[Bug 272247] Re: System freezes during boot, unless I hold a key down

[Stefan Bader]

** Description changed:

  Once the Ubuntu splash screen loads with the progress bar that moves back and forth, it freezes. Holding down any key unfreezes the system, and it continues 
  loading normally, until I release the key, at which point it freezes again. Holding a key down again unfreezes the system again.
  
  Pressing Alt+F1 to show the output also freezes, so I know it isn't just
  the splash screen freezing, but the entire system.
  
  Once X loads, it works perfectly fine though, and I don't have to keep
  holding a key down.
+ 
+ Update 2009/08/31:
+ 
+ The problem behind this seems not limited to a certain controller chip,
+ but related to ACPI BIOS definitions. The IRQ0 override defines to which
+ interrupt number the timer interrupt is supposed to be routed. Most BIOS
+ define a route to IRQ2, so the timer source (hpet in most cases) has to
+ deliver an IRQ2 whenever a timer expires. The problem is, that this is
+ not always correct (either hpet does not use IRQ2 or IRQ2 is not enabled
+ on the chipset). So as soon as all CPUs go into sleep there is no timer
+ irq to wake them up. To solve this automatically one would need
+ documentation about the chipsets pci config space which is often secret.
+ 
+ Workaround for affected systems: Use of "acpi_skip_timer_override" as
+ kernel command line option. Sometimes "nohpet" or "acpi=noirq" have been
+ reported to work, too.
+ 
+ ---
  
  Update : This bug happens with 2.6.26 and 2.6.27 kernels with a computer
  that has Nvidia MCP67 motherboard. A known workaround that sometimes
  works is to add nolapic to GRUB boot kernel options. acpi=noirq is also
  known to work.
  
  ProblemType: Bug
  Architecture: amd64
  DistroRelease: Ubuntu 8.10
  NonfreeKernelModules: wl nvidia
  Package: usplash 0.5.23
  ProcEnviron:
   PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: usplash
  Uname: Linux 2.6.27-3-generic x86_64
  
  ----------
  Possible systems affected include:
  Nvidia MCP67 Chipset
  Compaq Presario F700
  Compaq Presario F763NR
  Sony Vaio PCG-GRT-815E - from the Mandriva errata
  HP Pavilion DV6545eg Notebook - from duplicate
  HP Pavilion DV6736nr
  HP Pavilion DV6745us - from a duplicate
  HP Pavilion DV6620es
  HP Pavilion DV9610us
  HP Pavilion DV9700z
  HP Pavilion DV6915nr
  HP Pavilion DV9645ed
  HP G6062ea

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System freezes during boot, unless I hold a key down
https://bugs.launchpad.net/bugs/272247
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