[Bug 570123] Re: Using xrandr with dual monitor causes garbled image

[Alessio Gaeta]

Il giorno gio, 29/04/2010 alle 02.01 +0000, Bryce Harrington ha
scritto: 
> Is this a regression? I.e., did it work previously on Lucid and only
> occurred after a recent update? If so, about when did you first notice
> it?

Everything was working with karmic, xorg-edgers PPA and KMS. The issue
raised after a fresh install (root formatted, fresh home) of lucid (say
beta, I think I installed it on march 26). 

> Also, try seeing if it works if KMS is disabled - see
> https://wiki.ubuntu.com/X/KernelModeSetting

Disabling KMS at boot I cannot even use the system: without external
monitor I can login, but then everything locks, apart from mouse
pointer; booting with external monitor plugged brings a black GDM (dual)
screen. In both cases I have to reboot using magic SysReq S-U-B. In
attach the Xorg.0.log and Xorg.0.log.old copied using single mode.
Nothing worth noting in kern.log.

I managed to make things work putting 'Option AGPMode "1"' in xorg.conf;
that way I can login and use the system (so maybe a new quirk in
radeon/radeon-agp.c is needed). Properly setting the virtual resolution
(2560x1024) I could use both monitors and I managed to turn upside down
the external one without garbling; changing the resolution (1280x1024 ->
800x600) caused an hardlock (mouse pointer freezed, no magic SysReq keys
working). Nothing worth noting in Xorg.0.log and kern.log.

I previously forgot to mention that with KMS I get spurious image
corruption drawing windows; a window redraw (scrolling,
app-switching, ...) solves the problem.

Thank you.



** Attachment added: "Xorg.log.noKMS.single"
   http://launchpadlibrarian.net/46202169/Xorg.log.noKMS.single

** Attachment added: "Xorg.log.noKMS.dual"
   http://launchpadlibrarian.net/46202170/Xorg.log.noKMS.dual

-- 
Using xrandr with dual monitor causes garbled image
https://bugs.launchpad.net/bugs/570123
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