I have a ThinkPad X31 with an ATI Technologies Inc Radeon Mobility M6 LY (r100 afaik) which serves two screens, the 1024x768 internal one, and a 1280x1024 external one. Latest radeon randr-1.2 git used as the driver.
For the last one to automaticaly start at the right resolution and extend my desktop, I have an entry in my xorg.conf which looks like:
Option "RightOf" "LVDS"
Option "PreferredMode" "1280x1024"
Today I've upgraded to Xorg 7.3 (had 7.2 before, on Debian unstable) and after a restart, X freezed (what 7.2 did not), but system was still reachable via SSH, so I've killed X and restarted it again, which again gave me a freeze. I killed it once more, pulled out my external screen and started X again - it worked without problems.
After some debugging (trying older radeon driver, the latest git, different options etc) I found out, that X freezes only when PreferredMode is set, either for the internal or for the external screen.
When I remove the option I can start X without problems, but the external screen is at 1024x768 (what looks really ugly on a cheap LCD designed for 1280x1024).
However, after successful start and login, I can use "xrandr --output VGA-0 --mode 1280x1024 --right-of LVDS" to set the screen correctly up.
I will attach a Xorg.log of a freeze with latest radeon git (2fbbd9c5f0ec27e72780e8b054bc59502f1e5651) and PreferredMode set for the internal screen.
Please let me know, if I can supply any other information.
Created attachment 11623 [details]
xorg.log when freezed with preferredmode for internal screen
Can you attach the output of xrandr as well?
XRandR without PreferredMode (both screens connected):
zhenech@chiisai ~ % xrandr -q
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 2304 x 1024
VGA-0 connected 1024x768+0+0 (normal left inverted right x axis y axis) 376mm x 301mm
1280x1024 74.9 75.0 59.9 60.0
1024x768 74.9* 75.1 70.1 60.0 59.9
800x600 72.2 75.0 74.9 60.3 59.9 56.2
640x480 75.0 72.8 74.8 66.7 60.0 59.4
LVDS connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
1024x768 60.0*+ 60.0
800x600 60.0 60.3
640x480 60.0 59.9
When I set PreferredMode, start X without the monitor the PM is set for, connect the monitor afterwards and run xrandr then, X freezes too :(
can you post your xorg config as well?
It sounds like the X server enters an infinite loop when the option is present for a connected monitor. Please try attaching gdb to the X server when it's frozen and attach the backtrace.
Created attachment 11647 [details]
(In reply to comment #5)
> Please try attaching gdb to the X server when it's frozen and attach the backtrace.
Could you tell me how to do that? gdb is installed, then start X, bring it to freeze, login via SSH, and run `gdb /usr/bin/X <pid of X>`? But how do I get a backtrace as soon I'm in?
Created attachment 11669 [details]
backtrace of Xorg freezed after startup because of the PreferredMode option
this is an xserver bug.
this patch may help:
while there is still potential for an infinite loop in the server, the latest version of ati git master, should avoid the situation. see if that helps.
Hm, it seems like neither the patch for xorg, nor the latest ati git can help.
My xorg still hangs.
This should be fixed in xserver from git with Keithp's recent-ish changes to mode types.
You mean commits
Will these be in 1.4.1? *hope*
(In reply to comment #14)
> You mean commits
> feac0759522cbdc3e61ccfa373df735903c5cb27 and
> 29e0e180729a4f0cc020985a4de4c8bc4b9c7f5f ?
> Will these be in 1.4.1? *hope*
doesn't look like it. they should probably be added to the 1.4 page:
really fixed in git, patches nominated for 1.4.1