Laptop screen stuck on very low brightness

[Björn Persson]

After I upgraded to Fedora 17 my laptop screen is stuck on a very low 
brightness setting, which makes it very hard to read. It's OK during POST, 
Grub and early Linux initialization, but goes dim before I'm prompted for the 
disk encryption passphrase. After that I can't turn the brightness back up.

Which package should I report this against? Linux? X? Plymouth? Or something 
else?

Björn Persson

[Corey Richardson]

On Thu, 7 Jun 2012 19:20:21 +0200
Björn Persson <bjorn(a)xn--rombobjrn-67a.se&gt; <bjorn(a)xn--rombobjrn-67a.se&gt;
wrote:

>  After I upgraded to Fedora 17 my laptop screen is stuck on a very low
>
>  brightness setting, which makes it very hard to read. It's OK during
>  POST, Grub and early Linux initialization, but goes dim before I'm
>  prompted for the disk encryption passphrase. After that I can't turn
>  the brightness back up.
>   
How are you trying to modify the brightness? Does `xbacklight` work?

>  Which package should I report this against? Linux? X? Plymouth? Or
>  something else?
>   
I believe that would be a kernel issue, depending on where the problem
actually lies.

>  Björn Persson 
-- 
Corey Richardson

[Björn Persson]

Corey Richardson wrote:
>  How are you trying to modify the brightness? 
Holding down Fn and pressing the up and down keys is supposed to adjust the 
brightness. A little box is shown in the middle of the screen with a 
horizontal bar that indicates the brightness. That part still works. The bar 
grows and shrinks, but the brightness is not affected.

>  Does `xbacklight` work? 
All xbacklight commands I try (except for "xbacklight -help") cause the screen 
to flash once and return zero. Even "xbacklight -get" causes a flash, prints 
nothing, and returns zero.

Björn Persson

[Richard Vickery]

I used to get stuck on this one and end up going to "system settings" and
"brightness". This is the first I have heard of the Fn combination;
thanks!!!!

On Thu, Jun 7, 2012 at 4:49 PM, Björn Persson <bjorn(a)xn--rombobjrn-67a.se&gt;wrote:

>  Corey Richardson wrote:
>  > How are you trying to modify the brightness?
>
>  Holding down Fn and pressing the up and down keys is supposed to adjust the
>  brightness. A little box is shown in the middle of the screen with a
>  horizontal bar that indicates the brightness. That part still works. The
>  bar
>  grows and shrinks, but the brightness is not affected.
>
>  > Does `xbacklight` work?
>
>  All xbacklight commands I try (except for "xbacklight -help") cause the
>  screen
>  to flash once and return zero. Even "xbacklight -get" causes a flash,
>  prints
>  nothing, and returns zero.
>
>  Björn Persson
>
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