Arch Linux

Please read this before reporting a bug:

Do NOT report bugs when a package is just outdated, or it is in the AUR. Use the 'flag out of date' link on the package page, or the Mailing List.

REPEAT: Do NOT report bugs for outdated packages!

FS#23744 - [kernel26] 2.6.38 kernel with Xorg from Testing breaks external monitor support.

Attached to Project: Arch Linux
Opened by Alphazo (alphazo) - Wednesday, 13 April 2011, 08:13 GMT
Last edited by Jan de Groot (JGC) - Monday, 03 October 2011, 14:00 GMT
Task Type Bug Report
Category Upstream Bugs
Status Closed
Assigned To Tobias Powalowski (tpowa)
Thomas B├Ąchler (brain0)
Architecture x86_64
Severity Low
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No


In order to get Gnome3 I enable the Testing repo but at that time I blacklisted the kernel 2.6.38 that was still in Testing too. So I was running Gnome3, 2.6.37, Xorg-Testing on my Intel GM945 video card. Everything was fine. When 2.6.38 hit Core I upgraded. From that point I could not longer switch to external monitor only. Mirror configuration works although it is weird as I don't have the same aspect ratio on the two monitors. Then if I use aRANDR, xRANDR or any other tool to switch to my external VGA monitor and disable the laptop one, I get a blank screen and I'm unable to go back to any other configuration forcing me to kill my X session. For xrandr, I use a known configuration that have been working for years on the same display.
As last resort I decided to give 2.6.39rc3 a try and then surprisingly everything works as before.
It looks like a bug in 2.6.38 considering that I get everything fine with either 2.6.37 or 2.6.39. What kind of details can I provide for the investigation?
This task depends upon

Closed by  Jan de Groot (JGC)
Monday, 03 October 2011, 14:00 GMT
Reason for closing:  No response
Additional comments about closing:  Assuming fixed. No response for several months, the initial report states that it works in a 2.6.39 RC and we're at 3.0.x now.
Comment by Isak Karlsson (dieelt) - Thursday, 14 April 2011, 06:33 GMT
I have the exact same problem. I have however _not_ enabled testing and do therfore run the Xorg from core.

$ pacman -Qv | egrep 'kernel26|xorg-server'
xorg-server-utils 7.6-2

Comment by Alphazo (alphazo) - Thursday, 14 April 2011, 07:15 GMT
I confirm that this issue is not related to Xorg/Testing bur rather to 2.6.38 kernel. I went back to 2.6.37 and everything is fine. 2.6.39rc3 is fine too.
Comment by Jelle van der Waa (jelly) - Friday, 15 April 2011, 07:44 GMT
if this is an kernel issue, you should report it upstream, (looks like one) -> but it might be fixed in .39 so reported already.
Comment by Tobias Powalowski (tpowa) - Friday, 19 August 2011, 10:49 GMT
Any update on this?
Comment by Jelle van der Waa (jelly) - Friday, 16 September 2011, 21:04 GMT
again, any update?