https://bugs.freedesktop.org/show_bug.cgi?id=90151
Bug ID: 90151 Summary: Laptop Backlight Issue with Hybrid Graphics System Product: xorg Version: unspecified Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: normal Priority: medium Component: Driver/Radeon Assignee: xorg-driver-ati@lists.x.org Reporter: k.sarendran...@gmail.com QA Contact: xorg-t...@lists.x.org Kernel Version: 3.19.3 Radeon Version: 1:7.5.0-2 Xorg Verison: 1.17.1-5 The system being used is a Lenovo Thinkpad configured with an R7 M260DX discrete card attached to an A10-7300. Upon booting it, the kernel spits out this message: [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a backlight controller with the quirk of having the brightness hotkeys not being able to control the brightness. Looking into the radeon source, here is where the call came from (radeon_acpi.c): atif->encoder_for_bl = target; if (!target) { /* Brightness change notification is enabled, but we * didn't find a backlight controller, this should * never happen. */ DRM_ERROR("Cannot find a backlight controller\n"); } Is this an issue within the driver or from Lenovo's acpi implementation? 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? Thanks for any answers. -- You are receiving this mail because: You are the assignee for the bug.
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