Nikita V. Youshchenko wrote:
> While trying to add xrandr support to Xvnc, I faced a bug in xrandr
> implementation in XFree 4.x; maybe current Xorg also has it?
>
> Bug is that xrandr stores the moment of last switch as 64-bit value. Then,
> in 'get configuration' request it sends this time to client as 32-bit
> value. In 'set configuration' request clents should return same value to
> the server. Idea is to check situation when other client has changed
> configuration since this client last read it.
>
> Problem is with timestamp compare in implementation of 'set configuration'
> request. It compares 64 bit values; before that, it converts 32 bit value
> got from client to 64 bit value by guessing the 'nearest' 64bit value (see
> ClentTimeToServerTime() routine).
> In practice this may result in comparison failure because of difference in
> higher word. This happens at least in two cases:
> - if enough ime (about a month) passed since last configuration (or server
> startup)
> - [much more probable] if system time went backwards at some moment (ntp?
> date -s?), X server manually increases higher word of it's server time to
> avoid server time going backwards.
>
> If this problem raises, nor xrandr -s, not krandrtray, nor any other xrandr
> client is able to switch configuration until X server restarts.
Thanks for answering. However, problem is diffrérent there: xrandr works
and krandtray does not work. The thruth is that xrandr does display the
Mhz garbled :
SZ: Pixels Physical Refresh
*0 1280 x 1024 ( 342mm x 272mm ) *-19557
1 1400 x 1050 ( 342mm x 272mm ) -19557
Current rotation - normal
Current reflection - none
Rotations possible - normal
Reflections possible - none
But at least if I do :
xrandr -S [0/1] it works and does change the resolution.
Note that it is a dual head setting with mergefb option set. When I use
the same config on single head, the MHz option are correctly displayed.
--
Eric Valette
France Telecom
Recherche & Developpement
Middleware et Plates-formes Avancées
tél : (+33) 2 99 12 45 71
mél : <mailto:[EMAIL PROTECTED]>
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