ubuntu-x-swat team mailing list archive

[mukesh agrawal <launchpad.net@xxxxxxxxxxxxxxxxxxx>]

Public bug reported:

Binary package hint: xserver-xorg-video-intel

I have a T410 that I want to use for a presentation. Because the built-in
LCD has a higher resolution (1440x900) than the projector, I want to
set the LCD resolution to something lower (likely 1024x768), and then
mirror its contents on the projector.

The problem I run in to is that when I set the resolution on the LCD to
1024x768, the screen contents are stretched to fit the entire screen.
Since the aspect ratios differ (4:3 for the projector, and 16:10 for the
LCD), this display is distorted on the LCD.

I've tried changing the scaling mode with xrandr, as follows:

$ xrandr --output LVDS1 --set "scaling mode" "Center"

But that does not fix the problem. While it does not report
any errors (either on the console, or in Xorg.0.log), it also
does not change how the display. This is true despite the
fact that "xrandr --prop" reports that the scaling mode has
been changed.

$ xrandr --prop
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192
VGA1 disconnected (normal left inverted right x axis y axis)
LVDS1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 304mm x 190mm
	EDID:
		00ffffffffffff0030ae364000000000
		00130103801e1378eaef259458568a29
		24505400000001010101010101010101
		0101010101018a25a02051841a303040
		360030be100000195e1fa02051841a30
		3040360030be100000190000000f0095
		0a32950a2816090030e47302000000fe
		004c503134315750332d544c413100ab
	BACKLIGHT: 13 (0x0000000d)	range:  (0,15)
	Backlight: 13 (0x0000000d)	range:  (0,15)
	scaling mode:	Center
		supported: None         Full         Center       Full aspect 
   1440x900       60.1 +   59.9     50.2  
   1360x768       59.8     60.0  
   1152x864       60.0  
   1024x768       60.0* 
   800x600        60.3     56.2  
   640x480        59.9  
HDMI1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 519mm x 324mm
	EDID:
		00ffffffffffff0010ac26a053415232
		2411010380342178ee9bb5a95434ae25
		135054a54b008180a940714fb3000101
		010101010101283c80a070b023403020
		360007442100001a000000ff00474d35
		30343739363252415320000000fc0044
		454c4c323430375746504843000000fd
		00384c1e5311000a202020202020004c
   1920x1200      60.0 +
   1600x1200      60.0  
   1680x1050      60.0  
   1280x1024      75.0     60.0  
   1152x864       75.0  
   1024x768       75.1     60.0* 
   800x600        75.0     60.3  
   640x480        75.0     60.0  
   720x400        70.1  
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
HDMI3 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)

Note that this bug report is similar to 458571, in that both
deal with scaling mode on Intel graphics. However, in that
bug report, the above command fixes the problem.

(In case the xrandr information about HDMI1 is confusing, I should
note that I'm testing this while using a large LCD as the external
display, since I don't have a projector handy.)

There are a couple of web pages [1][2] that report that this issue
might be resolved in version 2.9.1 of the Intel graphics driver.
But that seems not to be the issue here, as I'm running...

$ lsb_release -rd
Description:	Ubuntu 10.04 LTS
Release:	10.04

$ apt-cache policy  xserver-xorg-video-intel
xserver-xorg-video-intel:
  Installed: 2:2.11.0-1ubuntu1~xup
  Candidate: 2:2.11.0-1ubuntu1~xup
  Version table:
 *** 2:2.11.0-1ubuntu1~xup 0
        100 /var/lib/dpkg/status
     2:2.9.1-3ubuntu5 0
        500 http://us.archive.ubuntu.com/ubuntu/ lucid/main Packages

[1] http://ubuntuforums.org/showthread.php?t=1400943
[2] http://www.linuxquestions.org/questions/linux-software-2/aspect-ratio-scaling-with-intel-gpus-and-linux-793488/

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New

-- 
unable to change scaling mode (thinkpad t410, lucid, intel arrandale graphics)
https://bugs.launchpad.net/bugs/601370
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