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wilsonsamm
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Joined: 12 Jul 2008
Posts: 196
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 Posted: Wed Nov 25, 2009 7:07 pm Post subject: Suspend/resume idea |
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My understanding of the matter surrounding dodgy suspend/resume and some hardware, is that the driver initialises some hardware before it can be used. If the power is cycled, then the hardware is in the uninitialised state, which the driver isn't aware of.
For example, my laptop sometimes mutes all sound after suspend/resume. It may be fixed by unloading and loading the driver module, because as a module is loaded, the kernel calls the [initialise] function of that driver, the responsibility of which being, that the hardware is in a known state and ready to accept software control.
Why not simply have the kernel call this function on wakeup for known problematic hardware? Or alternatively, have it launch an executable, or a script, where the user may program his/her own procedure of unloading and loading modules and re-initialising hardware &c? |
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BonesToo
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Joined: 19 Aug 2003
Posts: 153
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| Posted: Wed Nov 25, 2009 8:03 pm Post subject: Re: Suspend/resume idea |
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| wilsonsamm wrote: | | Or alternatively, have it launch an executable, or a script, where the user may program his/her own procedure of unloading and loading modules and re-initialising hardware &c? |
This exists in hibernate-script.
You can set it to unload and reload a module on suspend/resume. And you can have it run a script before suspend or after resume. |
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wilsonsamm
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Joined: 12 Jul 2008
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| Posted: Thu Nov 26, 2009 3:13 pm Post subject: |
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I did NOT know that. Well, I used to use just echo "disk" > /sys/power/state, and have the kernel do it all (hance my suggestion the solution should be in kernelspace).
This was on a laptop from 1998, though. Do we prefer userspace solutions these days or something? |
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Kernel & Hardware
