Fedora Account System
Red Hat Associate
Red Hat Customer
Created attachment 923522 [details] dmesg.log +++ This bug was initially created as a clone of Bug #1126159 +++ I reported bug 1126159 for Fedora 20. I gave a try with Fedora 21, the behavior is different: By default the brightness control works well after the first boot. However, after a suspend/resume, changing the brightness has no effect and the actual brightness stays at 100%. With the default kernel parameters ls /sys/class/backlight/ acpi_video0 intel_backlight toshiba With the video.use_native_backlight=1 parameter The behavior doesn't change. Same issue as above. ls /sys/class/backlight/ acpi_video0 intel_backlight toshiba With the acpi_backlight=vendor parameter: With this parameter the brightness stays at 100% after the first boot, it behaves like after a resume for the cases above. ls /sys/class/backlight/ intel_backlight toshiba
Created attachment 923523 [details] dmi.log
Hi, Thanks for also testing with F-21, and for letting us know that things behave slightly different with F-21, however I think it is more productive to track this in a single bug (as it is likely a kernel issue, and F-20 will eventually get the new kernel from F-21 too). So I'm going to mark this as a duplicate of your earlier bug, and then get back to you in the earlier bug. Regards, Hans *** This bug has been marked as a duplicate of bug 1126159 ***