Re: [PLUG] Multimedia blues

On July 8, 2017 4:38:12 PM EDT, Charlie Li <ml+PLUG@vishwin.info> wrote:

On 08/07/17 16:25, Rich Freeman wrote:
 Are you checking for logs in a manner that would catch entries that
 were not written to disk?  If there is a kernel panic/bug/etc there
 might not be any IO to disk, and if the console was in graphics mode
 you might not see any on-screen output.
 
 If you can ssh into the box while it is otherwise hung that is a clean
 way of seeing what is going on that doesn't rely on the graphics
 drivers/etc.  Otherwise, your best bets for capturing output would be
 a serial console, or outputting via UDP:
 https://www.kernel.org/doc/Documentation/networking/netconsole.txt
 
I don't have sshd nor its systemd socket activator enabled/running
except for exactly one scenario that is not this. Further, netconsole is
impractical for me as I essentially never have access to a wired network.
 If the kernel actually panics and you have a crash kernel set up it
 might capture a core dump which you could analyze.  If it doesn't
 actually panic I suspect this would not be triggered even if your
 distro otherwise supports it.
 
The kernel doesn't panic. Maybe an oops but no panic.
 If the distro is set up to capture crash dumps you might get something
 useful by forcing a panic while it is stuck (Alt-SysRq-C if enabled).
 This command should be no worse than hitting the reset button, but
 shouldn't be used on a system you can otherwise get into.
 
The keyboard is also completely useless. Killing X doesn't work
(everything is still present on screen) and Magic SysRq won't activate.

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