Kernel Bug Tracker – Bug 16581
2.6.35 regression bisected : System hang when starting X with VGA/DVI monitor connected.
Last modified: 2012-08-13 15:48:05 UTC
Created attachment 27432 [details]
kernel .config file
After upgrading from 2.6.34 to 126.96.36.199 on my laptop, I'm seeing a hang and blank screen when X is started if a VGA or DVI monitor is connected to the docking station before boot. If I boot without the VGA or DVI monitor connected, and hotplug them after X is started, all is fine. Interestingly, there is no problem when both the VGA and DVI monitors are connected.
Console on radeondrmfb works all the time.
Attached you can find the kernel .config, dmesg with and without the panel attached on boot and the Xorg log on success and failure.
I've bisected the problem to the following change :
ce8f53709bf440100cb9d31b1303291551cf517f is the first bad commit
Author: Alex Deucher <email@example.com>
Date: Fri May 7 15:10:16 2010 -0400
drm/radeon/kms/pm: rework power management
- Separate dynpm and profile based power management methods. You can select the pm method
by echoing the selected method ("dynpm" or "profile") to power_method in sysfs.
- Expose basic 4 profile in profile method
"default" - default clocks
"auto" - select between low and high based on ac/dc state
"low" - DC, low power mode
"high" - AC, performance mode
The current base profile is "default", but it should switched to "auto" once we've tested
on more systems. Switching the state is a matter of echoing the requested profile to
power_profile in sysfs. The lowest power states are selected automatically when dpms turns
the monitors off in all states but default.
- Remove dynamic fence-based reclocking for the moment. We can revisit this later once we
have basic pm in.
- Move pm init/fini to modesetting path. pm is tightly coupled with display state. Make sure
display side is initialized before pm.
- Add pm suspend/resume functions to make sure pm state is properly reinitialized on resume.
- Remove dynpm module option. It's now selectable via sysfs.
Signed-off-by: Alex Deucher <firstname.lastname@example.org>
Signed-off-by: Dave Airlie <email@example.com>
:040000 040000 fa3acba12b9886453c2de619577ae633abfc97bc faf940f2c2791f1382ed1abbfa54e22df7e1c936 M drivers
Created attachment 27433 [details]
Xorg log of a working session
Created attachment 27434 [details]
Xorg log of a hanging session
Created attachment 27435 [details]
Does this patch fix the issue?
This patch fixed the issue, thank you.
Tested-by: Roel Teuwen <Roel.Teuwen@gmail.com>