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npit

Member

Registered: 2016-07-01

Posts: 17

Screens turning on and off, Permission denied opening /dev/i2c-5

As per the title, using nvidia 570.133.07-2, gtx 1660, KDE plasma6.

Potentially relevant info:

Edit: Logging in with plasma-X11 stops the flickering.

journalctl -xe

Απρ 03 16:48:55 cc org_kde_powerdevil[1048]: [  4296] (dw_recheck_displays_func) Recheck interval: Slept for 200 millisec
Απρ 03 16:49:02 cc kwin_wayland[860]: kwin_core: KWin::LayerShellV1Window doesn't support setting maximized state
Απρ 03 16:49:02 cc kwin_wayland[860]: kwin_core: KWin::LayerShellV1Window doesn't support setting fullscreen state
Απρ 03 16:49:02 cc plasmashell[1015]: kde.plasmashell: requesting unexisting screen available rect -1
Απρ 03 16:49:02 cc plasmashell[1015]: kde.plasmashell: requesting unexisting screen available rect -1
Απρ 03 16:49:02 cc plasmashell[1015]: kde.plasmashell: requesting unexisting screen available rect -1
Απρ 03 16:49:02 cc plasmashell[1015]: kde.plasmashell: requesting unexisting screen available rect -1
Απρ 03 16:49:02 cc plasmashell[1015]: kde.plasmashell: requesting unexisting screen available rect -1
Απρ 03 16:49:02 cc plasmashell[1015]: kde.plasmashell: requesting unexisting screen available rect -1
Απρ 03 16:49:02 cc plasmashell[1015]: kde.plasmashell: requesting unexisting screen available rect -1
Απρ 03 16:49:02 cc plasmashell[1015]: kde.plasmashell: requesting unexisting screen available rect -1
Απρ 03 16:49:03 cc org_kde_powerdevil[1048]: [  4297] Device /dev/i2c-5 lacks R/W permissions
Απρ 03 16:49:03 cc org_kde_powerdevil[1048]: [  4297] Device /dev/i2c-5 lacks R/W permissions
Απρ 03 16:49:03 cc org_kde_powerdevil[1048]: [  4297] Removing connected display on bus 2
Απρ 03 16:49:03 cc org_kde_powerdevil[1048]: [  4297] Emitting DDCA_Display_Status_Event[1103.881:  DDCA_EVENT_DISPLAY_DISCONNECTED, card1-DP-2, dref: DDCA_Display_Ref[265], io_path:/dev/i2c-2, ddc working: fa>
Απρ 03 16:49:03 cc org_kde_powerdevil[1048]: [  4297] libddcutil callback thread 0x79f94001d4f0 started
Απρ 03 16:49:03 cc org_kde_powerdevil[1048]: [  4297] Started 1 event callback thread(s)
Απρ 03 16:49:06 cc kwin_wayland[860]: kwin_core: KWin::LayerShellV1Window doesn't support setting maximized state
Απρ 03 16:49:06 cc kwin_wayland[860]: kwin_core: KWin::LayerShellV1Window doesn't support setting fullscreen state
Απρ 03 16:49:06 cc org_kde_powerdevil[1048]: [  4297] Device /dev/i2c-5 lacks R/W permissions
Απρ 03 16:49:06 cc org_kde_powerdevil[1048]: [  4297] Adding connected display with bus 2
Απρ 03 16:49:06 cc kwin_wayland[860]: kwin_core: Cannot grant a token to KWin::ClientConnection(0x64b04f0c9a70)
Απρ 03 16:49:06 cc org_kde_powerdevil[1048]: [  4297] Emitting DDCA_Display_Status_Event[1107.346:  DDCA_EVENT_DISPLAY_CONNECTED, card1-DP-2, dref: DDCA_Display_Ref[267], io_path:/dev/i2c-2, ddc working: true]
Απρ 03 16:49:06 cc org_kde_powerdevil[1048]: [  4297] libddcutil callback thread 0x79f9400177e0 started
Απρ 03 16:49:06 cc org_kde_powerdevil[1048]: [  4297] Started 1 event callback thread(s)
Απρ 03 16:49:06 cc org_kde_powerdevil[1048]: [  1048] Quiescing libddcutil API...
Απρ 03 16:49:06 cc org_kde_powerdevil[1048]: [  1048] Quiesce libddcutil API complete
Απρ 03 16:49:06 cc org_kde_powerdevil[1048]: [  1048] Display redetection starting.
Απρ 03 16:49:06 cc org_kde_powerdevil[1048]: [  4296] recheck thread terminating because watch thread terminated
Απρ 03 16:49:06 cc org_kde_powerdevil[1048]: [  1048] Watch thread terminated.
Απρ 03 16:49:07 cc org_kde_powerdevil[1048]: [  1048] Device /dev/i2c-5 lacks R/W permissions
Απρ 03 16:49:07 cc org_kde_powerdevil[1048]: [  1048] Watching for display connection changes, resolved watch mode = Watch_Mode_Xevent, poll loop interval = 100 millisec
Απρ 03 16:49:07 cc org_kde_powerdevil[1048]: [  1048]                                          extra_stabilization_millisec: 0,  stabilization_poll_millisec: 100
Απρ 03 16:49:07 cc org_kde_powerdevil[1048]: Error(s) opening ddc devices
Απρ 03 16:49:07 cc org_kde_powerdevil[1048]: Error EACCES(-13): Permission denied opening /dev/i2c-5
Απρ 03 16:49:07 cc org_kde_powerdevil[1048]: [  1048] libddcutil recheck thread (nil) started
Απρ 03 16:49:07 cc org_kde_powerdevil[1048]: [  1048] libddcutil watch thread 0x638cf2bf1f60 started
Απρ 03 16:49:07 cc org_kde_powerdevil[1048]: [  1048] Display redetection finished.
Απρ 03 16:49:07 cc org_kde_powerdevil[1048]: [  1048] Unquiescing libddcutil API...
Απρ 03 16:49:07 cc org_kde_powerdevil[1048]: [  1048] Error(s) opening ddc devices
Απρ 03 16:49:07 cc org_kde_powerdevil[1048]: [  1048] Error EACCES(-13): Permission denied opening /dev/i2c-5

/usr/bin/ls -l /dev/i2c*

crw-rw----+ 1 root i2c 89, 0 Απρ   3 16:30 /dev/i2c-0
crw-rw----+ 1 root i2c 89, 1 Απρ   3 16:30 /dev/i2c-1
crw-rw----+ 1 root i2c 89, 2 Απρ   3 16:30 /dev/i2c-2
crw-rw----+ 1 root i2c 89, 3 Απρ   3 16:30 /dev/i2c-3
crw-rw----+ 1 root i2c 89, 4 Απρ   3 16:30 /dev/i2c-4
crw-rw----  1 root i2c 89, 5 Απρ   3 16:30 /dev/i2c-5
crw-rw----  1 root i2c 89, 6 Απρ   3 16:30 /dev/i2c-6
crw-rw----  1 root i2c 89, 7 Απρ   3 16:30 /dev/i2c-7
crw-rw----  1 root i2c 89, 8 Απρ   3 16:30 /dev/i2c-8

Tried without effect:
- Setting 666 permissions to i2c-5
- Adding user to i2c group

Last edited by npit (2025-04-03 16:15:55)