Thanks for reporting this. Interested to see if other 7510 owners report this. Until Dell can release a new BIOS (no ETA), your only recourse is to not use sleep. When done using the 7510, just turn it off. Then when powered on, it should act normally. I would not try to backflash to the older BIOS. It is too risky.

Thanks Dell-Chris M. However as a large Enterprise, though possible, we'd prefer Dell resolve. We have hundreds of these models and this latest rev introduced the issue. Where practical, we've had to backflash to previous rev with success. We already have a ticket open with Dell. I am just wondering if others have this issue.

We are also experiencing issues with BIOS versions 1.10.7 AND 1.12.4 on the 7510 laptop

Every single one of our 7510 laptops that gets updated to either 1.10.7 or 1.12.4 experiences a complete freeze if a power adapter is disconnected or connected. Happens if power adapter is direct to the laptop OR if the laptop is on one of our E-port Plus docks with the power adapter going into the dock. After reading a number of threads I found while searching and testing numerous scenarios, I tracked it down to having switchable graphics disabled in the BIOS. All of our 7510  laptops have the nVidia Quadro M1000M adapter. We've always set switchable graphics to be disabled in the BIOS as we've found much better performance with AutoCAD and Civil 3D this way. If switchable graphics is re-enabled in the BIOS the power freeze does not happen. Tried updating drivers for both Intel HD display adapter and nVidia adapter - using latest version from Dell and latest version from Intel and nVidia. No difference

M7510 laptops on BIOS 1.9.5 and earlier are not having this problem.

I downgraded BIOS on 2 laptops (one had 1.10.7 and one had 1.12.4) to 1.9.5 and the issue is resolved