http://bugzilla.opensuse.org/show_bug.cgi?id=1040857 Bug ID: 1040857 Summary: Screen brightness on skylake + optimus laptop with kernel 4.11 Classification: openSUSE Product: openSUSE Tumbleweed Version: Current Hardware: x86-64 OS: SUSE Other Status: NEW Severity: Major Priority: P5 - None Component: Kernel Assignee: kernel-maintainers@forge.provo.novell.com Reporter: pipo2004@gmail.com QA Contact: qa-bugs@suse.de Found By: --- Blocker: --- User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.96 Safari/537.36 Build Identifier: On kernel 4.10 the backlight on my skylake + optimus (nvidia gtx960m) worked perfectly. But with kernel 4.11, in /sys/class/backlight, an acpi_video0 entry appears instead of intel_backlight. Echoing a value into the brightness property is accepted with kernel 4.11, but does not result into a change of brightness. Boot options such as acpi_osi=Linux and other options such as video.use_native_backlight=1 do not result in fixing the problem. On kernel 4.10, lspci -v shows the following for graphics hardware: 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06) (prog-if 00 [VGA controller]) Subsystem: CLEVO/KAPOK Computer Device 1501 Flags: bus master, fast devsel, latency 0, IRQ 126 Memory at dd000000 (64-bit, non-prefetchable) [size=16M] Memory at a0000000 (64-bit, prefetchable) [size=512M] I/O ports at f000 [size=64] [virtual] Expansion ROM at 000c0000 [disabled] [size=128K] Capabilities: [40] Vendor Specific Information: Len=0c <?> Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00 Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit- Capabilities: [d0] Power Management version 2 Capabilities: [100] Process Address Space ID (PASID) Capabilities: [200] Address Translation Service (ATS) Capabilities: [300] Page Request Interface (PRI) Kernel driver in use: i915 Kernel modules: i915 01:00.0 VGA compatible controller: NVIDIA Corporation GM107M [GeForce GTX 960M] (rev a2) (prog-if 00 [VGA controller]) Subsystem: CLEVO/KAPOK Computer Device 1501 Flags: bus master, fast devsel, latency 0, IRQ 16 Memory at de000000 (32-bit, non-prefetchable) [size=16M] Memory at c0000000 (64-bit, prefetchable) [size=256M] Memory at d0000000 (64-bit, prefetchable) [size=32M] I/O ports at e000 [size=128] Expansion ROM at df000000 [disabled] [size=512K] Capabilities: [60] Power Management version 3 Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+ Capabilities: [78] Express Legacy Endpoint, MSI 00 Capabilities: [100] Virtual Channel Capabilities: [250] Latency Tolerance Reporting Capabilities: [258] L1 PM Substates Capabilities: [128] Power Budgeting <?> Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 Capabilities: [900] #19 Kernel driver in use: nvidia Kernel modules: nouveau, nvidia_drm, nvidia Reproducible: Always Steps to Reproduce: 1. Just boot the system with any kernel 4.11 Actual Results: /sys/class/backlight/acpi_video0 appears. Echoing a value into /sys/class/backlight/acpi_video0/brightness does not change the brightness of the screen. Expected Results: /sys/class/backlight/intel_backlight This is what I get with kernel 4.10.13-1 Echoing a value into /sys/class/backlight/intel_backlight/brightness does change the brightness -- You are receiving this mail because: You are on the CC list for the bug.