On Fri, Feb 09, 2018 at 01:22:18PM +0000, Enrico Deotto wrote: > Hello, > I'm writing you to get more info about a possible bug we are experiencing on kernel 4.9 (details below). If this is not the proper address please accept my apologies and let me know where I should address my request to. > We are running Linux on a EMX-SKLUP machine (https://www.avalue.com.tw/Product/Industrial-PC/Industrial-Motherboard/Thin-Mini-ITX/EMX-SKLUP_2521 ) > This machine mounts a graphics card: Intel® Skylake U SoC integrated Graphics and we are using the i915 driver to drive two screens, one using the HDMI port and the other using the DisplayPort. > We tried different kernels and we noticed the following: > > > 1. Kernel 4.4 --> all versions work like a charm > > 2. Kernel 4.9 --> all versions before 4.9.30 work. All versions after 4.9.40 have problem with the HDMI port. It simply turns out to be always disconnected when issuing an xrandr. Thus, the screen is simply blank. The DisplayPort connection works perfectly. graphics are not a linux-serial issue, can you report this to the intel-gfx@xxxxxxxxxxxxxxxxxxxxx mailing list? The developers there should be able to help you out properly. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
