com

Re: LCD blanking?

[Frederik Kriewitz]

On Tue, Aug 25, 2009 at 3:55 PM, Gary Thomas<gary@mlbassoc.com> wrote:
> I have a system with an LCD, running Tomi's DSS2 support.
> One problem I'm having is that after a while, the LCD blanks
> out (I do have fbcon support enabled so I can use it as a
> glass TTY - no keyboard)
>
> How can I keep this from happening?
> Once it does, is there any way to get it back on (remember,
> no keyboard)?

check man console_codes

RE: LCD blanking?

[Hiremath, Vaibhav]

> -----Original Message-----
> From: linux-omap-owner@vger.kernel.org [mailto:linux-omap-
> owner@vger.kernel.org] On Behalf Of Frederik Kriewitz
> Sent: Wednesday, August 26, 2009 6:07 AM
> To: linux-omap@vger.kernel.org
> Subject: Re: LCD blanking?
> 
> On Tue, Aug 25, 2009 at 3:55 PM, Gary Thomas<gary@mlbassoc.com>
> wrote:
> > I have a system with an LCD, running Tomi's DSS2 support.
> > One problem I'm having is that after a while, the LCD blanks
> > out (I do have fbcon support enabled so I can use it as a
> > glass TTY - no keyboard)
> >
> > How can I keep this from happening?
> > Once it does, is there any way to get it back on (remember,
> > no keyboard)?
> 
[Hiremath, Vaibhav] The default console timeout is 10 min, so after this time LCD will blank, from user space you can do following - 

SYSFS entry - 
# echo 0 > /sys/class/graphics/fb0/blank

IOCTL - 

You can call the ioctl FBIOBLANK with argument FB_BLANK_UNBLANK.

Thanks,
Vaibhav

> check man console_codes
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