System: Axioo Pongo 725 laptop (Clevo NP50RNA) - i7-12650H, UHD Graphics 24EU (ADL GT1), RTX 2050 (dGPU not involved here)
BIOS: INSYDE Corp. v1.07.01TAX
Kernel: 6.18.32-2-lts (Arch), also tested mainline
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iGPU actual frequency (gt_act_freq_mhz) is stuck at exactly 300 MHz (RP1 = efficient frequency) under any GPU load. Requested frequency (gt_cur_freq_mhz) reports ~983 MHz, P-state requests are at RP0 (1400 MHz), but the hardware never goes above 300 MHz. ~30 FPS in light 2D games vs 70–121 FPS on Windows.
I've tried:
- Editing GRUB parameter such as i915.enable_guc=0, i915.enable_guc=3, i915.enable_dc=0, i915.disable_power_well=0 | acpi_osi=!Windows 2020 (and acpi_osi=!) | intel_idle.max_cstate=1..
- Driver/sysfs experiments such as writing to gt_min_freq_mhz (Ignored by GuC), slpc_ignore_eff_freq=1 (Made it worse, dropped to 100Mhz RPn), slpc_power_profile only accepts "power_saving" (Base confirmed currently active, and performance return EINVAL).

I also checked UEFI variable checks but I believe they all seems normal:

SaSetup 0x3F (Max GT freq) = FF (no limit)
SaSetup 0x40 (Disable GT turbo) = 00 (turbo allowed)
CpuSetup 0x13 (Boot perf mode) = 01 (Max Non-Turbo)
CpuSetup 0x3C (Energy Efficient P-state) = 01 (enabled)
CpuSetup 0x1D5 (Energy Efficient Turbo) = 01 (enabled)
How about throttling? Checked the temp while doing heavy stuff, and the temperature was fine, around 47-57c. The i915 driver report are saying the same too: throttle_reason_pl1: 0, pl2: 0, pl4: 0, prochot: 0, ratl: 0, status: 0, thermal: 0, vr_tdc: 0, vr_thermalert: 0.
Driver knows correct RP values: RP0=1400, RP1=300, RPn=100, boost=1400.
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Any help would be appreciated, thank you.