This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1747273 and then change the status of the bug to 'Confirmed'. If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'. This change has been made by an automated script, maintained by the Ubuntu Kernel Team. ** Changed in: linux (Ubuntu) Status: New => Incomplete ** Tags added: artful -- 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/1747273 Title: Can not control brightness on Thinkpad P51 Status in linux package in Ubuntu: Incomplete Bug description: I can not modify the screen brightness in Ubuntu 17.10. Controls aside, the classes in `proc` are either not available or non- functional depending on what arguments I provide in GRUB_CMDLINE_LINUX_DEFAULT. On a parallel installation (Ubuntu 16.04.3), brightness control works flawlessly. System Information ------------------ $ lsb_release -rd Description: Ubuntu 17.10 Release: 17.10 $ lspci 00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v6/7th Gen Core Processor Host Bridge/DRAM Registers (rev 05) 00:01.0 PCI bridge: Intel Corporation Skylake PCIe Controller (x16) (rev 05) 00:08.0 System peripheral: Intel Corporation Skylake Gaussian Mixture Model 00:14.0 USB controller: Intel Corporation Sunrise Point-H USB 3.0 xHCI Controller (rev 31) 00:14.2 Signal processing controller: Intel Corporation Sunrise Point-H Thermal subsystem (rev 31) 00:15.0 Signal processing controller: Intel Corporation Sunrise Point-H Serial IO I2C Controller #0 (rev 31) 00:16.0 Communication controller: Intel Corporation Sunrise Point-H CSME HECI #1 (rev 31) 00:17.0 SATA controller: Intel Corporation Sunrise Point-H SATA controller [AHCI mode] (rev 31) 00:1b.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Root Port #17 (rev f1) 00:1c.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #1 (rev f1) 00:1c.2 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #3 (rev f1) 00:1c.4 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #5 (rev f1) 00:1d.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #9 (rev f1) 00:1d.4 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #13 (rev f1) 00:1f.0 ISA bridge: Intel Corporation Sunrise Point-H LPC Controller (rev 31) 00:1f.2 Memory controller: Intel Corporation Sunrise Point-H PMC (rev 31) 00:1f.3 Audio device: Intel Corporation Device a171 (rev 31) 00:1f.4 SMBus: Intel Corporation Sunrise Point-H SMBus (rev 31) 00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (5) I219-V (rev 31) 01:00.0 VGA compatible controller: NVIDIA Corporation GM107GLM [Quadro M1200 Mobile] (rev a2) 01:00.1 Audio device: NVIDIA Corporation Device 0fbc (rev a1) 02:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM961/PM961 04:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78) 3e:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM961/PM961 # with GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi=Linux thinkpad-acpi.brightness_enable=1": $ grep . -R /sys/class/backlight/thinkpad_screen/* /sys/class/backlight/thinkpad_screen/actual_brightness:0 /sys/class/backlight/thinkpad_screen/bl_power:0 /sys/class/backlight/thinkpad_screen/brightness:11 /sys/class/backlight/thinkpad_screen/max_brightness:15 /sys/class/backlight/thinkpad_screen/power/runtime_active_kids:0 /sys/class/backlight/thinkpad_screen/power/runtime_suspended_time:0 grep: /sys/class/backlight/thinkpad_screen/power/autosuspend_delay_ms: Input/output error /sys/class/backlight/thinkpad_screen/power/runtime_enabled:disabled /sys/class/backlight/thinkpad_screen/power/runtime_active_time:0 /sys/class/backlight/thinkpad_screen/power/control:auto /sys/class/backlight/thinkpad_screen/power/async:disabled /sys/class/backlight/thinkpad_screen/power/runtime_usage:0 /sys/class/backlight/thinkpad_screen/power/runtime_status:unsupported grep: warning: /sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/subsystem: recursive directory loop /sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/power/runtime_active_kids:0 /sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/power/runtime_suspended_time:0 grep: /sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/power/autosuspend_delay_ms: Input/output error /sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/power/runtime_enabled:disabled /sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/power/runtime_active_time:0 /sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/power/control:auto /sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/power/async:disabled /sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/power/runtime_usage:0 /sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/power/runtime_status:unsupported /sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/max_brightness:15 /sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/type:platform /sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/brightness:11 /sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/bl_power:0 /sys/class/backlight/thinkpad_screen/subsystem/thinkpad_screen/actual_brightness:0 /sys/class/backlight/thinkpad_screen/type:platform 3f:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader (rev 01) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1747273/+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