Public bug reported:
When running nvclock on my nVidia GeForce 6800, normally I am able to
tune the GPU and memory clock settings down slightly (a workaround for
apparently slightly off-spec hardware). Under Gentoo, there were no
problems. Under Ubuntu, as soon as I hit enter to execute the command,
my screens go haywire, showing a garbled display similar to what you'd
get if the horizontal hold were to go out on a TV. At the same time,
the machine will generally stop responding to input, thus console
switching becomes impossible. Occasionally the display may change, as
though something new appeared, and the occasional keystroke might be
accepted (at one point, an attempt to switch consoles made both screens
go black).
Eventually, it hard-locks the machine; not even Ctrl-Alt-SysRq will get
me out.
I am running nvclock as a normal user (as was the case in Gentoo), not
as root.
I suspect this is a conflict with the card/driver "PowerMizer" function
(even though mine is a normal desktop machine).
** Affects: nvclock (Ubuntu)
Importance: Undecided
Status: New
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nvclock causes corrupt screen + hard lock
https://bugs.launchpad.net/bugs/248600
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