Module Name: src Committed By: riastradh Date: Thu Dec 30 14:40:06 UTC 2021
Modified Files: src/sys/dev/acpi: acpi_display.c Log Message: acpiout(4): Work around firmware that doesn't like some brightnesses. Instead of just asking for cur - 5 or cur + 5, repeatedly ask for that increment, check whether we actually made progress in that direction, and if not keep going with another increment, until we hit the bounds of brightness levels. I can't find anything in the ACPI spec about this, but my laptop seems to have trouble with certain levels: 15, 75, 85, 95. It goes in all other increments of 5 from 5 to 100, just not those ones -- acts as if the change just never happened, so with the old logic the brightness up/down would get stuck unable to move in either direction. This should have no impact on machines where the first increment actually takes. To generate a diff of this commit: cvs rdiff -u -r1.20 -r1.21 src/sys/dev/acpi/acpi_display.c Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.