I would need more information in regards to your system configuration:
Which version of Windows do you have?
Additionally, please provide the processor model of your computer.
On Windows 10
Click on the Windows icon, and search for "System"
Look for System Control Panel then note the processor model.
I understand Intel engineering team is currently working on new graphics drivers for Windows 10. I still do not have an estimate but they will be posted at Intel® Download Center
Please review information on post #93: Re: -NEW- Intel® Iris™, Iris™ Pro, and HD Graphics Production Driver for Windows* 10 64-bit 220.127.116.11.4256
I just tested driver version 4279 but I do not see any issues on the start menu. See picture below:
Please follow the guidance/process in this sticky Default level information for reporting Graphics issues
Answers (N/A if not applicable)
Provide a detailed description of the issue AND 'does it fail every single time, or only sometimes?' If you can offer a % rate please do.
just enabling CMAA is not a sufficient test to prove that it does not affect text rendering
Brand and Model of the system.
HP Pavilion 15 Notebook PC
Hybrid or switchable graphics system? ie Does it have AMD or NV graphics too?
Make and model of any Displays that are used to see the issue (see note2 below).
LFP = Local Flat Panel (Laptop panel)
EFP = External Flat Panel (Monitor you plug in)
LFP 1366 x 768 (32 bit) (60Hz) SDC4951
How much memory [RAM] in the system (see note2 below).
Provide any other hardware needed to replicate the issue.
ie: Cables&brand, cable type [vga, hdmi, DP, etc], dock, dongles/adapters, etc
Hardware Stepping (see note1 below).
Operating System version (see note2 below).
Windows 10 Education 64-bit (10.0, Build 10240) (10240.th1.150729-1800)
VBIOS (video BIOS) version. This can be found in “information page” of CUI (right click on Desktop and select “Graphics Properties”.
Graphics Driver version; for both integrated Intel and 3rd party vendors (see note2 below).
SW/Apps version used to replicate the issue.
Single display, clone, or extended (see note2 below).
Display resolution & refresh rate setting of each display (see note2 below).
1366 x 768 (32 bit) (60Hz)
AC or DC mode, i.e. is power cable plugged in or not?
How to repro
Please provide steps to replicate the issue. These steps are very crucial to finding the root cause and fix.
A screenshot to illustrate the issue is a huge plus. A video of the failure is even better! Attach to the post or provide the YouTube link.
1. enable CMAA
2. the effect of enabling CMAA is not instantly visible running any application that flushes the l3 cache lines will cause the objects in the start menu to be drawn again
3. open the start menu and use to scroll bar to see the effect of enabling CMAA
the problem is still there however this also now causes the icon of application to become distorted e.g the Dropbox icon is the worst affected
can more information about how Intel has implemented CMAA this is causing this problem Conservative Morphological Anti-Aliasing (CMAA) - March 2014 Update | Intel® Developer Zone
for the effects of CMAA to be seen i had to restart my computer not all options in the Intel control panel are applied instantly
have you being able to replicate this problem