On Fri, Jun 10, 2022 at 02:57:37PM -0500, Yerong Li wrote: > Hi there: > > I am using debian 11 linux with a macbook pro 2013 15-inch. i7-3740QM CPU > (NIVIDIA-GPU switch) > > I think on my macbook pro the HDMI port with external monitor is not working > while the DP port /thunderbolt 2 is working. (Actually one of my 2 DP port > is working the other is not) These three ports work under MacOS system: > > https://forums.developer.nvidia.com/t/external-monitor-not-working-nvidia-optimus/216573/2 > > Many users met similar issues: HDMI got detected by xrandr while the > external monitor got no signals. Could you help us? > > https://forums.developer.nvidia.com/t/no-signal-with-hdmi-or-dp-0-ports-on-macbookpro10-1-gt-650m-only-dp-1-works/49777/5 > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/platform/x86/apple-gmux.c#n311 I do not think this is a regression with the kernel as it never has worked before. Please contact the graphics developers so that they can help you out with this. Good luck! greg k-h
