Linked by Thom Holwerda on Fri 23rd Aug 2013 08:37 UTC
Linux

Pretty much for my entire career in Linux USB (eight years now?), we've been complaining about how USB device power management just sucks. We enable auto-suspend for a USB device driver, and find dozens of different USB devices that simply disconnect from the bus when auto-suspend is enabled.

For years, we've blamed those devices for being cheap, crappy, and broken. We talked about blacklists in the kernel, and ripped those out when they got too big. We've talked about whitelists in userspace, but not many distros have time to cultivate such lists.

It turns out it's not always the device's fault.

Fascinating bug.

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RE: The fix
by Fergy on Fri 23rd Aug 2013 09:08 UTC in reply to "The fix"
Fergy
Member since:
2006-04-10

Will it actually be fixed properly now that it's out, or will the devs just stick to the 20ms work-around?

From the article:
This patch is not the "real fix" for solving the issues with the USB core, and I despise fixing things by tweaking timeout values, so I'll have to work on a real fix tomorrow. But at least there's a light at the end of the tunnel for USB device power management.

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