On Mon, Oct 6, 2025 at 5:30 PM Aradhya Bhatia <[email protected]> wrote: > > +rockchip maintainers > > Hi Vicente, all,
Hi everybody, please, can some expert on this platform take a look at this bug? Regards, Vicente. > I went through the drivers and the affected areas in the gru-kevin > chromebook pipeline last week, but nothing has stood out. > > > Pipeline: > > rockchip,display-subsystem / rk3399-vop (Big/Lite) (CRTC) -> > rk3399-edp (Encoder) -> analogix_dp_core (Bridge) -> > sharp,lq123p (edp-panel) > > I am unable to debug this further since I do not have the hardware. > > I could use some help, especially from folks who understand the hardware > requirements better. > > > On 11/09/25 09:01, Aradhya Bhatia wrote: > > Hi Vicente, > > > > Thank you for the bisection and reporting the issue. > > > > On 10/09/25 16:17, Vicente Bergas wrote: > >> Hi, > >> this patch causes a regression. It has been reported in > >> https://bugzilla.kernel.org/show_bug.cgi?id=220554 > >> > >> It affects the gru/kevin platform (arm64,RK3399) with the Panfrost DRM > >> driver. > > > > I believe the Panfrost DRM driver may only be for the GPU. > > > > Based on the dts files in arm64/rockchip/, this is the pipeline of the > > gru-kevin setup that I understand. > > > > rk3399-vop (Big/Lite) -> rk3399-edp -> sharp,lq123p (edp-panel) > > > > The setup seems to be using the drm/rockchip drivers for the display > > controller and for the bridge. > > > >> > >> When it boots in console mode, the blinking of the cursor keeps the > >> display on. > >> If it is turned off via /sys/class/graphics/fbcon/cursor_blink, then > >> the display briefly shows each key press presented on screen for less > >> than one second and then powers off. > >> > >> When starting the graphical mode (wayland), if there are no > >> applications drawing on the screen, the only way to keep the display > >> on is by continuously moving the mouse. > >> > > > > Okay! > > > > I will have a look through the drivers. In the meanwhile, please do > > report back if you find any other observations. > > > > > > -- > Regards > Aradhya >
