Arch Linux

Gullible Jones

Member

Registered: 2004-12-29

Posts: 4,863

Intel + KMS doesn't change resolution properly on LCDs

When I change the display resolution on my EeePC to say 800x600, instead of dithering the display and using the whole screen, X just shrinks the entire display, leaving me with big black rectangles on either side. How can I change this behavior?

PIMPinator

Member

From: Queensland, Australia

Registered: 2010-03-14

Posts: 85

Re: Intel + KMS doesn't change resolution properly on LCDs

I'm pretty sure this is to do with the EeePC hardware and not KMS, as it works fine on my MSI Wind U100. Don't quote me on that though :S

Is there a hotkey on your keyboard to change how it outputs your current display? I know my sister's EeePC has one that lets you squash 1024x768 down to fit the 1024x600 screen.

Gullible Jones

Member

Registered: 2004-12-29

Posts: 4,863

Re: Intel + KMS doesn't change resolution properly on LCDs

Hmm. As far as I can tell, my Eee does not have any such button.

stqn

Member

Registered: 2010-03-19

Posts: 1,191

Website

Re: Intel + KMS doesn't change resolution properly on LCDs

https://wiki.archlinux.org/index.php/In … aling_mode ?

Gullible Jones

Member

Registered: 2004-12-29

Posts: 4,863

Re: Intel + KMS doesn't change resolution properly on LCDs

Returns an error.

$ xrandr --output LVDS1 --set "scaling mode" full 
X Error of failed request:  BadValue (integer parameter out of range for operation)
  Major opcode of failed request:  149 (RANDR)
  Minor opcode of failed request:  13 (RRChangeOutputProperty)
  Value in failed request:  0x41
  Serial number of failed request:  29
  Current serial number in output stream:  30

Gusar

Member

Registered: 2009-08-25

Posts: 3,606

Re: Intel + KMS doesn't change resolution properly on LCDs

Check uppercase/lowercase, maybe the option is "Scaling mode" or the setting is "Full". It's important to get it correct. To see the option names, do

xrandr --props

.

Gullible Jones

Member

Registered: 2004-12-29

Posts: 4,863

Re: Intel + KMS doesn't change resolution properly on LCDs

Thank you, it was "Full".