<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_VERIFIED bz_closed" title="VERIFIED INVALID - [snb] backlight issue on TOSHIBA PORTEGE R830 after suspend/resume" href="https://bugs.freedesktop.org/show_bug.cgi?id=82634#c15">Comment # 15</a> on <a class="bz_bug_link bz_status_VERIFIED bz_closed" title="VERIFIED INVALID - [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>Hi Hans, (In reply to Hans de Goede from <a href="show_bug.cgi?id=82634#c14">comment #14</a>) > Hmm, what does "ls /sys/class/backlight" give as output with the latest F-22 > kernels without anything on the kernel commandline? And what are the problem > symptoms when not having anything on the kernel commandline ? Does > brightness control after boot work then? And what about after suspend/resume? So, with kernel 4.0.4-301.fc22.x86_64 and nothing specific on the kernel command line: After boot, these two interfaces are available: ls -l /sys/class/backlight/ lrwxrwxrwx. 1 root root 0 May 26 2015 acpi_video0 -> ../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 lrwxrwxrwx. 1 root root 0 May 26 2015 intel_backlight -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight I can change the brightness on both. After a suspend+resume: The backlight is turned on. changing brightness of acpi_video0 has no effect changing brightness of intel_backlight works > Can you also try booting without "video.use_native_backlight=1" and with: > > acpi_osi="!Windows 2012" > > on the kernel commandline? I tried that and I have the same behavior as above. Gnome 3.16 gives priority on the acpi_video0 (firmware) interface over intel_backlight (raw), so I can't change the brightness using Gnome after suspend+resume.</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>