acertimeline team mailing list archive

[Sean Russell <seanerussell@xxxxxxxxx>]

I've seen this on every LCD that I've owned.  My G1 does this; my Palm Treo
did this.  If you lower the voltage on the LCD low enough, there's some
capacitance effect that causes the screen to "throb".  Under Windows, the
granularity was low enough that the step above "off" was high enough to not
trigger this behavior; for some reason, under Ubuntu the granularity is
*much* higher, and I see a far greater number of levels of brightness, many
of which are very close to 0.  The closer I get to 0, the more pronounced
the flickering.  Above some brightness threshold (15%?) the effect goes
away.

But, again... I've seen this on every LCD I've had that lets me turn the
brightness all the way down to 0 with sufficient granularity; it isn't an
ACER thing.

Finally, when I set the backlight control to anything other than legacy, I
can bork the display.  For one thing, the screen brightness responds much
more slowly to events, and they queue up.  For another, at least once I
turned the brightness all the way down and couldn't get it to come back up.
So, now I leave it in legacy mode, which works.

--- SER

On Mon, Jun 29, 2009 at 11:35 AM, Albert Vilella <avilella@xxxxxxxxx> wrote:

>
>
> On Mon, Jun 29, 2009 at 11:46 AM, <boris.kairat@xxxxxxxxxxxxxxxxx> wrote:
>
>>
>> Hi @all!
>> In the meantime I installed Ubuntu 9.04 64BIT (2.6.28-11) on my 3810T
>> (Intel Core2 Solo; 4GB) and boot with option: libata.noacpi=1.
>> Now I have the following problems:
>>
>> 1. If you dimm the display to darkest (or nearly darkest) setting it
>> starts to flicker.
>
>
> That's funky. Can you report this as a bug in bugs.launchpad.net?
> Is it corrected if you try to run these commands?
>
> xrandr --output LVDS --set BACKLIGHT_CONTROL legacy
>
> xrandr --output LVDS --set BACKLIGHT_CONTROL native
>
>
>>
>> 2. On battery the fan starts every 30 seconds - also if the cpu und the
>> hdd have nothing to do.
>> 3. System shuts down instead of resuming.
>> 4. The battery runs the system about 4 hours - not 8.
>>
>> Any further help would be appreciated...
>> Greetings from Germany!
>>
>>
>>
>>
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