** Bug watch added: freedesktop.org Bugzilla #108703 https://bugs.freedesktop.org/show_bug.cgi?id=108703
** Also affects: linux via https://bugs.freedesktop.org/show_bug.cgi?id=108703 Importance: Unknown Status: Unknown -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1782177 Title: Screen sometimes jumps to full brightness on resume from suspend Status in Linux: Unknown Status in linux package in Ubuntu: Incomplete Bug description: At night, I usually turn my brightness down as far as it will go using the brightness keys. This makes it dim, but visible and not off. When I walk away for a while, the screen goes to sleep, and when I come back and move the mouse, the screen jumps to full brightness, which is very unpleasant at night. Investigating, it seems that the brightness in intel_backlight is getting reset to 4437, but the one in acpi_video0 reads 0. $ for file in brightness max_brightness actual_brightness; > do > for directory in /sys/class/backlight/intel_backlight/ /sys/class/backlight/acpi_video0/ > do > echo $directory$file : $(cat $directory$file) > done > done /sys/class/backlight/intel_backlight/brightness : 4437 /sys/class/backlight/acpi_video0/brightness : 0 /sys/class/backlight/intel_backlight/max_brightness : 4437 /sys/class/backlight/acpi_video0/max_brightness : 15 /sys/class/backlight/intel_backlight/actual_brightness : 4437 /sys/class/backlight/acpi_video0/actual_brightness : 0 After I press the button to increase the brightness one notch, they are back in sync, and then I can turn it back down as well. $ for file in brightness max_brightness actual_brightness; > do > for directory in /sys/class/backlight/intel_backlight/ /sys/class/backlight/acpi_video0/ > do > echo $directory$file : $(cat $directory$file) > done > done /sys/class/backlight/intel_backlight/brightness : 53 /sys/class/backlight/acpi_video0/brightness : 1 /sys/class/backlight/intel_backlight/max_brightness : 4437 /sys/class/backlight/acpi_video0/max_brightness : 15 /sys/class/backlight/intel_backlight/actual_brightness : 53 /sys/class/backlight/acpi_video0/actual_brightness : 1 This is on a fresh install of xubuntu 18.04. Seems like a regression from 16.04, which I ran on the same laptop without this issue. To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1782177/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
