Description of problem: With newer kernels, namely 4.15.17-300.fc27.x86_64 and 4.16.3-200.fc27.x86_64 the keys to change the brightness of my laptop screen do not work any more. Booting older kernels like 4.15.16-300.fc27.x86_64 or before, the brightness keys do work. So it must be a regression with a recent kernel update. Version-Release number of selected component (if applicable): 4.15.17-300.fc27.x86_64 4.16.3-200.fc27.x86_64 How reproducible: Reproducible every time. When I select a new kernel in grub, then the brightness keys never work. When I select an old kernel in grub, then the brightness keys always work. Steps to Reproduce: 1. Boot computer with new kernel 2. Login 3. Try the keyboard keys to increase/decrease screen brightness Actual results: Nothing happens, screen brightness stays fixed. Expected results: Screen gets brighter/darker. Additional info: Laptop is about 5 years old, MSI, Intel Core i7-3630QM. Never had an issue with the screen brightness in old versions of fedora. This issue severely impacts battery life and the possibility to work in very bright/dark environments.
Hi, Thanks for the bug report. One commit that jumped out at me between 4.15.16 and 4.15.17 is 965736ee654db8bb009a9736e52cac0278a24a8b. If you boot 4.15.17 with "video.only_lcd=0" added to the kernel command line, does that make any difference? What's the output of "ls /sys/class/backlight"?
Hi, (In reply to Jeremy Cline from comment #1) > Hi, > > Thanks for the bug report. One commit that jumped out at me between 4.15.16 > and 4.15.17 is 965736ee654db8bb009a9736e52cac0278a24a8b. If you boot 4.15.17 > with "video.only_lcd=0" added to the kernel command line, does that make any > difference? Oh, good call Jeremy in case you've not seen it yet, here is a commit which should fix the regressions caused by that commit: https://patchwork.kernel.org/patch/10345845/ Perhaps we should add this to the Fedora kernel while it finds it way upstream? > What's the output of "ls /sys/class/backlight"? If "video.only_lcd=0" helps then it likely is empty without that kernel argument. Laolux can you confirm this? Regards, Hans
(In reply to Hans de Goede from comment #2) > Hi, > > (In reply to Jeremy Cline from comment #1) > > Hi, > > > > Thanks for the bug report. One commit that jumped out at me between 4.15.16 > > and 4.15.17 is 965736ee654db8bb009a9736e52cac0278a24a8b. If you boot 4.15.17 > > with "video.only_lcd=0" added to the kernel command line, does that make any > > difference? > > Oh, good call Jeremy in case you've not seen it yet, here is a commit which > should fix the regressions caused by that commit: > > https://patchwork.kernel.org/patch/10345845/ > > Perhaps we should add this to the Fedora kernel while it finds it way > upstream? Ah, I hadn't seen that, thanks! I'll see about including it with the v4.16.4 update once I sort out the build failures.
*** Bug 1570414 has been marked as a duplicate of this bug. ***
kernel-4.16.4-300.fc28 has been submitted as an update to Fedora 28. https://bodhi.fedoraproject.org/updates/FEDORA-2018-5926c0ffc8
kernel-4.16.4-200.fc27 has been submitted as an update to Fedora 27. https://bodhi.fedoraproject.org/updates/FEDORA-2018-e71875c4aa
Laolux, Oswaldo, In addition to seeing if "video.only_lcd=0" helps, can you both also test the 4.16.4 update and let us know if that works? Assuming 965736ee654db is the root cause, it should fix things for you, but there's a non-zero chance additional tweaking will be required depending on your hardware. Thanks!
Problem solved. Using 4.15.17, "ls /sys/class/backlight" outputs nothing. Adding "video.only_lcd=0" repairs the brightness adjustment with the keyboard keys for both, 4.15.17 and 4.16.3. It also changes the output of "ls /sys/class/backlight" to acpi_video0 -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/backlight/acpi_video0 acpi_video0 -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/backlight/acpi_video0 Kernel 4.16.4 completely fixes the problem, as "video.only_lcd=0" is no longer needed. Thanks a lot!
*** Bug 1571876 has been marked as a duplicate of this bug. ***
kernel-4.16.4-300.fc28 has been pushed to the Fedora 28 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-5926c0ffc8
kernel-4.16.4-100.fc26 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2018-884a105c04
kernel-4.16.4-100.fc26 has been pushed to the Fedora 26 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-884a105c04
kernel-4.16.4-200.fc27 has been pushed to the Fedora 27 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-e71875c4aa
kernel-4.16.4-300.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report.
kernel-4.16.5-100.fc26 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2018-884a105c04
kernel-4.16.4-200.fc27 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.
kernel-4.16.6-100.fc26 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2018-884a105c04
kernel-4.16.6-100.fc26 has been pushed to the Fedora 26 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-884a105c04
kernel-4.16.7-100.fc26 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2018-884a105c04
kernel-4.16.7-100.fc26 has been pushed to the Fedora 26 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-884a105c04
kernel-4.16.7-100.fc26 has been pushed to the Fedora 26 stable repository. If problems still persist, please make note of it in this bug report.