https://bugzilla.kernel.org/show_bug.cgi?id=105051 Bug ID: 105051 Summary: Radeon sets max_brightness to -1, breaking GNOME backlight control on Macbook Pro mid-2015 11,5 Product: Drivers Version: 2.5 Kernel Version: 4.2.1 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@xxxxxxxxxxxxxxxxxxxx Reporter: tim.sammut@xxxxxxxxx Regression: No Created attachment 188601 --> https://bugzilla.kernel.org/attachment.cgi?id=188601&action=edit dmesg output The radeon driver appears to be setting an incorrect value of -1 for max_brightness in /sys/devices/pnp0/00:03/backlight/gmux_backlight/max_brightness. This computer is a Macbook Pro Retina mid-2015 model 11,5 without any video or acpi related kernel command line options. This prevents GNOME from correctly managing the backlight. You can see this using the following commands: $ cat /sys/devices/pnp0/00:03/backlight/gmux_backlight/max_brightness -1 $ /usr/libexec/gsd-backlight-helper --get-max-brightness Could not get the maximum value of the backlight: got invalid backlight value from /sys/devices/pnp0/00:03/backlight/gmux_backlight/max_brightness $ sudo /usr/libexec/gsd-backlight-helper --set-brightness 500 Could not get the maximum value of the backlight: got invalid backlight value from /sys/devices/pnp0/00:03/backlight/gmux_backlight/max_brightness This looks to be the same issue reported into the RedHat bugzilla at: https://bugzilla.redhat.com/show_bug.cgi?id=1263387 I've attached the dmesg from my machine. -- You are receiving this mail because: You are watching the assignee of the bug. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
