[gta04] Meeting minutes for GTA04 discussion 20080411

Andy Green andy at openmoko.com
Fri Apr 18 09:39:48 CEST 2008

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Somebody in the thread at some point said:
| On Fri, 18 Apr 2008 08:11:50 +0100 Andy Green <andy at openmoko.com> babbled:
|> We're talking about this MPU taking over the duty of scanning the
|> touchscreen during this time and detecting a touch and coordinating wake
|> from suspend, specifically if the MPU should start ramping up the
|> backlight during the time the CPU is resuming.
| yeah - we need both i suspect. we need the pmu to be able to handle
| and bring up bakclight OR be able to turn that behavior off (it should be

Yes this seems to be a general theme that we are OK with to allow
software decision about MPU actions or do it direct.  Then we are super

| software controlled in the kenrel). userspace needs to be able to tell the
| kenrel:
| * shut down touchscreen and generate no interupts at all
| * enable touchscreen (interrupts) (and wake up cpu when they happen)
| * disable balckight turn-on on wakeup
| * enable backlight turn-on on wakeup


| DEFAULT (imho) would be:
| * enable touchscreen interrupts
| * enable backlight on wakeup

OK, but there will be some period ~1s where the user sees white and / or
black display from LCM as backlight ramps up but X did not give video
back yet.  We can see what it looks like and decide.

| the rest then is userspace (xserver and then above that wm/desktop and
| making all the higher level decisions

Yes that is OK if it is understood that "decision" is limited to they
are "leaving a will" about what they want to happen when they are in a coma.

- -Andy
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