Created attachment 23555 [details] [review] Xorg.0.log Forwarding this bug from a Ubuntu reporter: https://bugs.edge.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/318325 [Problem] After resuming from RAM, the screen flickers when the CPU load drops to a low level. [Original Report] System : Ubuntu 8.10 (up to date) GPU : ATI express X1100 Video driver : radeon Steps to reproduce : - put the computer on standby - resume from ram => the screen will flicker while CPU activity is not high workaround : - just launch an infinite loop that consume CPU : $ while true; do echo >/dev/null; done => the screen won't flicker while the CPU is use (even if only one core is being used) There isn't error either in Xorg, xsession logs or in dmesg after resuming. Notice that this trouble doesn't occur with fglrx driver. [lspci] 00:00.0 0600: 1002:5950 (rev 10) Subsystem: 1025:009f 01:05.0 0300: 1002:5975 Subsystem: 1025:009f
It's not only appears after suspend to ram but also after suspend to disk. This problem is with us for very long. I think this is high time to solve this problem. I suppose that it will be hard to reproduce this problem on other machines so I can assist in tests. I know something about programming and debugging but I have zero knowledge about graphic drivers. I can follow instructions from someone experienced. This is how screen exactly looks after suspend: http://www.youtube.com/watch?v=xuvfXgcQC94
Adding some more info at https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/560104
Is this still an issue with KMS or an newer version of the driver?
Yes this is still an issue with KMS, as explain on launchpad's bug report: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/318325
This might be fixed with 2.6.38 (assuming it's pll related) once you have chance to test such kernel please report
Just tested this with a liveCD of Natty Alpha 3 x86 on my Acer Aspire 5100 (if memory serves; it's the machine I reported on elsewhere). The problem is still there. In fact, on resume the flickering starts immediately and is more frequent than before. Looks like I'm stuck running Hardy on that machine.
Confirming, bug still present in Ubuntu Natty. Alas :-(
Original reporter hasn't advised on results since Lucid (EOL as of May 9, 2013 as per https://wiki.ubuntu.com/Releases).
Bug still exists in Ubuntu Wily.
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