I have two, no longer "current", but not "old" laptops.
One is a Lenovo ThinkPad T510, with 4 GB memory and 500 GB disk. It works pretty well with eC 2.0 and up (eCS 2.2 b2 is easier to install). Sound works (as well as sound ever works in a laptop). the wired NIC (Intel) works (I am now using the Arca Noae E1000b driver, but the older E1000e driver also works). USB (2.0) works. Panorama works well (I chose the 1600x900 screen, which looks great. 1366x768 is way to small). WiFi (a Realtek chip) doesn't work (I am now using a D-Link DIR-506L for WiFi). AMouse works, and the Trackpoint, the Touchpad, and an external mouse all work. I do turn off the Touchpad in the BIOS.
The second is a Lenovo ThinkPad L530 with 4 GB memory and 500 GB disk. This one is an UEFI BIOS, and it works okay, for what I use it for. I needed eCS 2.2 b2, and DFSEE, to get it to install. I also require the QSINIT loader to get more than 512 meg usable. Sound sort of works, with UniaudUpdate1.09.06-2.02.01.zip, and some messing with UMIX. UniaudUpdate-1.09.06-1.09.26.zip won't even load. The "problem" is that it sounds like there is maximum reverb applied, so it echos on, and on. I haven't spent a lot of time with this, because I don't really care if sound works, or not. There is a USB 3.0 adapter, which doesn't work, of course, but the 2 USB 2.0 adapters work well. The wired NIC (Realtek) works with the Arca Noae MMRE driver, as well as with the older R8169 driver. Panorama works well (again, I chose the 1600x900 screen). WiFi (an Intel chip) works to the point that I can use GENMAC to load a driver, but I can find no way to turn on the radio. It does exactly what a wired NIC will do, when there is no cable attached. Again, I use the D-Link DIR-506L for WiFi access. This one also has a built in camera, which works with WebSee. AMouse works, and the Trackpoint, the Touchpad, and an external mouse all work. I would love to turn off the Touchpad in the BIOS, but there is no setting, so I have had to tape a piece of cardboard over the pad, to keep my hands off of it.
Of course, both machines have features that don't work with eCS, but they are not all that useful with windows either.
The bottom line is that you won't know if a system will work, or not, until you try to make it work. It took me about 6 months to get the T510 to go properly, and it took about the same time to get the L530 to go. Of course, it would be a LOT easier if I just wiped windows, but I didn't want to do that. One of the FIRST things to do, is create the recovery DVDs, so you can get back to the way it was when you started. Don't count on a recovery partition, because that may not work after you start messing around with things. FWIW, the eCS demo CD did work with the T510 (with expected omissions), and it did not work with the L530, at all, so you cannot depend on that as a test.
My first choice, between the two, is the T510, mostly because I can turn off the TouchPad.
ACPI(driver from distributive): All 4 core (2 hardware and 2 hyperthreading) works fine also work speedstep technology
Actually, I would recommend turning hyperthreading off (you are told to do that in the ACPI docs). I used it for a while, and it seemed to work okay, but I did have a few very strange problems that didn't go away until I turned off hyperthreading. It doesn't really do much for OS/2 anyway, and may actually slow the system.