2013/6/21 Maarten Lankhorst <[email protected]>: > Op 21-06-13 12:43, Alexander E. Patrakov schreef: >> 2013/6/21 Maarten Lankhorst <[email protected]>: >>> For the open source drivers there should be a different way to do so, try >>> running this before starting X: >>> >>> if [ -f /sys/kernel/debug/vgaswitcheroo/switch]; then >>> echo DIS > /sys/kernel/debug/vgaswitcheroo/switch >>> echo ON > /sys/kernel/debug/vgaswitcheroo/switch >>> fi >> According to https://help.ubuntu.com/community/HybridGraphics: >> >> echo DIS > /sys/kernel/debug/vgaswitcheroo/switch >> Connects discrete graphics with outputs. >> >> I assume this is for laptops that can dynamically switch their HDMI or >> other outputs from one card to another. However, this is completely >> different from what my Sony laptop provides. The cards and their >> outputs are physically separate. The Intel card is in the laptop, and >> can drive the internal panel, the VGA and the HDMI output. The Radeon >> card is in the dock station, is always on (there is no ATPX method in >> ACPI tables), works only from AC and has its own VGA and HDMI outputs, >> also located on the dock station. So this laptop, when docked, can >> drive five different displays, including the internal one. And I want >> to connect the TV to the HDMI output in the dock station because it is >> convenient (less cables attached to the side of the laptop itself). >> >> As I am physically away from this laptop, I cannot check whether >> vgaswitcheroo works (but assume it shouldn't). > Correct, but it should work on muxless too, switching will power off the > intel, which is > why you have the second line.. It will re-enable the intel, but keep radeon > as primary, > similar to what you are doing with -gpu 1.
The problem is that I have CONFIG_VGA_SWITCHEROO=y in my kernel, but no /sys/kernel/debug/vgaswitcheroo. Let me rephrase the question: would you expect this directory to exist in a desktop system with two GPUs, one onboard and one installed by yourself into a PCIe slot, but with the BIOS always insisting that the onboard one is the primary VGA? -- Alexander E. Patrakov _______________________________________________ [email protected]: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: http://lists.x.org/mailman/listinfo/xorg-devel
