Go Back   DaemonForums > OpenBSD > OpenBSD General

OpenBSD General Other questions regarding OpenBSD which do not fit in any of the categories below.

Thread Tools Display Modes
  #1   (View Single Post)  
Old 23rd July 2009
zer0x zer0x is offline
New User
Join Date: Jul 2009
Posts: 2
Default LCD Backlight Trouble

Hi all,

I have a spare machine running OpenBSD with an integrated LCD panel (so I can't turn the screen off without a screwdriver!). I seem to be unable to disable the LCD backlight. No matter what I try, the screen will blank but the backlight remains permanently on.

Both dpms via xset and wsconsctl do nothing but blank the screen, and xrandr's --off has no effect (as well as only reporting 'default' output).

I have had similar problems in Linux, the solutions being to use the nvidia blob, or vbetool in console.

The machine is still on 4.4 RELEASE, and I will be trying a recent snapshot soon, but I am not really expecting that to improve the backlight situation.

Someone did suggest that setting an absurd modeline e.g. 1hz refresh rate, would cause the screen to turn off due to no signal, but that seems like a very dirty solution if at all. Saying that, I am getting quite desperate, and very much appreciate the suggestion!

I was just wondering if anyone might have any other suggestions or comments before I consider switching it back to Linux or grabbing the screwdriver?


Attached Files
File Type: txt dmesg.txt (5.2 KB, 34 views)
Reply With Quote
  #2   (View Single Post)  
Old 23rd July 2009
Carpetsmoker's Avatar
Carpetsmoker Carpetsmoker is offline
Real Name: Martin
Tcpdump Spy
Join Date: Apr 2008
Location: New Zealand
Posts: 2,206

Your BIOS is version 2001, the latest version from the sony site is 2003V2, you might want to try updating the BIOS.

UNIX was not designed to stop you from doing stupid things, because that would also stop you from doing clever things.
Reply With Quote
  #3   (View Single Post)  
Old 23rd July 2009
BSDfan666 BSDfan666 is offline
Real Name: N/A, this is the interweb.
Helpful companion
Join Date: Apr 2008
Location: Ontario, Canada
Posts: 2,223

Newer versions (..>= 4.6) of OpenBSD will support acpivideo(4).. no man page exists for it yet though.

This will allow you to control such things, presumably.


Hope that helps.
Reply With Quote
  #4   (View Single Post)  
Old 24th July 2009
zer0x zer0x is offline
New User
Join Date: Jul 2009
Posts: 2
Smile Oops!


Very true! Apologies, I really should have thought of that! Now I just need to work out how to do the update without Windows! <Hands Trout to self for slapping purposes>.


That looks very promising! I'll be trying out a 4.6 snapshot ASAP.

Thank you both very much for your time!
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
trouble with binat routing SystemDog OpenBSD General 3 21st December 2009 04:01 PM
dd+user=trouble graudeejs FreeBSD Security 4 26th September 2008 03:48 PM
Trouble with ZFS switch dewarrn1 FreeBSD General 2 11th September 2008 11:58 PM
Trouble with ftp with pf enabled kasse FreeBSD General 8 24th August 2008 11:25 PM
Firewire trouble - Please help! cssgalactic FreeBSD General 13 25th June 2008 08:24 PM

All times are GMT. The time now is 06:14 AM.

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Content copyright © 2007-2010, the authors
Daemon image copyright ©1988, Marshall Kirk McKusick