[opensuse-factory] Force disable LVDS Downclock on intel graphics?

27 Jul 2012

      Hello,

I am running Tumbleweed off openSUSE 12.1.

In the past i used "i915.lvds_downclock=1" as a power saving measure
on my laptop, but realised that it caused annoying screen flickering
and made it impossible to use an external display. So i disabled this
option and have had a functioning laptop since then.

However since i ran zypper dup last week and updated the kernel to
3.4.6-34, this display instability has returned.

When i plug in an external monitor via HDMI (or VGA) i can sometimes
use it for a couple of minutes before the graphics card starts
switching the output between displays and flickering, rendering it
impossible to use. It is often worse if i only use the external
display (i.e. disable laptop display).

I suspect this is due to some kernel change which has allowed the lvds
downclock power saving measure to work (i.e. without being forced).
Can anyone confirm this?

Also can i force disabling this option by entering in
"i915.lvds_downclock=0" at the kernel line?

Thanks in advance,
Trent
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Trent Hawkins

Jiri Slaby

Trent Hawkins

Trent Hawkins

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