Ubuntu
xserver-xorg-video-intel package

intel driver uses less than 24 bits on the laptop LCD

Bug #137149 reported by Daniel Martin
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
xserver-xorg-video-intel (Ubuntu)
Fix Released
Undecided
Unassigned

Bug Description

Binary package hint: xserver-xorg-video-intel

I have a Sony Vaio CR120E/L with Ubuntu Feisty 7.04 installed.
I noticed bands of colors (e.g. in the login screen) which indicates
xorg is using less than 24bit colors. However, when I plug in an External
LCD Monitor (without changing my xorg.conf) and restart the computer, the
image in the laptop screen remains the same as before (with color bands),
but the image on the external display is very smooth, clearly 24 bits.
I'm using kernel 2.6.22-10, but the same thing happens with version
2.6.20-16-generic.

See original description
Revision history for this message
Daniel Martin (danielmmartin) wrote :

This is my xorg.conf

description: updated
description: updated
description: updated
Revision history for this message
Domingos (ddj-ime) wrote :

Similar problem with my Toshiba A205-S4777.
3d acceleration does work, compiz is working fine.
Also replaced xserver-xorg-video-i810 with xserver-xorg-video-intel.

Revision history for this message
Chris Halse Rogers (raof) wrote :

It is entirely possible that your Laptop LCD doesn't actually have 24bpp (8 bits per channel) colour. Many LCDs, although they claim to support 24bpp colour, actually use 6 bits per channel internally. Since your external LCD doesn't display these artifacts it suggests this may be the explaination.

Just to be sure, could you please attach your /var/log/Xorg.0.log file, preferably with both internal & external LCDs on. It would also be useful if you could test under other drivers (the i810 drivers) and maybe even other operating systems, if possible.

Changed in xserver-xorg-video-intel:
assignee: nobody → raof
status: New → Incomplete
Revision history for this message
Daniel Martin (danielmmartin) wrote :

I tested my monitor under VIsta and it worked fine, meaning I was
able to see the file http://www.visi.com/~leppik/images/bit_test24.png
perfectly smooth. In linux the same image looks exactly like this:
http://www.visi.com/~leppik/images/bit_test18.png

I'm attaching my /Xorg.0.log file after booting with both the internal
and external monitors on.

Revision history for this message
Daniel Martin (danielmmartin) wrote :

With the i810 driver I get a blue screen of error.
Attached is the corresponding Xorg.0.log file.

Revision history for this message
Daniel Martin (danielmmartin) wrote :

Hello! So that you know, I upgraded to gutsy and now it works fine.

Revision history for this message
Chris Halse Rogers (raof) wrote :

Since it seems to be working for the reporter (in Gutsy), marking as fix released. Please feel free to re-open this bug if you believe that this is incorrect.

Changed in xserver-xorg-video-intel:
assignee: raof → nobody
status: Incomplete → Fix Released
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