[Bug 12637] Re: LCD Brightness on Laptop Always Set Very Low at Boot

Johnny Jelinek IV JohnnyJIV at gmail.com
Wed Feb 13 14:45:13 UTC 2008


So you believe it's all kernel's fault?  Can you verify it works with Ubuntu
8.04 Alpha 64 along with Kubuntu or should I pop out some CD's?  Thanks
Richard!!

On Feb 13, 2008 1:38 AM, Richard Green <rtg at aapsc.com> wrote:

> Here's some more info.  I went to system/administration/services, and
> disabled gdm, thinking I'd reboot to a console, just to see if this was a
> kernel problem, or possibly an xorg problem, since it's happening just
> milliseconds before the screen blanks to switch to X.
>  Well, that wasn't clean at all!  it kills gdm immediately, which blew
> away my X session, as well as all the apps running, leaving me at a very
> ugly console with a huge font, reminiscent of my old commodore VIC-20.
> I managed to reboot, and it did come up without X, but with the same ugly
> huge font, so I only saw about 10 lines of text, and my prompt was somewhere
> below the bottom of the screen, so I was typing blind.
>  ...but the important part is that the screen dimmed, so this is
> definitely NOT an X issue, it's in the kernel.  I also focussed my eyes at
> the top of the screen during the boot, and I was able to see that the [PCI}
> allocation... error that was displayed there came up DIM, just before the
> screen blanks, so the actual sequence is something like this:
> 'Kernel is alive'
> 'kernel mapping tables...'
> (backlight goes to dim)
> '[PCI] allocation'...
>
> <rant>
> Once I logged in at the console, I ran startx, and was able to get my
> desktop.  I again went to system/administration/services and re-enabled gdm,
> which AGAIN took immediate action, which in this case tried to start a
> second X server, which failed once, but eventually succeeded (as :1),
> leaving me at the gdm prompt.  I have no idea which virtual console I was
> on, but ctrl-alt-f7 got me back to the X session.  I probably should file a
> bug elswhere for this usability issue...  Or just go back to school.  In
> this new age of upstart, how do I cleanly do a one-time reboot to a normal
> console?  On my old redhat or suse systems, I always had runlevel 3, but I
> discovered a while back that in ubuntu runlevel 3 is the same as runlevel 5,
> and now with upstart, I have no idea if 'runlevels' even exist anymore, and
> if they do, how to configure and specify them?
>  System/administration/services certainly has no visible 'runlevel-like'
> distinctions, /etc/inittab is gone  grrr...
>  There is no 'upstart' directory under /etc.  There is no upstart manpage.
>  Where do I look for clues?  `man init` is still there. scroll to the
> bottom, its author is Scott James Remnant.  So he calls the project upstart,
> but the binary is still init, just to confuse us, right?
>  OK, the manpage mentions /etc/event.d.  Go browse...  rc-default seems to
> fall thru to runlevel 2.  Looking at the /etc/rcn.d directories, I find that
> runlevel 1 would not start X, but all others 2 - 5 do.  So I can probably
> edit one of those other directories to create a multiuser without X
> runlevel, but I still don't know how to pass a one-time parm thru grub to
> select that level.  More studying to do, and I'm tired.  I'm going to bed
> now...
> </rant>
>
> --
> LCD Brightness on Laptop Always Set Very Low at Boot
> https://bugs.launchpad.net/bugs/12637
> You received this bug notification because you are a direct subscriber
> of a duplicate bug.
>

-- 
LCD Brightness on Laptop Always Set Very Low at Boot
https://bugs.launchpad.net/bugs/12637
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