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Re: [Qemu-devel] New usb tablet and numlock

From: Anthony Liguori
Subject: Re: [Qemu-devel] New usb tablet and numlock
Date: Thu, 20 Apr 2006 21:24:51 -0500
User-agent: Mail/News 1.5 (X11/20060309)

Chris Bagwell wrote:
Hi all,

I'm enjoying the new usb tablet device under windows 98. When the "grabless" mode is enabled, I notice that the numlock keys can get out of sync. Anyone else seeing this?

For instance, if I have numlock enabled and then start qemu with tablet support, my win98 thinks numlock is off when I move the mouse into the window (even though numlock LED is on). I have to toggle numlock off (LED off) to get the win98 host to think numlock is on.

This is probably because numlock is not sent to the guest unless you are in grab mode. You can still get into that mode by using ctrl-alt.

There's an interesting usability question here. What keys should be passed to the guest? Should alt-tab be passed? Should num-lock/caps-lock be passed? It would be pretty easy to hack up a patch that grabbed the keyboard on mouse in and released it on mouse out in grabless mode. The only question in my mind is would this be acceptable from the users perspective?


Anthony Liguori

Unrelated, I also have a general USB issue which makes me almost not use it. If I run qemu without -usb option then an idle win98 guest with linux host puts a load of about 5% on my 800Mhz processor. When I run with -usb the idle is 60% minimum. Anyone have some suggestions of were code could be optimized for idle periods?

Thanks for th great program!

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