Arch Linux

drishal

Member

Registered: 2020-10-25

Posts: 18

i915 lag

with the latest kernel 5.9.1 there seems to be a lot of lags and frame drops especially with gnome and kde...the system becomes far smoother with "performance" governor however it struggles a lot at powersave
I have tried the following options in /etc/modprobe.d/i915.conf:
options i915 enable_fbc=1
options i915 disable_power_well=1
options i915 enable_psr=0
options i915 enable_guc=2
with some difference on kde but horrible frame drops on gnome...can you pls help me out?
specs:
Intel Core i5-8265U
Mesa Intel(R) UHD Graphics 620

blispx

Member

Registered: 2017-11-29

Posts: 53

Re: i915 lag

If tearing occurs, try adding TearFree to your xorg configuration

fbc & guc/huc is considered unsafe in the new kernel and is turned off by default

[    1.333708] Setting dangerous option enable_guc - tainting kernel
[    1.333710] Setting dangerous option enable_fbc - tainting kernel

Last edited by blispx (2020-10-25 17:34:52)

drishal

Member

Registered: 2020-10-25

Posts: 18

Re: i915 lag

no....the screen lags  is still there in gnome (but far less in kde on same system and os)

drishal@archlinux ~ % sudo grep -H '' /sys/module/i915/parameters/*
/sys/module/i915/parameters/disable_display:N
/sys/module/i915/parameters/disable_power_well:1
/symodule/i915/parameters/dmc_firmware_path:(null)
/sys/module/i915/parameters/edp_vswing:0
/sys/module/i915/parameters/enable_dc:-1
/sys/module/i915/parameters/enable_dpcd_backlight:-1
/sys/module/i915/parameters/enable_dp_mst:Y
/sys/module/i915/parameters/enable_fbc:-1
/sys/module/i915/parameters/enable_guc:0
/sys/module/i915/parameters/enable_gvt:N
/sys/module/i915/parameters/enable_hangcheck:Y
/sys/module/i915/parameters/enable_ips:1
/sys/module/i915/parameters/enable_psr:0
/sys/module/i915/parameters/error_capture:Y
/sys/module/i915/parameters/fastboot:-1
/sys/module/i915/parameters/force_probe:*
/sys/module/i915/parameters/force_reset_modeset_test:N
/sys/module/i915/parameters/guc_firmware_path:(null)
/sys/module/i915/parameters/guc_log_level:-1
/sys/module/i915/parameters/huc_firmware_path:(null)
/sys/module/i915/parameters/invert_brightness:0
/sys/module/i915/parameters/load_detect_test:N
/sys/module/i915/parameters/lvds_channel_mode:0
/sys/module/i915/parameters/mmio_debug:0
/sys/module/i915/parameters/modeset:-1
/sys/module/i915/parameters/nuclear_pageflip:N
/sys/module/i915/parameters/panel_use_ssc:-1
/sys/module/i915/parameters/psr_safest_params:N
/sys/module/i915/parameters/reset:3
/sys/module/i915/parameters/vbt_firmware:(null)
/sys/module/i915/parameters/vbt_sdvo_panel_type:-1
/sys/module/i915/parameters/verbose_state_checks:Y
s/

and:

drishal@archlinux ~ % cat /etc/modprobe.d/i915.conf       
options i915 disable_power_well=1
options i915 enable_psr=0

and also:

drishal@archlinux ~ % dmesg  | grep "i915"
[    0.994016] i915 0000:00:02.0: vgaarb: deactivate vga console
[    0.997821] i915 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem
[    0.998464] i915 0000:00:02.0: [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin (v1.4)
[    2.250389] [drm] Initialized i915 1.6.0 20200715 for 0000:00:02.0 on minor 0
[    2.287787] fbcon: i915drmfb (fb0) is primary device
[    2.315578] i915 0000:00:02.0: [drm] fb0: i915drmfb frame buffer device
[   21.674083] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[   22.029829] mei_hdcp 0000:00:16.0-b638ab7e-94e2-4ea2-a552-d1c54b627f04: bound 0000:00:02.0 (ops i915_hdcp_component_ops [i915])
drishal@archlinux ~ % 

just in case