<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [snb] backlight issue on TOSHIBA PORTEGE R830 after suspend/resume" href="https://bugs.freedesktop.org/show_bug.cgi?id=82634#c24">Comment # 24</a> on <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [snb] backlight issue on TOSHIBA PORTEGE R830 after suspend/resume" href="https://bugs.freedesktop.org/show_bug.cgi?id=82634">bug 82634</a> from <a class="email" href="mailto:jwrdegoede@fedoraproject.org" title="Hans de Goede <jwrdegoede@fedoraproject.org>"> Hans de Goede</a> <pre>Hi, (In reply to Sylvain Pasche from <a href="show_bug.cgi?id=82634#c23">comment #23</a>) > (In reply to Hans de Goede from <a href="show_bug.cgi?id=82634#c22">comment #22</a>) > > Sylvain, do you still have an xorg.conf file hanging around telling the > > intel ddx to use the intel_backlight interface? Can you try running the > > latest Fedora-22 kernel without such a file and without any special kernel > > commandline arguments? If that does not help then I'm afraid I'm all out of > > ideas and one of the intel devs will need to look at reg-dumps and figure > > out what exactly is going on at a much lower level. > > Hi Hans. I didn't have a xorg.conf file lying around. In fact, I also tested > with the Fedora Workstation 22 installation DVD to make sure that I have > nothing interfering. In this situation, I have the behavior described above: > * two backlight interfaces are exposed: acpi_video0 and intel_backlight > * they both work after boot > * after suspend / resume, only the intel_backlight interface works > * backlight is turned on after boot or resume Ok, so while working on some other backlight stuff my mind drifted to this bug, and I think I've a solution for it now. It is not really pretty, but hopefully I will be able to sell it to the other upstream kernel devs. But first lets see if it actually works :) I've started another Fedora-22 scratch kernel build, with another patch (which I will attach shortly): <a href="http://koji.fedoraproject.org/koji/taskinfo?taskID=9945627">http://koji.fedoraproject.org/koji/taskinfo?taskID=9945627</a> This is still building atm, but give it a try when it has finished building and let me know if that fixes things for you (I think it will). Regards, Hans</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>