Arch Linux

mohack

Member

Registered: 2012-11-16

Posts: 13

Wrong display manager resolution

Hi!
I installed Arch with LXDE as desktop environment and LXDM as display manager (as I did on two other machines before with perfect result).
Strangely enough, on this machine the screen resolution was not set automatically to the monitor's default (I am using the xf86-video-nouveau driver for my mx440 nvidia card). But chosing "default" in LXDE for the resolution changed it successfully from 1024x768 to 1680x1050 (so the native screen resolution is recognized, if not set, automatically). But LXDM or rather its login screen still comes in 1024x768 and looks aweful.
I suspected an Xorg issue and changed the 10-monitor.conf as proposed in the Xorg Arch wiki to my desired resolution. But that does not have any effect on LXDM's login screen.
Any ideas what might be wrong? Thanks

Best

DSpider

Member

From: Romania

Registered: 2009-08-23

Posts: 2,273

Re: Wrong display manager resolution

Try enabling early start for KMS.

https://wiki.archlinux.org/index.php/KMS

Last edited by DSpider (2013-01-04 15:16:11)

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"How to Succeed with Linux"

I have made a personal commitment not to reply in topics that start with a lowercase letter. Proper grammar and punctuation is a sign of respect, and if you do not show any, you will NOT receive any help (at least not from me).

mohack

Member

Registered: 2012-11-16

Posts: 13

Re: Wrong display manager resolution

Thanks but I already did that. Now the text during boot looks nicer, but LXDM is still the same.

DarkCerberus

Banned

From: Holsworthy, Devon

Registered: 2011-12-31

Posts: 252

Re: Wrong display manager resolution

LXDM might already be at the default full screen mode - it may not even be a xorg issue. Have you however checked the LXDM configuration file at /etc/lxdm/lxdm.conf

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mohack

Member

Registered: 2012-11-16

Posts: 13

Re: Wrong display manager resolution

It is full screen alright, but at low res. If i compared it with the other computers with the same Arch setup, their login screen is at a much higher res. And when I login the resolution obviously switches to native 1680x1050 in LXDE.
I thinks it is an autodetect problem with xorg or the graphics driver. I will check the LXDM config file on monday, thx!

mohack

Member

Registered: 2012-11-16

Posts: 13

Re: Wrong display manager resolution

As far as I can see, lxdm.conf has no resolution defining parameters. I haven't changed anything there.

DSpider

Member

From: Romania

Registered: 2009-08-23

Posts: 2,273

Re: Wrong display manager resolution

Post your xorg.conf, 10-monitor.conf, or whatever.

/etc/X11/xorg.conf
/etc/X11/xorg.conf.d/10-monitor.conf

You could also try a different login manager.

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"How to Succeed with Linux"

I have made a personal commitment not to reply in topics that start with a lowercase letter. Proper grammar and punctuation is a sign of respect, and if you do not show any, you will NOT receive any help (at least not from me).

mohack

Member

Registered: 2012-11-16

Posts: 13

Re: Wrong display manager resolution

My /etc/X11/xorg.conf.d/10-monitor.conf looks like this and does not seem to have any effect:

Section "Monitor"
    Identifier             "Monitor0"
EndSection

Section "Device"
    Identifier             "Device0"
    Driver                 "nouveau" #Choose the driver used for this monitor
EndSection

Section "Screen"
    Identifier             "Screen0"  #Collapse Monitor and Device section to Screen section
    Device                 "Device0"
    Monitor                "Monitor0"
    DefaultDepth            16 #Choose the depth (16||24)
    SubSection             "Display"
        Depth               16
        Modes              "1680x1050_59.90" #Choose the resolution
    EndSubSection
EndSection

DSpider

Member

From: Romania

Registered: 2009-08-23

Posts: 2,273

Re: Wrong display manager resolution

Back up the file somewhere, then you should remove the comments (everything after the "#" symbol, including the "#" itself), and remove the pseudo-mode (the "Modes" line). You don't need it. Xorg will set your desktop to the native resolution based on your monitor's EDID information.

This is my 10-monitor.conf:

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "DELL"
    ModelName      "U2311H"
    HorizSync       30.0 - 83.0
    VertRefresh     56.0 - 76.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nouveau"
    VendorName     "NVIDIA Corporation"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Is there any reason you want 16 bit colour depth? See: https://wiki.archlinux.org/index.php/FA … a_video.3F

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"How to Succeed with Linux"

I have made a personal commitment not to reply in topics that start with a lowercase letter. Proper grammar and punctuation is a sign of respect, and if you do not show any, you will NOT receive any help (at least not from me).

welpert

Member

From: the Netherlands

Registered: 2011-01-11

Posts: 73

Re: Wrong display manager resolution

It is full screen alright, but at low res. If i compared it with the other computers with the same Arch setup, their login screen is at a much higher res. And when I login the resolution obviously switches to native 1680x1050 in LXDE.
I thinks it is an autodetect problem with xorg or the graphics driver. I will check the LXDM config file on monday, thx!

What is the output of

$ xrandr -q

?

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