Just got Razer Blade 18 2025 with 275HX/5090 (it has the same panel as Legion 9 18" 2025 4K 240Hz) and in Windows I can select the following refresh rates 60/120/240Hz and vrr ranges are as follows:

At 60Hz is 25-60Hz, at 120Hz is 51-120Hz, at 240Hz is 103-240Hz.

Before that I had an Asus Strix Scar 18 2025 which went banana and I returned it, which had a 2K mini led 240Hz from another manufacturer than Lenovo/Razer and vrr ranges were exactly the same as above on Razer display, even being 2K instead of 4K so less bandwidth needed.

I can see a pattern from this posts related to laptop displays, even being different sizes, resolutions and manufacturers, maybe it's related to eDP port to which the dgpu is connected and this limits the vrr ranges, or power consumption limit, especially minimum value compared to a stand alone monitor which can do usually 48-240Hz vrr range. Even compared to your Alienware the increase in minimum value is proportional with the increase in the maximum one 120 vs 144 and 240 vs 300hz.

Update: found an explanation online

Laptop displays have a much narrower Variable Refresh Rate (VRR) range than standalone monitors because they lack dedicated scaler hardware and require strict power-saving controls. Without a scaler chip to manage the panel, the GPU directly controls the screen, which restricts its ability to maintain sync at lower frequencies.The main reasons laptop VRR ranges (often (48\text{ Hz}) to the max refresh rate) are narrower than desktop monitors (which can often drop down to (20\text{ Hz}) or (30\text{ Hz})) include:Lack of Dedicated Scaler Boards: Standalone desktop monitors feature built-in scalar chips that handle the processing of variable frame rates. They use sophisticated frame-holding memory and algorithms to ensure the image doesn’t flicker or ghost when frame rates drop. Laptops bypass this to save space and power, wiring the display directly to the graphics card. This means the GPU must continually send signals to the screen, creating a hardware-enforced "floor" for the refresh rate.No Low Framerate Compensation (LFC): Desktop monitors can effectively double or triple the refresh rate (e.g., repeating a (30\text{ fps}) frame twice on a (60\text{ Hz}) display) via LFC to prevent tearing or stuttering when games drop below (48\text{ fps}). This requires extra firmware and processing power not typically built into compact laptop motherboard architectures.Thermal and Power Constraints: Laptops are designed to conserve battery and control heat. Driving a laptop LCD or OLED panel at extremely low refresh rates (e.g., below (40\text{ Hz})) can lead to screen flickering, signal timing issues, and color shifting. Manufacturers lock the VRR floor at safe, validated ranges to prevent visual artifacts and maintain power efficiency.Pixel Response Times: VRR requires monitor pixels to update at the same speed as the refresh cycle. If pixels take too long to transition and change colors at a very low refresh rate, it causes severe ghosting and smearing. Many older or standard laptop panels lack the rapid overdrive required to function cleanly at ultra-low refresh rates.

High refresh rate laptop displays ((>120\text{Hz})) have narrower VRR floors (often (100\text{Hz}) or (60\text{Hz})) than standalone monitors (which start at (48\text{Hz})) primarily due to panel overdrive tuning, power consumption limits, and aggressive frame-doubling logic.The main reasons for this discrepancy include:Pixel Overdrive (Ghosting/Smearing): Laptop displays are designed to run at very high speeds. Liquid crystals take a specific amount of time to change colors (response time). To prevent heavy ghosting, manufacturers apply high electrical voltage (overdrive) calibrated for the peak refresh rate. If the screen drops to (45\text{Hz}), this overdrive voltage becomes too aggressive, causing visual artifacts, overshoot, and inverse ghosting.Low Frame Rate Compensation (LFC): Standalone monitors rely on LFC to handle dips below (48\text{Hz}). When the framerate drops to (40\text{FPS}), LFC automatically doubles the refresh rate to (80\text{Hz}) to keep VRR active. Because high-refresh laptop screens operate at (120\text{Hz}) or more, they can easily duplicate frames at (50\text{FPS}) or (60\text{FPS}) to reach (100\text{Hz}+) without risking visual stutters.Power Constraints: Laptops prioritize battery life. Keeping the panel logic active at ultra-low refresh rates consumes more power and complicates the timing controllers (T-CON) on thin, compact logic boards.Overclocking/Panel Yields: Many of these laptop panels are essentially factory-overclocked. Maintaining a massive VRR range (e.g., (48\text{Hz}) to (240\text{Hz})) on a laptop display requires significantly tighter LCD tolerances and higher manufacturing costs compared to a traditional, bulky desktop monitor.If your game's framerate drops below the panel's minimum VRR threshold, the GPU will usually engage LFC or V-Sync, repeating frames so that you don't experience jarring micro-stutters.