https://bugs.freedesktop.org/show_bug.cgi?id=42373
Bug #: 42373 Summary: Radeon HD 6450 (NI CAICOS) screen corruption on boot Classification: Unclassified Product: DRI Version: unspecified Platform: x86-64 (AMD64) OS/Version: Linux (All) Status: NEW Severity: normal Priority: medium Component: DRM/Radeon AssignedTo: dri-devel@lists.freedesktop.org ReportedBy: kunal.gangakhedkar@gmail.com Depends on: 40935
Created attachment 52891 --> https://bugs.freedesktop.org/attachment.cgi?id=52891 dmesg log
Bought a new Radeon HD 6450 for the new desktop I was building using PhenomII X6 1075T.
Installed Kubuntu Oneiric (11.10) amd64. As soon as any FB client (e.g. plymouth splash screen) starts accessing the card after switching to KMS, the screen image gets totally corrupted.
Even Xorg/KDM fail to show anything useful. I can only reset the machine using the power button soft-off. Three-finger-salute also doesn't work.
However, it does work in about 1 out of 10 times - if somehow the apps trying to use FB device can be killed while the radeon driver is trying to work on the chip.
If KMS is disabled, the machine boots up, but Xorg fails to start saying "KMS is needed for CAICOS".
The screenshots are available at: a. KMS with plymouth splash: http://img1.UploadScreenshot.com/images/main/10/30100130871.jpg b. KMS without plymouth splash (shows init msgs with bluish tinge in the background): http://img1.UploadScreenshot.com/images/main/10/30100182712.jpg c. KMS + Xorg lockup: http://img1.UploadScreenshot.com/images/main/10/30100211337.jpg d. KMS + Xorg successful start: http://img1.UploadScreenshot.com/images/main/10/30100232928.jpg
I believe this is the same as bug #40935 - however, I haven't been able to boot into the system to test suspend/resume yet.
Finally, I used an old nVidia GeForce 7100 GS on the same system that I had lying around as a workaround.