** 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
-- System freezes during boot, unless I hold a key down https://bugs.launchpad.net/bugs/272247 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
