I have an Aspire V3-572 (1920x1080) laptop with a HD5500 that I have recently decided to perform the necessary operations to make into a Hackintosh running El Capitan current release. I have been running a home brew tower as a hack since somewhere around Snow Leopard with no real problems (except the issue with iMessage everyone had a while back when Apple was playing with security) and currently run the Sierra 10.12 dev beta 2 on it.
I managed to get the laptop to boot from a USB stick with just a few few problems after a day or so, once I discovered the secret password in the config.plist file (ig-platform-id). That led me to ReHabMan's config files and other cool stuff like an updated FakeSMC, etc from his site (Thanks ReHabMan - you are THE MAN).
All that was great but didn't work either until it all led me to another thread with indicated that most of us were setting ig-platform-id wrong to get it to boot, since setting it to the "correct" value resulted in a kernel panic on boot. This led to ReHabMan's excellent explanation that with the wrong settings the graphics driver doesn't load and you boot in VESA mode which works sort of, but without the Intel graphics driver - which results in lag and only 7MB of video ram. AH HA!.
That eventually led to yet another thread where someone with a HD5500 also found all this and added a DSDT and a few other minor settings. That got my laptop to boot and say it has 1536MB of vRam! YEAH. Well except the display collapses and scrambles shortly into the boot process. By waiting until it finishes booting and then closing the laptop and letting it sleep, then opening it back up to wake it up would result in the display correcting itself. So, I lived work around for a few days, and then stumbled onto another thread (I think on ******) where someone mentioned that they solved the scrambled screen and their explanation made so much sense I tried it and it works - for me. The explanation was the reason the screen scrambles is the (some) Bios can not handle 1920x1080 resolution - so...
If you have it all working on a laptop with the HD5500 and you have the scrambled display during boot, and the normal "phase two boot glitch fix" doesn't help (I tried that, no joy) - give this a try. Change the GUI ScreenResolution in the config.plist to something smaller - I use 1024x768. I expect many like me are setting ScreenResolution to 1920x1080 thinking that was the final desired resolution, and it is the starting/boot resolution. Changing that and all my display problems instantly were fixed. The laptop boots and displays properly at the lower resolution and the someplace into the boot process corrects itself and switches to the final resolution of 1920x1080 by itself - I expect when the Intel driver loads.
(If you want/need to see my config.plist or the DSDT etc, I will be glad to upload those later today when I get home - just leave me a note here. Sorry, I can't provide links to the other threads and ****** conversations I referenced, I have forgotten them, since I went through SO MANY of them while searching for the final tweak to get this stable and working.)
