Most energy efficient resolution, 1440x900 or just scaling on 2880x1800 OLED ?

[Gaston]

Hi,
I'm new here and want some opinions and possibly advice on how to proceed.
I'm curious if I should make a new stretched custom resolution or just use scaling?
Does one scaling look better than the other?
Which method gives the best battery life?

Sorry about the long text, tried condesing with spoiler tags but must have forgotten how they work

Lenovo laptop with the following specs:
Computer: LENOVO 83JR
CPU: AMD Ryzen AI 7 350 (Krackan1, KRK1-A0)
AMD AGESA Version: StrixKrackanPI-FP8 1.1.0.0d
Chipset: AMD Promontory/Bixby FCH
Memory: 32768 MBytes LPDDR5 SDRAM 7500MT/s
4x MT62F2G32D4DS-023 WT
Graphics: AMD Krackan - Internal GPU [Lenovo]
AMD Radeon 860M, 512 MB LPDDR5 SDRAM
Internal DAC(400MHz)
Video BIOS Version: 023.010.001.022

Display connections: HDMI2.1 CONN, eDP CONN, DP1 CONN
Display: OLED 2880x1800 LEN140WQ+ / LEN8AC3
Drive: SKHynix_HFS001TEM4X182N, 1000.2 GB, NVMe

Code:

Driver Manufacturer:                    Advanced Micro Devices, Inc.
  Driver Description:                     AMD Radeon(TM) 860M Graphics
  Driver Provider:                        Advanced Micro Devices, Inc.
  Driver Version:                         32.0.22029.9039 (Radeon Software Adrenalin 25.12.1)
  AMD Driver Package Version:             25.20.29.09-251203a-196284C-AMD-Software-Adrenalin-Edition
  AMD Catalyst Driver Version:            15.8
  AMD Software Driver Version:            25.12.1

Code:

Lenovo [Unknown Model: LEN8AC3] -------------------------------------------

[General Information]
  Monitor Name:                           Lenovo [Unknown Model: LEN8AC3]
  Monitor Name (Manuf):                   LEN140WQ+    
  Serial Number:                          Unknown
  Date Of Manufacture:                    Week: 0, Year: 2024
  Monitor Hardware ID:                    Monitor\LEN8AC3
  Max. Vertical Size:                     19 cm
  Max. Horizontal Size:                   30 cm
  Horizontal Frequency:                   230 - 230 kHz
  Vertical Frequency:                     30 - 120 Hz
  Maximum Pixel Clock:                    710 MHz
[Advanced parameters]
  Input Signal:                           Digital
  Color Bit Depth:                        10 Bits per Primary Color
  Digital Video Interface Standard Supported: DisplayPort
  Gamma Factor:                           2.20
[DPMS Modes]
  Standby:                                Not Supported
  Suspend:                                Not Supported
  Active Off:                             Not Supported
  Standard Colour Space (sRGB) Default:   Not Supported
  Preferred Timing Mode:                  Supported
  Default GTF (Continuous Frequency):     Supported
  DFP 1.x Compatible:                     Yes
[Supported Video Modes]
[Chromaticity Coordinates]
  Red [x,y]:                               0.6807, 0.3184
  Green [x,y]:                             0.2197, 0.7246
  Blue [x,y]:                              0.1426, 0.0391
  White [x,y]:                             0.3135, 0.3291
[Color Gamut]
  sRGB Coverage:                          154.991 %
  AdobeRGB Coverage:                      114.898 %
  DCI-P3 Coverage:                        114.255 %
  NTSC Coverage:                          109.777 %
  BT.2020 Coverage:                       81.970 %
  HDR Support:                            Supported
  HDR10+ Support:                         Not Supported
[AMD FreeSync]
  AMD FreeSync Support:                   Supported
  Native Color Space Set:                 Supported
  Local Dimming:                          Supported
  Gamma 2.2 EOTF:                         Not Supported
  Replay Mode:                            Not Supported
  Fast Transport:                         Not Supported
  PQ EOTF:                                Supported
  Panel Type:                             OLED
  Refresh rate:                           30 - 120 Hz
  NVIDIA G-Sync Support:                  Not Supported
  HDMI AdaptiveSync Support:              Not Supported
[DisplayPort]
  VESA AdaptiveSync Support:              Supported
  Refresh rate:                           30 - 120 Hz
[Driver Information]
  Driver Manufacturer:                    Lenovo
  Driver Description:                     Lenovo HDR Monitor
  Driver Provider:                        Lenovo
  Driver Version:                         5.0.0.10
  Driver Date:                            29-May-2025

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[Gaston]

Was an interesting idea but doesnt seems to work without GPU-scaling on laptops.

ToastyX Wrote:Laptop displays usually don't have scalers and can't display non-native resolutions without GPU scaling. To add other refresh rates, add the refresh rate at the native resolution. The graphics driver will automatically add the refresh rate to lower scaled resolutions.

[ToastyX]

I don't know what you're asking. With a laptop, you only have one option and that's GPU scaling. Since the laptop has an AMD GPU, you can use this: https://www.monitortests.com/forum/Threa...Editor-SRE

[Gaston]

Thanks for at least trying to answer.
In theory maybe using the GPU for scaling would look slightly better but be a bit more battery consuming compared to have the display/panel scale the display.
But as you had already explained most laptop displays don't even have scaling so then it's a non question.

I did use your excellent SRE-tool to create the 1440x900 which worked perfectly, thanks again!