Prior of Linux 5.10, the screen backlight couldn't be adjusted without recompiling the kernel (see Debian bug #971953).Ī (partial) workaround was to adjust the screen brightness using xrandr (provided by x11-xserver-utils), but with not impact on the power consumption whatsoever (no battery saving): The following information is kept here only for future reference. In Debian Bullseye the screen backlight is fully controllable and requires no manual configuration. GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX intel_idle.max_cstate=1" # WARNING: increases power consumption considerably # Prevent random freezes on Intel Bay Trail CPUs To permanently set this parameter, add the file /etc/default/grub.d/intel-bay-trail-cstate-issue.cfg containing these lines: when using the Debian installer or at the very first boot of the system), when in Grub press "e" after selecting the entry you want to boot and then add the parameter at the end of the "linux." line. To temporary set this parameter at boot (e.g. Should random freezes still occur, the only work around which has been reported to work consistently is setting the intel_idle.max_cstate=1 kernel parameter which has the drawback of increasing power consumption considerably. The bug has been reported to have been fixed, or at least mitigated, in Linux kernel version 5. Devices with Intel Bay Trail CPUs have been affected by this bug which has been known to cause seemingly random freezes of the system.
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