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Old 23rd July 2009
zer0x zer0x is offline
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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?

Cheers,

zer0x
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Old 23rd July 2009
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Carpetsmoker Carpetsmoker is offline
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Your BIOS is version 2001, the latest version from the sony site is 2003V2, you might want to try updating the BIOS.

http://support.vaio.sony.eu/computin...aspx?m=VGC-V2M
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Old 23rd July 2009
BSDfan666 BSDfan666 is offline
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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.

http://marc.info/?l=openbsd-cvs&m=124398947305804&w=2

Hope that helps.
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Old 24th July 2009
zer0x zer0x is offline
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@Carpetsmoker:

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>.

@BSDfan666:

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

Thank you both very much for your time!
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