Comment 7 for bug 1308264

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Sebastián (seebaastian) wrote : Re: Ubuntu 14.04 Beta 2 stuck at "Switched to clocksource tsc" when booting up, then resumes booting to the login screen, after 1 minute

Hello all,

I've tried zipjebt workaround in my chromebook and it doesn't work. Sadly it also disables the trackpad so I need an external mouse. I've also tried to have a more verbose log adding the flag verbose to the init line in grub but I had no luck. does some body know how to record what the kernel is doing at boot to pick a few samples that may could help in debugging?

This is my boot command

[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=5a6bd70a-bb11-49ee-b159-0046c358057c ro nolapic verbose splash vt.handoff=7

and the problem still there...

[ 1.856888] usb 2-4: string descriptor 0 malformed (err = -61), defaulting to 0x0409
[ 1.860520] usb 2-4: New USB device found, idVendor=0489, idProduct=e056
[ 1.861878] usb 2-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 2.546997] Switched to clocksource tsc
[ 53.782702] regulator-dummy: disabling
[ 53.784104] Magic number: 10:527:686

I've also seen in the youtube link that downgrading the kernel fixes de issue. Nevertheless downgrading the kernel will also disble the trackpad support making it a partial solution. To be honest I don't know if the kernel used by L Zhi could be a solution... I've wrote to the user to know if the trackpad issue still present with downgrade. I'm waiting for the answer.

Youtube User L Zhi wrote:
"ok, in case you do not know yet.. I managed to get around by downgrading the kernel.. using 3.12.17 and it boots in a blink. http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12.17-trusty/ "

I wish I could do something else to help in this issue but my knowledge is far away from this. I'm a newbee.

Sebastian