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Raffaele Belardi wrote: |
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> I've also found somebody reported ehci-related problem on the same SB600 |
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> chipset: |
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> http://bugzilla.kernel.org/show_bug.cgi?id=8692 |
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> |
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> The HW has problems, there are some bug fixes which should be already in |
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> the kernel I am using (2.6.25-r8, I believe, I am on another machine), |
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> but there is also a hint in comment #55 about bad interaction between |
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> ehci and CPU throttling, which I am using. I'll try disabling 'ondemand'. |
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I did some testing: |
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- powernow disabled, ehci and ohci compiled-in, USB2.0 fails |
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- powernow enabled, ehci and ohci loaded as modules, USB2.0 fails |
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=> powernow disabled, ehci and ohci loaded as modules, USB2.0 success |
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=> powernow enabled, ondemand and performance selected, default set to |
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'performance' (later changed by gnome to ondemand?), ehci and ohci |
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loaded as modules, USB2.0 success |
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The last configuration is good enough for me, I'm not losing any |
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functionality. I'll do some more testing to confirm it is working. |
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|
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Regarding powernow, the above link contains some hint to why it |
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adversely affects the USB2.0 functionality. |
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Regarding usb loaded as module, the only syslog difference I found with |
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the compiled-in version is that in the former ehci is loaded after ohci, |
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while in the latter it is loaded before ohci. |
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Is there a way to force the kernel to initialize/invoke drivers in a |
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specific order with compiled-in drivers? |
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raf |
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