https://bugzilla.kernel.org/show_bug.cgi?id=117131 --- Comment #24 from Alex Deucher <alexdeucher@xxxxxxxxx> --- (In reply to Jason Vas Dias from comment #20) > When I look at linux 4.5.0 boot dmesg log messages like : > > [ 3.115380] vga_switcheroo: enabled > [ 3.115463] ATPX version 1, functions 0x00000033 > [ 3.115541] [drm] DMAR active, disabling use of stolen memory > > > I think 'you lie, Linux' ! The driver reads the supported ATPX functions from ACPI. So it's a bios bug. > > vga_switcheroo can never be enabled on this platform because > it has no MUX , and the logs above show the quality of the > ACPI ATPX support. > vga_switcheroo and ATPX are used on muxed and mux-less platforms to powerdown the dGPU dynamically when it's not in use. The ATPX error messages are harmless though as they are not checked anywhere. -- You are receiving this mail because: You are watching the assignee of the bug. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
