Low resolution on external monitor using Kernel 2.6.39

ethail · 2011-06-01 13:35:45

First of all, I don't if this is the right place to post this thread because it involves a kernel from the AUR, but, as that kernel is the same version as the one from [testing] I thought it would be a good place. Furthermore, the thread involving intel cards, xorg crashings and kernel 2.6.39 convinced me.

That post: https://bbs.archlinux.org/viewtopic.php?id=119442

As user of the kernel26-pf package from AUR, yesterday I updated from 2.6.38 to 2.6.39. I'm also using an Intel card on my laptop but not suffering from the crashes that the other post, ¿maybe because I'm using KDE?. The only trouble I suffer so far is that the external screen plugged to the laptop is not detected with the resolution (1280x1024) as it was before. Instead that, it is forced to 1024x768 or lower.

I have tried forcing it by adding a new mode to xrandr, but it does not detect the full frequency that screen was being used before (59.9 from 60.0 or 75.0).

My xorg logs do not show nothing as xorg does not crash at all, and no graphic issues have been detected so far.

I have not tested yet the 2.6.39 kernel from [testing] as I'm reporting the issue when I have tested that is not some kernel config that I have broke but the version. (currently I'm downloading kernel26 from [testing] but I cannot test if the same happens before 3 hours or so, as I'm writing the post from college)

As this is the first time I report some issue like this, I'm kind of clueless what logs should I post here to be helpful.

EDIT: Quick test: In both kernels 2.6.39 from [testing] and kernel26-pf I can log into kde and do everything I do without problems, also, no touchpad broken.

EDIT2: It also does happen on kernel 2.6.39 from [testing]

Last edited by ethail (2011-06-01 15:57:11)

ethail · 2011-06-02 16:52:25

I have tried packages on testing related to xorg or intel drivers to see if that problem was still existing. It does. Doing some research I have found that this seems to be kernel related and not a driver or xorg thing and I have found no solutions.

There are all kind of troubles with intel graphic cards and i9xx drivers:

http://www.phoronix.com/scan.php?page=a … orks&num=1

Also, there is quite a "funny" discussion here:

http://forums.fedoraforum.org/showthread.php?t=263684

As it seems this is a kernel related problem, do we have more options than wait from upstream to fix this? Does anyone find any workaround?

EDIT: adding dmesg output when I plug the external monitor:

http://pastebin.com/qUAVhG7U

Last edited by ethail (2011-06-04 14:58:38)

GI Jack · 2011-07-08 15:40:02

I just hit this too after switching to kernel26-pf using XFCE4. I was using vanilla kernel 2.6.38

I'd open a program and then get a panic. never the same program.

Last edited by GI Jack (2011-07-08 15:40:51)

ethail · 2011-07-08 22:01:43

https://bugzilla.kernel.org/show_bug.cgi?id=36662

Revert the commit pointed as bad in that bug
build
???
profit

However, This bug as far as I know did not caused panics, so maybe you should start looking at other sources of trouble.

PS: to revert that commit, I use this patch: http://www.pastie.org/2185130

Last edited by ethail (2011-07-08 22:06:32)

Fackamato · 2011-07-15 23:22:36

I've the exact same issue on my T510 (Intel card, i915 I believe). I stopped using external monitors because of that, I wanted the newest kernel.

Mind you, my example above was on 2.6.39-ck on Ubuntu (Gnome), so it's most definitely upstream i915 drivers related..

ethail · 2011-07-16 10:08:53

Fackmato: you didn't bothered on reading my last post, did you?

Bug tracked AND resolved upstream. Reverted on 2.6.39.3

Fackamato · 2011-07-16 11:07:25

ethail wrote:

Fackmato: you didn't bothered on reading my last post, did you?
Bug tracked AND resolved upstream. Reverted on 2.6.39.3

I did, briefly. It didn't say "this issue has been resolved here:" so I missed it because I read through it too quickly. My bad.

You didn't bother reading my user name, did you?

Arch Linux

#1 2011-06-01 13:35:45

Low resolution on external monitor using Kernel 2.6.39

#2 2011-06-02 16:52:25

Re: Low resolution on external monitor using Kernel 2.6.39

#3 2011-07-08 15:40:02

Re: Low resolution on external monitor using Kernel 2.6.39

#4 2011-07-08 22:01:43

Re: Low resolution on external monitor using Kernel 2.6.39

#5 2011-07-15 23:22:36

Re: Low resolution on external monitor using Kernel 2.6.39

#6 2011-07-16 10:08:53

Re: Low resolution on external monitor using Kernel 2.6.39

#7 2011-07-16 11:07:25

Re: Low resolution on external monitor using Kernel 2.6.39

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