> When you say it remains blank, do you mean the screen is totally powered > off, or do you mean the backlight comes on but it just displays a black > screen? > > I had a powered off screen when Xen panics, the screen not even blinked (--> doesn't reach the kernel or the GPU driver, the systems halts before that.
> Going from memory here, but I *think* in F29 (without Xen) the backlight > would come on, but the screen was just blank, and I could make the caps > lock light come on and hear sounds from the OS, and ctrl-alt-delete would > cause it to reboot after 60 seconds as expected. Possibly a graphics driver > problem. > > This seems to me a GPU driver issue too. In this case the logs (kernel, hypervisor, xorg) are available in the next boot for further checking. In Qubes R4.1 (F29-based) with Xen, when I resume I can hear the fans come > on, but that's it. The backlight remains powered off, the caps lock light > won't come on, sound doesn't resume playing, and I have to hold the power > button to force reboot. Sounds to me like it could be a Xen panic, although > I believe this is the same as what happened in F25, if memory serves. > > Also, I don't know what a debug card is, but my BIOS has an option called > "USB Debugging" which is enabled. Do you know anything about that, or how > to make use of it? I'm not looking to get into any serial/UART type stuff, > but USB might be an option, depending on what it does, what you need to > have, and how difficult it is. > Yes, this is what I experienced, when Xen panics. To be able to see what really happens in this case, you'd need a serial console (builtin or an add-on PCI debug card providing that serial/UART port) and configure xen to send the console output to that given serial port. With XEN cmd "loglvl=all" you'd see how far XEN gets after resume. The BIOS option "USB Debugging" for the 5575 could mean, that one of your USB ports can be used for debugging (as a serial port using USB2,ehci mode), but IMHO this would also require special cables and another PC to use as a debug console... -- You received this message because you are subscribed to the Google Groups "qubes-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to qubes-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-users/733b5e23-29c9-44db-a41a-cc41b32b20e3%40googlegroups.com.
