Mm. O-kay. Well, I can describe the steps required to do this, but it won't work for you if you're not running ATI/AMD Radeon graphics. Which I am, y'see.
First step would be helpful to know what Puppy you're running; this will only work in a 64-bit Pup, like Tahr64 or Slacko64.....or Xenialpup64, etc.
Secondly, I would need to know the make & model of your graphics card. Do this for me, would you? Open a terminal (Menu->Utility->Urxvt terminal emulator), and enter the following:-
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lspci -vnn | grep VGA -A 12
You should get something similar to this:-
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# lspci -vnn | grep VGA -A 12
01:05.0 VGA compatible controller [0300]: ATI Technologies Inc RS480 [Radeon Xpress 200G Series] [1002:5954] (prog-if 00 [VGA controller])
Subsystem: Micro-Star International Co., Ltd. Device [1462:7141]
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 17
Memory at d0000000 (32-bit, prefetchable) [size=256M]
I/O ports at ef00 [size=256]
Memory at fdbf0000 (32-bit, non-prefetchable) [size=64K]
[virtual] Expansion ROM at fdb00000 [disabled] [size=128K]
Capabilities: [50] Power Management version 2
Kernel driver in use: radeon
When we've determined what your card is, we can add the appropriate 'mode-setting' entry to the kernel line.....
Mike.