Latest kernel messes up external monitor resolution

icetonic · 2012-08-30 09:31:10

Since the upgrade to 3.5.3 my VGA monitor is only detected as 1024x768, not as 1440x900 which it actually is and previously it was always detected correctly.

Forcing that mode with xrandr --newmode etc. does work, but it is annoying to do this after every reboot/restart of X...

I'd gladly help and give more information about my Philips monitor if someone tells me which command to use..

Last edited by icetonic (2012-08-30 09:32:18)

ralvez · 2012-08-30 23:45:32

You may want to try xdpyinfo.
Is VERY verbose but will give you good info.

Hope this helps.

R.

icetonic · 2012-08-31 10:15:32

Hmm tried xdpyinfo, but it just shows information about the virtual screen combined from both monitors connected..

Anyway, I found out my monitor is a Philips 190SW8 (19'')... well it worked with it's correct 1440x900 resolution before the latest kernel..

As this is clearly driver related... can someone file this as a bug for the kernel or something like that? That would be awesome... or at least tell me where exactly I should go with that problem.

Xräzik · 2012-08-31 21:20:42

I too am having the same problem. I am, at the moment, running the stock kernel provided by Arch (which correctly displays my monitor's resolution)

When I issue:

 sudo pacman -Qi linux

I double-check that my current kernel version is:

Name           : linux
Version         : 3.4.5-1

But the other day I used the Arch Build System to compile a custom kernel with the '3.5.3-linux-ck' patched kernel and some stripped down options (I don't need all the laptop modules). Apart from those changes, everything else in my .config file matches with my functioning kernel (checked using 'meld'). But once the graphical login starts up, I am left with an incorrect screen resolution of 1024x768 and no way to change it.

Recompiling it without the patches yields the same problem.

nomorewindows · 2012-08-31 23:48:22

linux-ck is essentially the same package as linux, but with some parameters for the scheduler.

Xräzik · 2012-09-01 00:16:45

nomorewindows wrote:

linux-ck is essentially the same package as linux, but with some parameters for the scheduler.

Yes I am aware of that.

ConnorBehan · 2012-09-01 00:25:35

If you're using a free driver (you probably are since a new one came with the kernel update) then the place to report the bug would be bugs.freedesktop.org.

Does it work if you make an xorg.conf with:

Section "Screen"
  DefaultDepth 24
  SubSection "Display"
    Depth 24
    Modes "1440x900"
  EndSubSection
EndSection

icetonic · 2012-09-01 12:36:48

ConnorBehan wrote:

If you're using a free driver (you probably are since a new one came with the kernel update) then the place to report the bug would be bugs.freedesktop.org.
Does it work if you make an xorg.conf with:
Section "Screen"
  DefaultDepth 24
  SubSection "Display"
    Depth 24
    Modes "1440x900"
  EndSubSection
EndSection

I'll try it in the next days when I'll be home again... but I guess that it will work... Isn't this basically the same effect as using xrandr to force-add a the new mode to the screen? Which, as I reported, works fine, as a workaround...

And yes I'm using the free intel driver and never needed a xorg.conf..

Arch Linux

#1 2012-08-30 09:31:10

Latest kernel messes up external monitor resolution

#2 2012-08-30 23:45:32

Re: Latest kernel messes up external monitor resolution

#3 2012-08-31 10:15:32

Re: Latest kernel messes up external monitor resolution

#4 2012-08-31 21:20:42

Re: Latest kernel messes up external monitor resolution

#5 2012-08-31 23:48:22

Re: Latest kernel messes up external monitor resolution

#6 2012-09-01 00:16:45

Re: Latest kernel messes up external monitor resolution

#7 2012-09-01 00:25:35

Re: Latest kernel messes up external monitor resolution

#8 2012-09-01 12:36:48

Re: Latest kernel messes up external monitor resolution

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