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[Bug 1040857] New: Screen brightness on skylake + optimus laptop with kernel 4.11
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Thu, 25 May 2017 21:35:41 +0000
  • Message-id: <bug-1040857-21960@http.bugzilla.opensuse.org/>
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@xxxxxxxxxxxxxxxxxxxxxx
Reporter: pipo2004@xxxxxxxxx
QA Contact: qa-bugs@xxxxxxx
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

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