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Acpi Tos1901 Driver4/17/2021
Like you I discovered Supervisor Password Utility was the key and like you, discovered it refused to install on Windows x64 (Windows Vista x86 or Windows 7 x86 isnt a problem).The dreaded TOS1901 missing device on Toshiba Laptops (Fixed).While this device does not appear to affect system performance; it is annoying to have one Unknown Device in your Control Panel.
The Firmware Linkage Driver has the Hardware IDs of TOS1901, TOS1901 and ACPITOS1901. Eventually, it was discovered that this particular device was installed as a part of the Toshiba Supervisor Password Utility. This SHOULD have resulted in a simple fix but Toshiba made this utility locked to a specific set of Serial Numbers. This meant that if your laptop had a serial number that wasnt in this set, you were out of luck. The program would refuse to install and the driver would not load. I tried to get an image of this, but not that I have the Firmware Linkage Driver installed, I cant seem to get it to bring up an error. For several years now, I would randomly try and find that driver. The installer is browseable, if you use the right programs. So long story short, I was able to extract the Firmware Linkage Driver from the install file. See the image below, showing the driver installed on my Toshiba M115 running Windows 7 64-bit Professional. Now here are the drivers for you: Download Driver - XP (unknown if only 32 bit or if XP64 works as well), Vista (32 and 64 bit), Server 2003 (unknown if only 32 bit or if 64bit works as well), Win7 (32 and 64 bit). Also, please report other operating systems that these drivers DO install on (ie Server 2008, Server 2008 R2, XP64, Server 2003 64 bit, etc.). Reply Delete Replies Reply PedroDaGr8 Sunday, October 25, 2009 at 3:22:00 PM EDT Haha, thanks. Reply Delete Replies Reply Unknown Tuesday, December 1, 2009 at 11:16:00 AM EST Wow, I was tearing my hair out trying to find this last unknown device (new Win7 Pro installation on old Toshiba laptop). Acpi Tos1901 Update Site ItThanks Reply Delete Replies Reply Daniel Garca Len Monday, January 4, 2010 at 8:27:00 AM EST Thanks for the driver man, youre God in person ) Reply Delete Replies Reply dheadz Tuesday, May 18, 2010 at 7:28:00 AM EDT Ive installed the Value added package from Toshiba driver update site it has solved the problem. Reply Delete Replies Reply motorhead Sunday, June 6, 2010 at 4:30:00 PM EDT thaks a lot. I installed Windows 7 x64 late last year and like many had the same annoying Unknown Device. After spending ages doing various Google searches and contacting Toshiba I was resolved to disabling it (like you say, it doesnt seem to do any harm). My Toshiba laptop came with 2GB RAM (upgradable to 4GB) and Vista x86. I went for this model as it supports 4GB but what Toshiba didnt say, was they dont provide drivers for this model for Windows x64. After sending several e-mails asking how I was supposed to get 4GB RAM with Windows x86 and getting nowhere (Toshiba didnt want to know), I gave up. Their response was that you can install 4GB RAM with Vista x86 and whats the problem only being able to use 3.2GB of it. Obviously not answer I was happy with.
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