On Thu, 27 May 2010 18:25:10 +0100 Matthew Garrett <mjg59@xxxxxxxxxxxxx> wrote: > On Thu, May 27, 2010 at 07:20:56PM +0200, Peter Zijlstra wrote: > > > Suppose X (or whatever windowing system) will block all clients that try > > to draw when you switch off your screen. > > > > How would we not wake them when we do turn the screen back on and start > > servicing the pending requests again? > > How (and why) does the WoL (which may be *any* packet, not just a magic > one) turn the screen back on? Well on my laptop today it works like this A WoL packet arrives The CPU resumes Depp process, chipset and laptop BIOS magic happens The kernel gets called The kernel lets interested people know a resume occurred The X server sees this X reconfigures the display X redraws the display (either by sending everyone expose events or by keeping the bits, not sure how it works this week as it has changed over time) My desktop re-appears Alan -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
