[i945GM] (Needs kernel 2.6.31-6) display corruption when moving desktop windows

[Alex Pearson]

Binary package hint: xserver-xorg-video-intel

Running Ubuntu Karmic Koala Alpha 2,

Latest from ubuntu-x-swat as of 15 Jul -
including xserver-xorg-video-intel 2:2.7.99.901+git20090702.74227141-0ubuntu1 (karmic)

Running on HP nx7400 laptop, intel 945 chipset

Having installed these latest updates, have seen a new bug - on graphic movement like moving a desktop window around, the display will flicker and appear corrupt. Corruption stops when movement stops.

On the native laptop panel resolution of 1680x1050, several refresh rates are shown of 60Hz, 70Hz, 75Hz and 85Hz. This corruption does not appear at all at 85Hz refresh, but appears at all other refresh frequencies.

I tried installing the latest drivers from the xorg-edgers repository as of 14th Jul, but this driver only provided me with a 1680x1050 60Hz option which always corrupts display on movement, so I have returned to the ubuntu-x-swat repository for now, but having to run at 85Hz.

[Alex Pearson (alex-viovi)]

Please find short video of corruption uploaded to youtube here, showing display at 60hz first and corrupting during any movement, then switching to 85hz and not showing corruption.

http://www.youtube.com/watch?v=LdTjqPurPTk

(apologies for poor quality)

If you need any further logs or information let me know. Cheers

[Guido Costa (guidovb)]

Hi! I have the same problem. I've submitted a new bug #399996, already mark as duplicate ;)

[Alex Pearson (alex-viovi)]

Wow - such comprehensive log file info on #399996 - I will know how to do it for next time! :)

Just to confirm on my nx7400 HP machine, the 1360x768 resolution also works fine and is flicker free, and 1440x900 resolution does exhibit flicker, just as you have described in the duplicate report.

[Guido Costa (guidovb)]

It's not a big deal ;)

In your terminal type ubuntu-bug -p xserver-xorg-video-intel and it's done!

I was talking with Sarvatt (https://launchpad.net/~sarvatt) on IRC, he's member of the Ubuntu-X team and told me that this is a known bug in the latest kernel release and it will be fixed on 2.6.31-4 or maybe 2.6.31-5 kernel's version.

This bug hit people on certain chipsets with oddball combinations of dual channel memory running at certain speeds, but its a known problem and a fix is already out and testing.

We've to wait... :)

[Guido Costa (guidovb)]

No fix in kernel 2.6.31-5. Still waiting...

[al1321om (al1321om)]

I'm waiting too 2.6.31-5 has same problem. Intel 865. Display Corruption begins almost immediately during boot process for me. Never stops. In order to be usable in grub I select 2.6.31-2. Problem started for me w/ 2.6.31-3.

[Jacob Peddicord (jpeddicord)]

My situation is the similar to the last comment, but I don't notice any corruption until X loads (usplash appears fine). Only notice it when there is a significant amount of movement or change on the screen. Pointer motions don't cause anything, nor do clicking on buttons. GDM animations, the login, and just about everything else make the screen go crazy.

[Jacob Peddicord (jpeddicord)]

Appears to be resolved for -6. Can anyone else confirm?

[Alex Pearson (alex-viovi)]

Excellent - yes I can confirm display corruption has gone away on my laptop now I have upgraded to the 2.6.31-6 kernel.

[al1321om (al1321om)]

2.6.31-6 works for me

[zeroc (zero-c)]

i have the same problem, but since kernel 2.6.31-6 & 2.6.31-7.

2.6.31-5 works for me. its a eeepc 701 with intel 915GM chipset.