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JuszR
Tux's lil' helper
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Joined: 03 Nov 2010
Posts: 134
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PostPosted: Fri May 10, 2013 1:29 am    Post subject: Black screen at boot process Reply with quote

I've recently emerged the power management modules in kernel (powersave, performance governor...) and now everytime i turn on the pc, it shows until "Waiting for udev..." then a black screen and i can see the login manager (slim).

How to fix that?
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audiodef
Watchman
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Joined: 06 Jul 2005
Posts: 5249

PostPosted: Fri May 10, 2013 2:15 pm    Post subject: Reply with quote

Can you pastebin your kernel config?
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JuszR
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PostPosted: Sat May 11, 2013 9:07 pm    Post subject: Reply with quote

http://pastebin.com/gMTDwfK0
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audiodef
Watchman
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Joined: 06 Jul 2005
Posts: 5249

PostPosted: Mon May 13, 2013 3:34 pm    Post subject: Reply with quote

What option is this?

Code:

CONFIG_X86_ACPI_CPUFREQ_CPB=y


I use CPU freq scaling and I don't see that in my .config. Everything else I have in CPU freq scaling is identical to yours, though, and my .config works.
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Hu
Watchman
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Joined: 06 Mar 2007
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PostPosted: Mon May 13, 2013 9:49 pm    Post subject: Reply with quote

drivers/cpufreq/Kconfig.x86:
config X86_ACPI_CPUFREQ_CPB
    default y
    bool "Legacy cpb sysfs knob support for AMD CPUs"
    depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD
    help
      The powernow-k8 driver used to provide a sysfs knob called "cpb"
      to disable the Core Performance Boosting feature of AMD CPUs. This
      file has now been superseeded by the more generic "boost" entry.

      By enabling this option the acpi_cpufreq driver provides the old
      entry in addition to the new boost ones, for compatibility reasons.
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chithanh
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Joined: 05 Aug 2006
Posts: 1656
Location: Berlin, Germany

PostPosted: Mon May 13, 2013 9:56 pm    Post subject: Reply with quote

If I had to guess, udev loads a KMS graphics driver module. If you have framebuffer console support built as module and not loaded, the screen will go dark, until X starts or the fbcon module is loaded.
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JuszR
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PostPosted: Fri May 17, 2013 6:32 am    Post subject: Reply with quote

I've added fbcon to the automatic loaded modues and it worked.

Thank you.
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