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-   -   Bug#681743: i915: display backlight brightness initially set to zero on boot (http://www.linux-archive.org/debian-kernel/684120-bug-681743-i915-display-backlight-brightness-initially-set-zero-boot.html)

Jonathan Nieder 07-16-2012 11:45 AM

Bug#681743: i915: display backlight brightness initially set to zero on boot
 
Gedalya wrote:

> Using an HP dm4t-1200 laptop.
> The backlight is set to zero brightness as soon as the kernel begins to load.
> In my case I can set the brightness higher by simply using the appropriate fn
> key combination, but until then everything looks black.
>
> It looks to me like the following is the fix:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=7bd90909bbf9ce7c40e1da3d72b97 b93839c188a
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=4dca20efb1a9c2efefc28ad2867e5 d6c3f5e1955

Thanks!

I'll try to find some moments to look into this this week. If I don't get
back to you soon, feel free to ping me. Those commits are both in 3.5-rc1,
so if you get a chance to test 3.5-rc1 or newer, that would also be useful.

Hope that helps,
Jonathan


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Gedalya 07-19-2012 06:57 AM

Bug#681743: i915: display backlight brightness initially set to zero on boot
 
Tested 3.5.0-rc7+, boots up the same way, with the backlight off. Adding
i915.invert_brightness=1 makes it turn the brightness up to the maximum
as expected, however this is pretty ugly. Without this parameter, I can
just turn the brightness up with the fn keys and I get the nice
on-screen indicator from GNOME. However with invert_brightness I need to
turn it _up_, with the indicator showing it going up, in order to get it
down, and vice versa.
Anyway, I guess the desired result is that it should "just work" without
having to do special workarounds.


On Mon, 2012-07-16 at 06:45 -0500, Jonathan Nieder wrote:
> Those commits are both in 3.5-rc1,
> so if you get a chance to test 3.5-rc1 or newer, that would also be
> useful.
>
>


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Gedalya 10-14-2012 05:45 PM

Bug#681743: i915: display backlight brightness initially set to zero on boot
 
On 07/16/2012 07:45 AM, Jonathan Nieder wrote:

If I don't get back to you soon, feel free to ping me.

ping!


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