Hello, I understand you may be busy, however, could you please confirm you have received my request or give me a link to a tracking ticket ?
Sorry for disturbing, and thank you very much -- Nov 23, 2020, 16:06 by prog-amat...@tutamail.com: > Hello, the brightness doesn't work (cursor moves but not real brightness). > Could you please help or at least forward to the relevant member ? Thank you > very much for your kind help. > Error message> :Some messages appear during boot (after grub) : > > i915 0000:00:02.0 : [drm] *ERROR* Failed to get the PMIC PWM chip > i915 0000:00:02.0 : [drm] *ERROR* [CRTC:51:pipe A] mismatch in pixel_rate > i915 0000:00:02.0 : [drm] *ERROR* [CRTC:51:pipe A] mismatch in > hw_adjusted_mode.crtc_clock > i915 0000:00:02.0 : [drm] *ERROR* [CRTC:51:pipe A] mismatch in port_clock > Information about device and version> : My device is an HP Pro Tablet 608 > (CPU : Intel Atom X5-Z8500, 64 bits, RAM : 4GB)I am using Debian Testing > GNU/Linux 5.9 (but this bug appears also in 5.8, and Stable version), kernel > 5.9.0-1-amd64, GNOME 3.38.1 under Wayland. > Possible solution after test with Fedora (GNOME/Wayland/similar kernel)> > :Brightness can be controlled fine. It seems that this bug has been already > fixed in Fedora with patches (c.f. : > > https://patchwork.freedesktop.org/series/69686/> ). Summary of this patch is > below : > "drivers/acpi/acpi_lpss.c and/or driver/mfd/intel_soc_pmic_core.c > registers a pwm with the generic name "pwm_backlight" and then > the i915 panel code makes a pwm_get(dev, "pwm_backlight"). > > Some devices use a PMIC Crystal Cove, but the LCD screen is connected to > the PWM SoC/LPSS controller (and the VBT indicates it correctly), > so here the heuristics in drivers/acpi/acpi_lpss.c and > mfd/intel_soc_pmic_core.c fail. > > This series of patches renames the PWM consultations recorded by the > LPSS / intel_soc_pmic_core.c code from "pwm_backlight" to > "pwm_soc_backlight" resp. "pwm_pmic_backlight" and, in the case of LPSS, > also removes the heuristic. This, combined with teaching the > i915 panel to call pwm_get for the right search name according to the > bits of the VBT, solves this problem." >
