Description of problem: Screen brighness is always at max after suspend, even if it was at minimum before suspend. This is under wayland on F25. It used to work for years, not anymore. Version-Release number of selected component (if applicable): Linux ikzen 4.9.5-200.fc25.x86_64 #1 SMP Fri Jan 20 12:24:16 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux gnome-power-manager-3.22.2-1.fc25.x86_64 How reproducible: Always Steps to Reproduce: 1. Adjust the brightness to min 2. Close the lid to make laptop suspend 3. wake up Actual results: Screen brightness is at maximum Expected results: Screen brightness should be restored to whatever value it was before suspend. Additional info: Here are value dumps from sys before and after the suspend. See the first value in intel dir doesn't remain, only one in acpi_video0 does: before --------------------- [ikke@ikzen ~]$ grep -s . /sys/class/backlight/intel_backlight/* /sys/class/backlight/intel_backlight/actual_brightness:68 /sys/class/backlight/intel_backlight/bl_power:0 /sys/class/backlight/intel_backlight/brightness:976 /sys/class/backlight/intel_backlight/max_brightness:976 /sys/class/backlight/intel_backlight/type:raw [ikke@ikzen ~]$ grep -s . /sys/class/backlight/acpi_video0/* /sys/class/backlight/acpi_video0/actual_brightness:0 /sys/class/backlight/acpi_video0/bl_power:0 /sys/class/backlight/acpi_video0/brightness:0 /sys/class/backlight/acpi_video0/max_brightness:10 /sys/class/backlight/acpi_video0/type:firmware --------------------- after --------------------- [ikke@ikzen ~]$ grep . /sys/class/backlight/intel_backlight/* /sys/class/backlight/intel_backlight/actual_brightness:976 /sys/class/backlight/intel_backlight/bl_power:0 /sys/class/backlight/intel_backlight/brightness:976 /sys/class/backlight/intel_backlight/max_brightness:976 /sys/class/backlight/intel_backlight/type:raw [ikke@ikzen ~]$ grep -s . /sys/class/backlight/acpi_video0/* /sys/class/backlight/acpi_video0/actual_brightness:0 /sys/class/backlight/acpi_video0/bl_power:0 /sys/class/backlight/acpi_video0/brightness:0 /sys/class/backlight/acpi_video0/max_brightness:10 /sys/class/backlight/acpi_video0/type:firmware --------------------- [ikke@ikzen ~]$ lspci 00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09) 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) 00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04) 00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05) 00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b5) 00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2 (rev b5) 00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 (rev b5) 00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 05) 00:1f.0 ISA bridge: Intel Corporation QS67 Express Chipset Family LPC Controller (rev 05) 00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller (rev 05) 00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 05) 02:00.0 Network controller: Qualcomm Atheros AR9485 Wireless Network Adapter (rev 01) 03:00.0 USB controller: Fresco Logic FL1009 USB 3.0 Host Controller (rev 02) [ikke@ikzen ~]$ lspci -n 00:00.0 0600: 8086:0104 (rev 09) 00:02.0 0300: 8086:0116 (rev 09) 00:16.0 0780: 8086:1c3a (rev 04) 00:1b.0 0403: 8086:1c20 (rev 05) 00:1c.0 0604: 8086:1c10 (rev b5) 00:1c.1 0604: 8086:1c12 (rev b5) 00:1c.3 0604: 8086:1c16 (rev b5) 00:1d.0 0c03: 8086:1c26 (rev 05) 00:1f.0 0601: 8086:1c4d (rev 05) 00:1f.2 0106: 8086:1c03 (rev 05) 00:1f.3 0c05: 8086:1c22 (rev 05) 02:00.0 0280: 168c:0032 (rev 01) 03:00.0 0c03: 1b73:1009 (rev 02)
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