<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#c20">Comment # 20</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:sylvain.pasche@gmail.com" title="Sylvain Pasche <sylvain.pasche@gmail.com>"> Sylvain Pasche</a> <pre>(In reply to Hans de Goede from <a href="show_bug.cgi?id=82634#c16">comment #16</a>) [...] > Please install this kernel and then boot into it with: > "i915.enable_backlight_control=0" (and no other backlight related options) > added to the kernel commandline, then do: > > ls /sys/class/backlight > > And you should only see acpi_video0 there, then try if backlight control > works, then suspend/resume and check if backlight control still works. Hi Hans, I really appreciate your effort in trying to find a solution for this. Unfortunately, the situation with the patch is not very promising :-( After booting with that kernel + commandline option, I see only the acpi_video0 driver indeed. However, changing the brightness has no effect (the actual screen brightness doesn't change). After suspend / resume, the backlight is off. And closing / reopening the lid doesn't bring it back on.</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>