[support-gang] using usb2vga with 11.2.0 and 10.1.3

[Kevin Gordon]

Roger that.  I will try.

I do have a serial adapter cable semi-permanently attached to one of the
XO's - i use it to debrick any RTC machines I get off ebay., so with
training, I might be able to perform those steps too later, once I get to
you on the first steps.

KG


On Sun, Jun 19, 2011 at 8:48 AM, Daniel Drake <dsd at laptop.org> wrote:

> On 19 June 2011 13:14, Kevin Gordon <kgordon420 at gmail.com> wrote:
> > Since it seems to never work on any build, if you like, I can concentrate
> on
> > just os23 on multiple XO 1.0 machines on multiple USB ports and see if
> there
> > are any differences in where it halts, even if I've previously plugged it
> in
> > after boot or not.  I've had it get to the 3rd dot before hanging on a
> > couple of occasions, and I think that's the time I see the 'Starting
> Cronds'
> > on the console .  So, if I have a more directed rather than shotgun plan,
> > perhaps I can be more helpful.
>
> That's interesting, thanks for the extensive testing.
> On the ticket I suggested some next steps for debugging.
> http://dev.laptop.org/ticket/10568
>
> The 3rd one you can do without a serial console. "See if you can
> reproduce it as follows: move the sisusbvga.ko file to somewhere where
> modprobe can't find it, boot the system and stop X. Then run a loop at
> the shell of insmod;rmmod, see if that makes it possible to reproduce
> the hang quickly"
>
> More specific instructions for this:
>
> Boot without USBVGA connector attached. Go to a root terminal and move
> sisusbvga.ko to /root:
> # mv /lib/modules/*/kernel/drivers/usb/misc/sisusbvga/sisusbvga.ko /root
>
> Power off the system, connect USBVGA, boot. It should boot
> successfully, but without any VGA output. Press ctrl+alt+f2 to get to
> a root terminal, and stop X/sugar with:
> # stop prefdm
>
> Now load the sisusbvga driver manually and see if it hangs:
> # insmod /root/sisusbvga.ko
>
> Wait a few seconds, see if the system is hung or if you can still type
> on the console.
>
> If you can still type, unload the module:
> # rmmod sisusbvga
>
> and now try loading/unloading a few more times with a few seconds
> pause between each step.
> # insmod /root/sisusbvga.ko
> ...
> # rmmod sisusbvga
> ...
> # insmod /root/sisusbvga.ko
> ...
> # rmmod sisusbvga
> ...
> etc
>
> The idea is to find out whether the system hang is caused by the
> loading of sisusbvga. It might not hang first time, may require a few
> attempts, hence the repeated loading.
>
> Thanks,
> Daniel
>
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