On Wed, Jul 17, 2024 at 04:35:15PM +0000, Aditya Garg wrote: > For the Macs having a single GPU, in case a person uses an eGPU, > they still need this apple-set-os quirk for hybrid graphics. I don't quite follow. You mean the integrated graphics are disabled by EFI firmware if an eGPU is attached? This sounds like a bug on Apple's part: The panel can be switched between integrated graphics and discrete graphics, but an external display can't be switched between eGPU and iGPU. Is the person affected using the latest EFI firmware update from Apple? We need more information before we can devise a way to solve the issue: - Exact model name (I'd be surprised if this affected pre-Haswell models) - Full dmesg output with command line option "dump_apple_properties" (EFI drivers provide various properties for Thunderbolt-attached devices and graphics cards, those could be queried to recognize the situation causing the issue) - Full lspci output with and without eGPU attached Perhaps you can open a bug at bugzilla.kernel.org and attach the files there. Thanks, Lukas
