On Saturday 14 April 2018 13:17:11 Lukas Wunner wrote:
On Sat, Apr 14, 2018 at 12:49:50PM +0200, Pali Rohár wrote:
On Saturday 14 April 2018 12:45:12 Lukas Wunner wrote:
On Thu, Apr 12, 2018 at 10:15:41PM +0800, Kai-Heng Feng wrote:
Do you have any suggestion to check if it connects to the system via Thunderbolt?
Just use pci_is_thunderbolt_attached(), introduced by 8531e283bee6, like this:
if (check_dell_switchable_gfx(pci) && !pci_is_thunderbolt_attached(pci))
And what about PCI-e device attached to ExpressCard slot?
I don't know of a bullet-proof way to recognize those. In theory one could check if the PCIe port above the GPU is a non-hotplug root port, but I think there are machines with hotplug capable root ports with GPUs below them that aren't actually removable.
However I think ExpressCard-attached GPUs were rare, much less ones with integrated HDA controller, so in reality that's probably a non-issue.
Hm... maybe another idea: Is it possible to detect which audio pci device belongs to graphics card via vga_switcheroo? Currently, looking at output it is same PCI device as graphic card, just different PCI function.