Dear HP Support,   I would like to report a USB Power Delivery compatibility issue with my HP mobile workstation (Product Name: HP ZBU14G1a RAIM+P395 14 128GB/2T PC (BH7S2PC), Product Number: BH7S2PC#AB2) and ask whether there is a firmware solution available. For reference, my system is already running the latest BIOS version available from HP, 01.05.07 Rev.A, released in May 2026.   The system charges perfectly with the original HP 140W (28V/5A) USB-C PD charger. However, when using third-party USB PD 3.1 EPR 140W chargers, the USB-C power connection repeatedly disconnects and reconnects.   I have tested multiple chargers from different manufacturers: 1. Anker Prime 160W Charger A2687 (single-port 140W USB PD 3.1 EPR) 2. Anker 140W Charger B2697 (140W USB PD 3.1 EPR) 3. CUKTECH 15 Charger (140W USB PD 3.1 EPR)   Each charger was tested using the original USB-C cable supplied with that charger. All chargers exhibit the same behavior with the following characteristics: 1. The original HP charger works flawlessly under the same workload. 2. Before each disconnect, the PD voltage remains stable at approximately 27–28V, then suddenly drops to 0V and the PD negotiation starts again. 3. The disconnects are not caused by high power consumption. They can occur even when the actual charging power is only around 30W, and they also occur at approximately 80W. 4. If I configure the charger A2687 to advertise a maximum output of 120W instead of 140W, the disconnects become much less frequent, even though the actual charging power never reaches 120W.   Based on these observations, the issue does not appear to be related to insufficient charging power. Instead, it seems to be associated with USB PD 3.1 EPR (28V) compatibility or the system's PD controller/Embedded Controller (EC) firmware.   Could you please advise: 1. Is this a known compatibility issue with third-party USB PD 3.1 EPR chargers? 2. Is there any BIOS, Embedded Controller (EC), Thunderbolt, or USB-C PD firmware update that addresses this behavior? 3. If this is a firmware compatibility issue, could HP investigate it and provide a BIOS/EC firmware update to improve compatibility with standards-compliant USB PD 3.1 EPR chargers?   Since the original HP charger works correctly while multiple standards-compliant third-party 140W USB PD 3.1 chargers exhibit the same behavior, I suspect this may be a compatibility issue in the system firmware rather than a charger hardware problem.   I would appreciate it if this issue could be forwarded to your engineering team for further investigation. Thank you for your assistance.   Best regards, ANBENO