Unsigned drivers in DisplayLink 7.9 M4

JamesH · 01-15-2016, 01:07 PM

Hi,

Can you try installing the latest Windows Updates for Windows 7?

If you're still having issues after that please attach the output of this tool

Thanks,
James

joelinho · 01-15-2016, 01:49 PM

Hi,

No I cannot install the latest updates for Windows since I am using a corporate computer, and access to windows update is restricted by a group policy.

Besides I am not sure I understand how updating windows will solve the problem that DisplayLink are shipping unsigned drivers? Just sign the drivers and release an updated version of the M4 installer.

BR,
Joel

gevans · 01-18-2016, 02:49 AM

Seeing the exact same issue but not on every install. No issue with 7.9M3.

AlbanRampon · 01-19-2016, 04:44 PM

Joel,
DisplayLink drivers are signed. We don't/cannot put unsigned drivers on Windows Update and 7.9 M4 is the same package as used in Windows Update for Windows 10.
Our drivers used to be signed TWICE. By us, then by Microsoft.
Microsoft advised us to stop signing because their signature was enough. So we did.

By updating, you will get Microsoft way of checking digital signatures (certificates most likely) which they probably changed since you last got a cumulative security patch.

If we sign, then we hit another Microsoft bug on Windows 10 which forces computers which don't have the zero day package (or later security patch) into recovery mode because the way of checking the signatures has an issue with dates.

Error message: Windows requires a digitally signed driver

joelinho · 01-20-2016, 07:55 AM

OK. that explains it. Too bad you cannot give me a KB number to look for as I am unable to update this system by myself and updates are only pushed out by the system administrator.

AlbanRampon · 01-29-2016, 03:29 PM

Hello, update for Windows 7 users. I've asked we re-sign the 7.9 M5 like we did until 7.9 M3.
This means it should work again on outdated Windows 7 installations, provided you could validate DisplayLink certificate before!

This means that if you update to Windows 10, you MUST make sure your Windows 10 install is fully up-to-date (TH2 / Build 1511 or later) before you install DisplayLink drivers.

Otherwise you'll get to the Windows recovery console because the Windows 10 RTM (TH1) has a bug which cannot validate signature date. You generally don't see that with other drivers because, unlike DisplayLink, they are not loaded during boot.

But let me stress it again, DisplayLink drivers have always been signed properly as they wouldn't have been accepted by Microsoft otherwise.

joelinho · 02-01-2016, 06:33 AM

This is good news for us still stuck on Win7. I have actually managed to install M4 now so I guess the latest batch of updates that was pushed to my computer contained that which was missing before.

Now I just hope that all those BSODs will be fixed as well. Perhaps in M5... :-)

01-18-2016, 02:49 AM	#3
gevans Junior Member Join Date: Dec 2012 Posts: 6	Error Seeing the exact same issue but not on every install. No issue with 7.9M3.

01-19-2016, 04:44 PM	#4
AlbanRampon Senior Member Join Date: Sep 2015 Posts: 1,685	Joel, DisplayLink drivers are signed. We don't/cannot put unsigned drivers on Windows Update and 7.9 M4 is the same package as used in Windows Update for Windows 10. Our drivers used to be signed TWICE. By us, then by Microsoft. Microsoft advised us to stop signing because their signature was enough. So we did. By updating, you will get Microsoft way of checking digital signatures (certificates most likely) which they probably changed since you last got a cumulative security patch. If we sign, then we hit another Microsoft bug on Windows 10 which forces computers which don't have the zero day package (or later security patch) into recovery mode because the way of checking the signatures has an issue with dates. Error message: Windows requires a digitally signed driver __________________ Alban Rampon Senior product manager, universal docking stations and accessories Where to download the latest DisplayLink drivers How to clean up a corrupted installation How to report issues to DisplayLink for a speedy resolution

01-29-2016, 03:29 PM	#6
AlbanRampon Senior Member Join Date: Sep 2015 Posts: 1,685	Hello, update for Windows 7 users. I've asked we re-sign the 7.9 M5 like we did until 7.9 M3. This means it should work again on outdated Windows 7 installations, provided you could validate DisplayLink certificate before! This means that if you update to Windows 10, you MUST make sure your Windows 10 install is fully up-to-date (TH2 / Build 1511 or later) before you install DisplayLink drivers. Otherwise you'll get to the Windows recovery console because the Windows 10 RTM (TH1) has a bug which cannot validate signature date. You generally don't see that with other drivers because, unlike DisplayLink, they are not loaded during boot. But let me stress it again, DisplayLink drivers have always been signed properly as they wouldn't have been accepted by Microsoft otherwise. __________________ Alban Rampon Senior product manager, universal docking stations and accessories Where to download the latest DisplayLink drivers How to clean up a corrupted installation How to report issues to DisplayLink for a speedy resolution

01-15-2016, 01:07 PM	#1
JamesH Senior Member Join Date: Jan 2012 Posts: 1,523	Hi, Can you try installing the latest Windows Updates for Windows 7? If you're still having issues after that please attach the output of this tool Thanks, James

01-15-2016, 01:49 PM	#2
joelinho Junior Member Join Date: Jan 2016 Posts: 6	Hi, No I cannot install the latest updates for Windows since I am using a corporate computer, and access to windows update is restricted by a group policy. Besides I am not sure I understand how updating windows will solve the problem that DisplayLink are shipping unsigned drivers? Just sign the drivers and release an updated version of the M4 installer. BR, Joel

01-20-2016, 07:55 AM	#5
joelinho Junior Member Join Date: Jan 2016 Posts: 6	OK. that explains it. Too bad you cannot give me a KB number to look for as I am unable to update this system by myself and updates are only pushed out by the system administrator.

02-01-2016, 06:33 AM	#7
joelinho Junior Member Join Date: Jan 2016 Posts: 6	This is good news for us still stuck on Win7. I have actually managed to install M4 now so I guess the latest batch of updates that was pushed to my computer contained that which was missing before. Now I just hope that all those BSODs will be fixed as well. Perhaps in M5... :-)