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Mostafa Ahangarha
Asked: 2016-03-05 08:17:43 +0800 CST

Slow boot: [drm] probing gen 2 caps for device 8086:151 = 261ac83/e

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I am using Ubuntu 15.10. I checked dmesg and noticed a 30 second gap in the this part:

[ 40.947102] IPv6: ADDRCONF(NETDEV_CHANGE): wlp3s0: link becomes ready
[ 76.560493] [drm] probing gen 2 caps for device 8086:151 = 261ac83/e

I couldn't find any resources in this regard. What to do?

Update:

I disabled IPv6. still I see 13 second delay in this line:

[   36.515242 <    0.002792>] wlp3s0: associated
[   49.850234 <   13.334992>] [drm] probing gen 2 caps for device 8086:151 = 261ac83/e
[   49.850239 <    0.000005>] [drm] PCIE gen 3 link speeds already enabled
boot

2 Answers

  1. It looks like you've got a GPU driver issue. Try using the proprietary drivers (looks like you tried and it helped - sort of).

    You said you had a 54 second boot time. That is outstandingly fast. Even my best Ubuntu system with an SSD had a 45 second boot time at its best. Be happy, that's a nice time.

    Doing more research, however, this looks like it's a (at least partially) documented bug with an older version of Ubuntu. I suggest you submit a bug report.

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  2. Not a real solution - but still worth mentioning in this context: BootChart

    http://www.bootchart.org/

    Quoting the project page:

    Bootchart is a tool for performance analysis and visualization of the GNU/Linux boot process. Resource utilization and process information are collected during the boot process and are later rendered in a PNG, SVG or EPS encoded chart.

    I used it in the past for debugging boot-issues - it can be really helpful.

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