<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Laptop Backlight Issue with Hybrid Graphics System" href="https://bugs.freedesktop.org/show_bug.cgi?id=90151#c1">Comment # 1</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - Laptop Backlight Issue with Hybrid Graphics System" href="https://bugs.freedesktop.org/show_bug.cgi?id=90151">bug 90151</a> from <a class="email" href="mailto:alexdeucher@gmail.com" title="Alex Deucher <alexdeucher@gmail.com>"> Alex Deucher</a> <pre>(In reply to Kevin Sarendranath from <a href="show_bug.cgi?id=90151#c0">comment #0</a>) > > Is this an issue within the driver or from Lenovo's acpi implementation? > Please attach your xorg log and dmesg output. > If anything, I can control the backlight by using the /sys/ subsystem so I > can remap the hotkeys to control the brightness while systemd will store it > on reboot. In essence, I just wanted to bring this to attention due to the > comment in the source. > > Also a quick question on hybrid graphics, the radeon feature matrix states > that Enduro is mostly complete and I believe that this lenovo system is > muxless. Checking vgaswitcheroo, the integrated card is used while the > discrete card is "DynOff" which I presume is dynamically off. Does that mean > the driver is currently powering on the discrete card when rendering is > required? Or is something else required? By default the dGPU is powered off. It's powered on dynamically when you want to use it for rendering. See: <a href="https://wiki.archlinux.org/index.php/PRIME">https://wiki.archlinux.org/index.php/PRIME</a></pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>