Red Hat Bugzilla – Bug 108440
XFree86 doesn't turn off LCD backlight on laptops with radeon.
Last modified: 2007-11-30 17:10:32 EST
From Bugzilla Helper: User-Agent: Mozilla/5.0 (compatible; Konqueror/3.1; Linux) Description of problem: When XFree enters 'standby' or 'off' state it doesn't turn off the LCD backlight. This bug is fixed in the XFree86 CVS, but since Fedora core is likely to ship with XFree86 4.3.0, I've made a "packport" of the fix. Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: xset dpms force off Additional info:
Created attachment 95582 [details] A patch to fix the bug. This simple patch fixes the problem.
You're correct that Fedora Core will ship 4.3.0. However, this is not a bug in 4.3.0, but rather a lack of a feature. The Radeon driver has never disabled the backlight before. It is a new feature which will be in the 4.4.0 radeon driver. I backported some stuff from CVS but intentionally removed this because it wasn't a bugfix nor minor change, but rather a new driver feature, and isn't risk free. Such a major change needs much more beta testing in order for me to feel comfortable shipping it in our X as a patch. This feature will be availalbe once 4.4.0 is released. It may eventually end up in our 4.3.0 as well, as I'd like to completely backport the entire 4.4.0 Radeon driver to 4.3.0 some day, however that is a more longer term thing, and wont be a priority. I'll defer this for now, and reopen it if I get around to backporting the driver.
Since this bugzilla report was filed, there have been several major updates to the X Window System, which may resolve this issue. Users who have experienced this problem are encouraged to upgrade to the latest version of Fedora Core, which can be obtained from: http://fedora.redhat.com/download If this issue turns out to still be reproduceable in the latest version of Fedora Core, please file a bug report in the X.Org bugzilla located at http://bugs.freedesktop.org in the "xorg" component. Once you've filed your bug report to X.Org, if you paste the new bug URL here, Red Hat will continue to track the issue in the centralized X.Org bug tracker, and will review any bug fixes that become available for consideration in future updates. Setting status to "CURRENTRELEASE".