Very poor graphic performance from integrated GPU Intel UHD620

General system
#1

I’ve ran two benchmarking programs (glmark2 and hardinfo) on my old PC with an i5-3317U processor with a HD4000 integrated graphics chip and compared them with the same benchmarks on my new PC with an UHD620 integrated graphics chip.

The results are puzzling:
HD4000: 997 in glmark2 and 10834 in hardinfo
UHD620: 801 in glmark2 and 8043 in hardinfo (in glmark2, the benchmark windows even stays frozen on the first frame while the test runs)

On both systems driver is xf86-video-intel as far as I can tell the same memory size 256MB is allocated on both systems. Both have i915 module enabled.

Here’s lspci output

HD4000

00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) (prog-if 00 [VGA controller])
Subsystem: Samsung Electronics Co Ltd 3rd Gen Core processor Graphics Controller
Flags: bus master, fast devsel, latency 0, IRQ 32
Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 3000 [size=64]
[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
Kernel driver in use: i915
Kernel modules: i915

UHD620

00:02.0 VGA compatible controller: Intel Corporation Device 9bca (rev 04) (prog-if 00 [VGA controller])
	DeviceName: Onboard - Video
	Subsystem: Micro-Star International Co., Ltd. [MSI] Device 129c
	Flags: bus master, fast devsel, latency 0, IRQ 192
	Memory at d3000000 (64-bit, non-prefetchable) [size=16M]
	Memory at 30000000 (64-bit, prefetchable) [size=256M]
	I/O ports at 4000 [size=64]
	[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
	Capabilities: [40] Vendor Specific Information: Len=0c <?>
	Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
	Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit-
	Capabilities: [d0] Power Management version 2
	Capabilities: [100] Process Address Space ID (PASID)
	Capabilities: [200] Address Translation Service (ATS)
	Capabilities: [300] Page Request Interface (PRI)
	Kernel driver in use: i915
	Kernel modules: i915

I’ve used Optimus Manager to completely disable the NVIDIA card on the new PC.
Any idea how I could improve the performance of the new GPU? Theoretically it should be at least twice as performant as the old one.

#2

On some machines it is possible to uninstall the xf86-video-intel package. Not sure if that boots on your machine, but probably worth a try (and you must have means to re-install the package it if it doesn’t boot).

And in fact I don’t know how Optimus Manager affects the whole thing…

#3

So, I removed the xf86-video-intel package. Now the benchmarks read: 1832 in glmark2 but 6997 in hardinfo, strange…
Also glmark2 crashed twice.