2481 - 3SG L530 - first 1.4 GB of RAM of 4 GB 'reserved by material' and now 2.2 GB? Problem BIOS/UEFI?
Hello
Using a Thinkpad L530, which becomes a few weeks over a year (-> warranty expired). Running Windows 7 64-bit on it (in BIOS compatibility mode).
There is, at the same time (cannot say for sure) four months when I installed an update of the BIOS (which jumped several versions), then all of a sudden my resource monitor showed 1.4 GB of memory reserved by the hardware.
I did some looking and also called the hotline of Lenovo Germany support (because they don't send support) because my unit was still in warranty, at this time, but useful guys might not help me get back memory - the conclusion was that for some reason, that the update of the BIOS must have changed how the integrated graphics card memory is managed intel (size is dynamic). Due to the fact that a downgrade to BIOS was impossible (due to some changes), they also offered to replace the motherboard with an older BIOS revision, but I refused (I have that it will not much help because I need to upgrade the BIOS later anyway, and really, I didn't miss my primary work machine).
However, yesterday, after having done nothing more to try the different operating system a few live CD and certainly not after installing a new BIOS update or similar, sudden reserved hardware memory was 2.2 GB (I can say 100% certainty that Monday, it was not, since I was unable to resume a VirtualBox VM suspended Monday due to the change of configuration of memory - and to make sure I also was installing drivers) (or updates to the BIOS since Monday).
So I'm now sure that this problem (and probably also the other I had before) was not caused by an upgrade of the BIOS or changes how Intel's integrated graphics is managed, but more likely a BIOS/Firmware bug.
Also, the missing memory shows not only in Windows 7, but when I start a live Linux CD or at memtest86 boot.
So I studied a bit and found out, that if I boot a Linux live CD (which support it) in UEFI mode (with CSM disabled legacy support), suddenly I can reuse many of my 4 GB of RAM. But only here, and I would use it on Windows and not by the re-installation of a license of Windows 8 in UEFI mode...
Some information that I have collected (such as memory card EFI and card memory at the start of Windows and Linux, and Linux UEFI, screenshots of Windows) is available in this post in another forum: http://superuser.com/questions/746497/what-hardware-device-used-to-eat-up-1-4gb-of-my-4gb-ram-and-no...
Does anyone have any suggestions
-How do I know where this memory is gone?
-Why memory cards so different between boot UEFI and BIOS/CSM
-How to get the memory (without replacement)
I heard of many problems UEFI (not only for Lenovo but also other suppliers) is caused by certain invalid EFI variables, is there a way to reset all variables of the EFI on my laptop (I am aware that I may have to reconfigure the boot settings later)? I tried flashing the BIOS (a version at the bottom and back again) and installation by default, or reset settings Secure Boot loading, but that did not help for my problem.
Tags: ThinkPad Notebooks
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