@foo3
Your screenshot shows the PL1 power limit is set to 19.0W and the CPU is throttling to 18.825W. That looks OK.
View attachment 239685
When you run Cinebench for a longer period of time, does the CPU Package Power drop down to 15.000W or slightly less?
The 1135G7 has a 28W power limit when in TDP-up mode but this is not the same as the long term TDP limit.
Intel® Core™ i5-1135G7 Processor (8M Cache, up to 4.20 GHz) quick reference with specifications, features, and technologies.
ark.intel.com
Intel publishes TDP-up and TDP-down information but starting with 11th Gen, Intel decided to leave out the actual TDP value that is in the middle. Similar 10th Gen G7 CPUs had a 15W TDP rating. The 11th Gen is likely exactly the same.
Here is a similar Core i5-1035G7 with the 15W TDP limit clearly stated.
quick reference guide including specifications, features, pricing, compatibility, design documentation, ordering codes, spec codes and more.
ark.intel.com
HP is known to use an embedded controller (EC) to enforce this 15W long term limit. If that is the case, you cannot use ThrottleStop or any software to get beyond this built in long term limit.
When using ThrottleStop, did you try checking the MMIO Lock box? If the MSR power limits are set appropriately and the MMIO Lock box is checked and you are still power limit throttling at 15W then you