10-23-2011 02:34 PM
Yes the Stock Windows 7 image worked perfect.
I believe it’s a driver issue but I’m not sure which one, and if one of the driver's has a dodgy xp driver made. I have contacted Lenovo and logged a call but they so far have no luck and have received other calls to regrading this issue.
10-23-2011 10:16 PM
I believe this is much more than an Audio problem. I think it is easiest to see in the audio but the system itself is extremly slow. If you look at the boot times (from power on to login screen) for the Windows 7 Lenovo image Vs. Windows XP Lenovo image, the XP takes over twice as long (Win7 takes about 35 seconds, WinXP takes about 1:25 sec). The slowness is also apparent when installing programs, using the internet. If you have task manager open while doing these operations you can see the resource usages max out.
Does anyone elses L420 have these issues. It seems like a bad driver or some incompatibility. I have tried speaking to Lenovo, their only options are send it back and get a new one (already done) or just use Win7.
10-24-2011 02:02 PM
03-23-2012 08:30 AM
I have the same sound problem with a L420 and XP and I found a solution. It seems that my SATA CONTROLLER MODE OPTION set to Compatibility instead of AHCI (default option) in the BIOS. I think that you need to have the right driver installed in XP before changing this setting. If not you'll have a blue screen at startup.
07-20-2012 01:13 PM
I found the answer.
If you have installed Windows XP on a Lenovo L420, without utilizing the AHCI driver during install, you can install the driver after. Below is how. I think many of the steps can be skipped. I have bolded what I think is the most important.
The following was found here: http://www.blah-blah.ch/it/how-to-s/enable-ahci/
When I tried this I learned a very important lesson: YOU MUST USE THE DRIVER THAT IS FROM THE LENOVO WEBSITE not the Generic Intel Driver package you downloaded from Intel or from some 3rd party source.
The driver that you use for the Lenovo L420 is:
Intel(R) Mobile Express Chipset SATA AHCI Controller
Before applying this fix, the L420 would take 1:35 to simply boot. Now it boots in 10 seconds. LOL
Oh, and the startup sound plays normally.